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  • 1990-1994  (1,620)
  • 1980-1984
  • 1991  (1,620)
  • Analytical Chemistry and Spectroscopy  (1,511)
  • Nuclear reactions
  • pharmacokinetics
Source
Material
Years
  • 1990-1994  (1,620)
  • 1980-1984
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Distribution of mouse interferon-β in normal and brain tumour-bearing mice (1991)
    Springer
    Acta neurochirurgica 109 (1991), S. 46-51 
    Details
    ISSN: 0942-0940
    Keywords: Mouse interferon ; mouse glioma ; pharmacokinetics ; radioassay ; autoradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The distribution of125I-labelled recombinant mouse interferon-β (rMuIFN-β) in normal and glioma (203 glioma) bearing mice was studied by radioassay and macro-autoradiography at 15 and 30 min after a single intravenous injection. The level of rMuIFN-β in the spleen was about 20-fold higher than in serum. Concentrations higher than the serum level was detected in the lung, liver and kidney. The concentration of rMuIFN-β in the brain was 8% of the serum level and the concentration in the glioma 30 min after administration was about 10-fold higher than in normal mouse brain. Macro-autoradiographic study demonstrated a wide distribution range and selective uptake in glioma tissue. Furthermore, we found that mouse gliomas were sensitive to mouse IFN-β. Our findings demonstrate that in the mouse glioma model, intravenously administered interferon reaches the tumour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01405697
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  • 2
    Electronic Resource
    Electronic Resource
    Clinical pharmacokinetics and tolerability of alpidem in healthy subjects given increasing single doses (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 369-374 
    Details
    ISSN: 1432-1041
    Keywords: Alpidem ; Anxiolytics ; pharmacokinetics ; tolerance ; metabolites ; sedation ; adverse events
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary In a double-blind, placebo-controlled, crossover experiment in 21 healthy male volunteers, aged 19 to 27 y, the pharmacokinetics and tolerance of the new anxiolytic drug alpidem (SL80.0342) and its three major metabolites were studied after single doses of 25, 50, 100 and 200 mg. Plasma concentrations of alpidem (in 20 subjects) and metabolites (in 6 subjects) were measured by HPLC over a period of 54 h after dosing. Cmax, tmax and AUC(0–54) and, when possible, t1/2 were determined for alpidem and metabolites and the dose linearity of the parameters was investigated. The time to peak of alpidem was dose independent in most subjects and was short (1–4 h); the mean values at the four dosing levels were 1.9, 1.7, 1.6 and 1.8 h. The peak concentration increased with the dose, the mean values being 17, 34, 88 and 115 ng · ml−1, respectively. In 50% of the subjects cmax tended to stabilize between the 100 and 200 mg dose. Dose linearity was also present for the AUC, which plateaued between the 100 and 200 mg dose in only 3 out of 20 subjects; the mean AUC was 119, 281, 669 and 1117 ng · ml−1 · h, respectively. The apparent half-life of elimination appeared to be dose independent, mean values at the increasing dosing levels being 18.7, 19.9, 18,1 and 17.9 h. A similar relationship between the kinetics parameters and dose of the alpidem was observed for the metabolites SL83.0912, SL80.0522 and SL83.0725. The formation of metabolites was not saturated as their AUCs relative to corresponding alpidem AUCs were not dose related. Thus the kinetics of alpidem and its three major metabolites were linear after doses of 25 to 200 mg. The drug was well tolerated by most of the subjects. Sedation and dizziness occurred mainly after the 100 and 200 mg doses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314970
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  • 3
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of caffeine in patients with decompensated type I and type II diabetes mellitus (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 449-452 
    Details
    ISSN: 1432-1041
    Keywords: Diabetes mellitus ; Caffeine ; pharmacokinetics ; P-450 mono-oxygenase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Diabetes may alter the pharmacokinetics of aminopyrine and antipyrine, which are used to assess liver function. Caffeine has recently been used to test liver function, but the effect of diabetes on caffeine kinetics is not known. The kinetics of caffeine has been examined in patients with decompensated Type I and Type II diabetes and in two age- and sex-matched control groups. In both types of diabetes the apparent caffeine clearance, half-life, and apparent volume of distribution were similar to controls. It is concluded that decompensated diabetes does not influence the cytochrome P-448 mono-oxygenase system responsible for caffeine metabolism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626367
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  • 4
    Electronic Resource
    Electronic Resource
    Dopamine pharmacokinetics in critically ill newborn infants (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 593-597 
    Details
    ISSN: 1432-1041
    Keywords: Dopamine ; Newborns ; critically ill patients ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Dopamine is frequently used in critically ill newborn infants for treatment of shock and cardiac failure, but its pharmacokinetics has not been evaluated using a specific analytical method. Steady-state arterial plasma concentrations of dopamine were measured in 11 seriously ill infants receiving dopamine infusion, 5–20 μg · kg−1 · min−1, for presumed or proven sepsis and hypotensive shock. Steady-state concentrations of dopamine ranged from 0.013–0.3 μg/ml. Total body clearance averaged 115 ml · kg−1 · min−1. The apparent volume of distribution and elimination half life averaged 1.8 1 · kg−1 and 6.9 min, respectively. No relationship was observed between dopamine pharmacokinetics and gestational age, postnatal age or birthweight. Substantial interindividual variation was seen in dopamine pharmacokinetics in seriously ill infants, and plasma concentrations could not be predicted accurately from its infusion rate. Marked variation in clearance explains in part, the wide dose requirements of dopamine needed to elicit clinical response in critically ill newborn infants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00279976
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  • 5
    Electronic Resource
    Electronic Resource
    The concentration-dependent disposition and kinetics of inulin (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 619-624 
    Details
    ISSN: 1432-1041
    Keywords: Inulin ; pharmacokinetics ; half life ; distribution ; concentration-dependent clearance ; healthy subjects ; chronic renal failure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The disposition of inulin was studied in 30 healthy male and 10 healthy female volunteers, and 10 patients with stable chronic renal failure (mean creatinine clearance 45 ml·min−1) following intravenous infusion of 70 mg·kg−1 over 5 min. Plasma concentrations fell rapidly initially but the rate of decline decreased continuously over 8 h and a linear terminal elimination phase could not be identified. Inulin was excreted rapidly by the subjects with normal renal function and 97.3% of the dose was recovered in the urine in 8 h. There was a progressive highly significant fall in the renal clearance of inulin after 2 h as plasma concentrations fell below about 150 mg·l−1. Six to 8 h after administration the clearance was less than 50% of the initial value in the healthy volunteers and the corresponding fall in the renal patients was 33%. The concentration-dependent renal clearance of inulin was confirmed in “step-up” and “step-down” constant infusion studies in which clearances were measured at mean plasma concentrations ranging from 35.2 to 186.7 mg·l−1. These studies virtually excluded time, changes in posture and urine flow rate as important factors. There was no statistically significant fall in clearance during the first 2 h and kinetic analysis was based on data obtained over this time. Under these conditions the mean plasma half life, volume of distribution (Vss) and total body clearance of inulin in the healthy males, healthy females and patients with chronic renal failure were 73.2, 65.5 and 172.4 min, 10.5, 9.6 and 8.81·70 kg−1 and 113.3, 111.5 and 43.3 ml·min−1·70 kg−1 respectively. There were no sex differences in any of the kinetic variables. The mechanism of the concentration-dependent clearance of inulin is unknown but the findings are consistent with saturable renal tubular reabsorption. Care is required with the use of inulin for measurement of the glomerular filtration rate by the single injection technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00279982
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of ampicillin on mefloquine pharmacokinetics in thai males (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 631-633 
    Details
    ISSN: 1432-1041
    Keywords: Mefloquine ; ampicillin ; Thai subjects ; pharmacokinetics ; enterohepatic recycling ; drug interaction ; adverse effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The kinetics of a single oral dose of mefloquine given either alone or with ampicillin has been studied in 8 healthy Thai male volunteers. There was a significantly higher maximum whole blood mefloquine concentration after coadministration with ampicillin (1648 vs 1228 ng·ml−1), as well as a significantly reduced terminal half life (15.3 vs 17.7 days), mean residence time (20.1 vs 23.4 days) and volume of distribution at steady state (14.1 vs 19.4 l·kg−1). Although there was no significant change in the AUC from zero time to infinity, the AUC from zero time to 5 days was significantly increased by ampicillin (4.86 vs 3.27 μg·ml−1 day). These changes in mefloquine disposition after antibiotic treatment may be due both to an increase in fractional bioavailability and a reduction in the enterohepatic recycling of mefloquine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00279985
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  • 7
    Electronic Resource
    Electronic Resource
    Lack of effect of multiple dose sucralfate on the pharmacokinetics of roxatidine acetate (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 637-638 
    Details
    ISSN: 1432-1041
    Keywords: Roxatidine acetate ; sucraflate ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00279987
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  • 8
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of halofantrine and n-desbutylhalofantrine in patients with falciparum malaria following a multiple dose regimen of halofantrine (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 161-164 
    Details
    ISSN: 1432-1041
    Keywords: Halofantrine ; Malaria falciparum ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Halofantrine is a new blood schizontocidal drug used for the treatment of multidrug-resistant falciparum malaria. The pharmacokinetics of halofantrine (HAL) and its principal metabolite, N-desbutylhalofantrine (BHAL), was investigated in 6 adult male patients of Melanesian origin with uncomplicated falciparum malaria. The patients received 500 mg of halofantrine hydrochloride at times 0, 6 and 12 h (total 1.5 g). All patients responded to treatment with a mean parasite clearance time of 52.7 h and a mean fever clearance time of 33.8 h. The following kinetic parameters (mean values) were determined for HAL and BHAL, respectively: maximum plasma concentration (Cmax)=896 and 491 ng·ml−1; time to reach the Cmax (tmax)=15 and 56 h; elimination half-life (t1/2)=91 and 79 h and the mean residence time (MRT)=71 and 102 h. Based on the clinical response the plasma concentrations of HAL and BHAL were adequate for the treatment of uncomplicated falciparum malaria in the 6 patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265910
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  • 9
    Electronic Resource
    Electronic Resource
    Fosinopril pharmacokinetics and pharmacodynamics in chronic ambulatory peritoneal dialysis patients (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 165-169 
    Details
    ISSN: 1432-1041
    Keywords: Fosinopril ; fosinoprilat ; CAPD ; ACE-inhibitor ; pharmacokinetics ; pharmacodynamics ; peritoneal dialysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics and pharmacodynamics of fosinoprilat, the diacid of fosinopril sodium, a new angiotensin-converting enzyme (ACE) inhibitor, were investigated after the oral administration of 10 mg of fosinopril sodium to 6 chronic ambulatory peritoneal dialysis (CAPD) patients. The results from 1 patient are reported separately because of the presence of concomitant liver dysfunction. The mean t1/2, Cmax, tmax, and AUC values for 5 of the CAPD patients were 19.5 h, 202 ng·ml−1, 4.8 h, and 3.19 μg·h·ml−1, respectively. Values for 1 CAPD patient with liver dysfunction were t1/2 of 65.4 h, Cmax of 182 ng·ml−1, tmax of 9 h, and AUC of 18.1 μg·h·ml−1. Peritoneal clearance of fosinoprilat was negligible, ranging from 0.07 to 0.23 ml·min−1. Serum ACE activity remained significantly suppressed at 24 and 48 h after fosinopril sodium administration with mean decreases from baseline of 94.2% and 70.6%, respectively. ACE activity was suppressed to an even greater degree in the patient with liver dysfunction, remaining 97% inhibited 72 h after drug administration. Plasma renin activity (PRA) increased and plasma aldosterone concentrations decreased following drug administration. Mean arterial pressure did not change appreciably throughout the study. Dosage reductions may not be necessary in the majority of dialysis patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265911
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  • 10
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of intravenous bisoprolol in obese and non-obese volunteers (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 171-174 
    Details
    ISSN: 1432-1041
    Keywords: Bisoprolol ; pharmacokinetics ; obesity ; blood flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of a single i. v. dose of dlbisoprolol 0.16 mg·kg−1 ideal body weight has been studied in 8 obese women (mean weight 91 kg; 161% of ideal body weight) and 8 non-obese women (51 kg; 94% of ideal body weight). Compared to the controls, the obese subjects showed an increase in the total apparent volume of distribution (Vz) (182 vs 135 1) and a decrease in Vz per kg body weight (2 vs 2.7 l·kg−1). There was a negative correlation between Vz l·kg−1 and the percentage of ideal body weight (r=−0.672). Total body clearance was increased, but t1/2 and renal clearance was unchanged. It is concluded that tissue diffusion of bisoprolol in obese subjects is limited, despite its lipophilicity, possibly because of alteration in the blood flow to adipose tissue produced by bisoprolol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265912
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  • 11
    Electronic Resource
    Electronic Resource
    Steady state pharmacokinetics of hydrolysed bopindolol in young and elderly men (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 175-178 
    Details
    ISSN: 1432-1041
    Keywords: Bopindolol ; pharmacokinetics ; beta-adrenoceptor blocker ; age ; hydrolysed bopindolol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Steady-state pharmacokinetic parameters of the new, long-acting beta-adrenoceptor blocker bopindolol have been measured in 17 young and 20 elderly healthy men. The t1/2β and the AUC(0→24 h) of hydrolysed bopindolol (the active metabolite) were both increased (40% and 26%, respectively) in the elderly subjects but tmax, Cmax and CL/f were not altered. However, after adjusting the parameters to allow for the different average body weights of the two groups, Cmax and CL/f became significantly different (+29% and −30%, respectively). AUC(0→24 h) was increased by 41%. The changes of up to 41% in pharmacokinetic parameters were smaller than the alterations of 50–100% usually seen when titrating doses of antihypertensive drugs. The clinical relevance of the effects was not examined, but similar changes have been reported for other beta-blockers which did not appear to be clinically relevant and did not affect the dosage required to treat hypertension.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265913
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  • 12
    Electronic Resource
    Electronic Resource
    Dose-dependent absorption and elimination of cefadroxil in man (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 179-183 
    Details
    ISSN: 1432-1041
    Keywords: Cefadroxil ; saturable absorption ; saturable renal tubular reabsorption ; cephalexin ; competitive inhibition ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetic behaviour of cefadroxil was dose-dependent in healthy male volunteers following the oral administration of single doses of 5, 15, and 30 mg · kg−1. As the dose of cefadroxil increased from 5 to 15 and 30 mg · kg−1, the peak plasma concentrations, normalized to 5 mg · kg−1, decreased significantly from 15.1 to 10.7 and 7.6 mg·l−1, while the corresponding normalized areas under the plasma concentration-time curves from 0 to 2 h decreased significantly from 1258 to 946 and 801 min·mg·l−1. When the same subjects were given 5 mg·kg−1 of cefadroxil together with 45 mg·kg−1 of cephalexin, the absorption of cefadroxil was slowed to a similar or greater extent than with the high dose of cefadroxil. Although the absorption rate decreased as the dose increased, the systemic availability of cefadroxil was essentially complete at all doses, as judged by the 24 h urinary recoveries of the antibiotic. Kinetic analysis of the plasma concentration-time curves gave the best fit with a zero-order followed by a first-order absorption process, consistent with saturable intestinal absorption of cefadroxil. The elimination rate of cefadroxil was directly related to dose and plasma concentrations, and the clearance at the dose of 5 mg·kg−1 was significantly increased by the simultaneous administration of high-dose cephalexin. The renal clearance of cefadroxil ranged from 98 ml·min·l−1 at total plasma cephalosporin (cefadroxil + cephalexin) concentrations less than 2.5 mg·l−1 to 156 mg·l−1 at concentrations greater than 40 mg·l−1. These findings are consistent with saturable active gastrointestinal absorption and renal tubular reabsorption of cefadroxil, with competitive inhibition of both processes by cephalexin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265914
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  • 13
    Electronic Resource
    Electronic Resource
    Interaction of ORG 10172, a low molecular weight heparinoid, and digoxin in healthy volunteers (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 245-250 
    Details
    ISSN: 1432-1041
    Keywords: Org 10172 ; Digoxin ; heparinoid ; pharmacokinetics ; pharmacodynamics ; drug interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Potential pharmacokinetic and pharmacodynamic interactions between a new low molecular weight heparinoid Org 10172 (bolus injection of 3250 anti-Xa units) and digoxin (0.25 mg once daily for 8 days) were studied in 6 healthy male volunteers using an open, randomised three-way cross-over design. Digoxin produced a slight increase in clearance of anti-Xa activity from 4.3 to 4.8 ml·min−1, while plasma anti-thrombin and thrombin generation inhibiting (TGI) activity remained unchanged. Digoxin did not affect the actions of Org 10172 on the clotting tests. In the presence of Org 10172 there was a reduction in the AUC of digoxin during one dosing interval after the seventh digoxin tablet from 20 to 17 ng·ml−1·h, and a significant reduction in the average serum digoxin conentration. Since renal digoxin clearance was not significantly changed this probably might be due to a change in the non-renal clearance of digoxin. Atrio-ventricular node conduction, as measured by PR-time intervals, remained unchanged during all three treatments. In conclusion, although the pharmacokinetics of Org 10172 and digoxin were slightly changed by the combination, it is probably safe to administer Org 10172 and digoxin simultaneously. The clinical relevance of the slight decrease in plasma anti-Xa activity levels cannot yet be defined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315437
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  • 14
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of tiaprofenic acid in children after a single oral dose (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 251-253 
    Details
    ISSN: 1432-1041
    Keywords: Tiaprofenic acid ; children ; pharmacokinetics ; NSAID
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary. Twelve healthy children in three age groups anaesthetized for minor surgery were given a single oral dose of tiaprofenic acid (3 mg · kg−1) (TA). Seven blood samples and zero to 8 and 8 to 24 h urines were collected. TA concentrations in plasma and urine were measured by HPLC. No significant difference was found between the age groups in the kinetic parameters of TA and no correlation was found between these parameters and age; tmax=2.12h, Cmax=8.78mg · l−1, AUC(0→8 h) 33.9mg · h · l−1, AUC=39.3 mg · h · l−1, t1/2=2.35 h, Vz=0.319 l · kg−1, CL=0.094 l · h−1 · kg−1. Renal clearance was 14 ml · h−1. kg−1. 33% of the TA dose was recovered in the 24 h urine, 48% of which was conjugated, whereas in adults, TA is only found in urine as conjugates. The apparent plasma clearance was significantly higher (56%) than in 12 healthy adults given 1.5 mg · kg−1 TA. Volume of distribution and t1/2 did not significantly differ between children and adults. Since no relationship has been established between plasma TA and either efficacy or toxicity, a different dose regimen cannot be recommended in 3–11 year-old children from that in adults.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315438
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  • 15
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of midazolam in children: comparative study of intranasal and intravenous administration (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 355-357 
    Details
    ISSN: 1432-1041
    Keywords: Midazolam ; pharmacokinetics ; intranasal ; intravenous ; children ; bioavailability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Twelve children 1–5 y old were randomly assigned to receive midazolam 0.2 mg·kg−1 either by the intravenous (IV) or intranasal (IN) routes. After IN administration the rapid onset of absorption was observed (tmax 12 min). After both routes of administration the half-life was similar (2.2 h IN and 2.4 h IV). After IN administration the apparent plasma clearance and volume of distribution were about twice as high as after IV administration. The results are consistent with an estimated mean bioavailability of 55%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314967
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  • 16
    Electronic Resource
    Electronic Resource
    Antipyrine kinetics in undernourished diabetics (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 359-361 
    Details
    ISSN: 1432-1041
    Keywords: Diabetes ; Antipyrine ; undernutrition ; drug metabolism ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary In developing countries diabetics frequently suffer from varying grades of malnutrition. The combined effect of malnutrition and non-insulin dependent diabetes (NIDDM) on the drug metabolising enzyme system has been evaluated using antipyrine as a protodrug. All the patients were under treatment and their plasma glucose values were within normal limits. The AUC of antipyrine was similar in all the groups. Although none of the kinetic parameters was altered in normal diabetics, the clearance of antipyrine was decreased and its half life was prolonged, with an increase in volume of distribution, in undernourished diabetics compared to undernourished controls. The results indicate that diabetes per se may not influence antipyrine kinetics when the blood glucose is well under control, but in the presence of undernutrition, it significantly alters the disposition of the drug.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314968
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  • 17
    Electronic Resource
    Electronic Resource
    Lack of effect of paracetamol on the pharmacokinetics and metabolism of codeine in man (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 379-382 
    Details
    ISSN: 1432-1041
    Keywords: Codeine ; paracetamol ; codeine-6-glucuronide ; pharmacokinetics ; metabolism ; partial clearance ; drug interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Plasma and urine concentrations of codeine and its measurable metabolites were determined by HPLC in six healthy subjects after a single 30 mg oral dose of codeine either alone or after 7 doses of 1 g paracetamol 8 hourly. After codeine alone, the t1/2 (h), AUC (μmol·l−1·h) and CLR (ml·min−1) for codeine were 2.2, 0.81, and 252 respectively. These were not significantly altered by paracetamol: 2.2, 0.84, and 291 respectively. For codeine-6-glucuronide the values were 2.4, 22.0, and 29.7 respectively. These were not significantly different from those after codeine plus paracetamol: 2.4, 21.9, and 39.6. There were no significant differences between the two treatments in the apparent partial clearances (ml·min−1) of codeine to morphine (88 codeine alone, 70 codeine plus paracetamol), to norcodeine (71 codeine alone, 88 codeine plus paracetamol), and to codeine-6-glucoronide (820 codeine alone, 1022 codeine plus paracetamol). The urinary excretion of codeine-6-glucuronide, morphine, norcodeine, and codeine were not significantly different between the two treatments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314972
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  • 18
    Electronic Resource
    Electronic Resource
    Relationship between renal function and disposition of oral cefixime (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 579-583 
    Details
    ISSN: 1432-1041
    Keywords: Cefixime ; renal failure ; pharmacokinetics ; volunteers ; adverse effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of cefixime following a single oral dose of 200 mg have been investigated in 6 normal subjects and in 22 patients with various degrees of renal insufficiency. Serum and urine samples were collected between 0 and 72 h and were subjected to two methods of analysis: bioassay and HPLC. There was a linear relationship between the two sets of results from 228 samples. This result suggests that none of the metabolites, which may accumulte in uraemic patients, has antibacterial activity. In normal subjects, the peak serum level (Cmax) was 2.50 μg·ml−1 at 2.83 h (tmax); the apparent elimination half-life (t1/2) was 3.73 h; the apparent total body clearance (CL·f−1) was 154 ml·min−1, the mean renal clearance (CLR) was 39.1 ml·min−1 and the apparent fraction of the dose recovered in 24 h urine was 0.22. In uraemic patients, Cmax and tmax were slightly increased and t1/2 was increased to 12–14 h in patients with an endogenous creatinine clearance below 20 ml·min−1. The apparent volume of distribution was decreased. Apparent total and renal clearances were lower in proportion to the degree of renal insufficiency. Linear relationships were found between CL/f, CLR and creatinine clearance (CLCR). The findings suggest that the dose of cefixime needs to be reduced only in patients with severe renal failure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314988
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  • 19
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of chlormezanone in elderly patients (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 603-607 
    Details
    ISSN: 1432-1041
    Keywords: Chlormezanone ; pharmacokinetics ; elderly
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of Chlormezanone (CM) has been determined after a single oral dose of 400 mg CM in 5 young volunteers (28 y) and in 8 elderly patients (79 y). In the young subjects, CM was rapidly absorbed and distributed, and was slowly eliminated with a half-life of 38 h major metabolites were not detected in plasma or urine. Only 3% of CM was excreted unchanged in urine. In elderly patients absorption was delayed but not reduced; the Cmax and AUC did not differ from those in younger subjects, the elimination rate was reduced compared to the younger subjects (mean 54 h). The increase was in part related to the reduction in renal function and metabolism observed in aging. However, the change in pharmacokinetics was moderate and no adjustment in dosage seems necessary for treatments of limited duration in elderly patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314993
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  • 20
    Electronic Resource
    Electronic Resource
    Clinical chronopharmacology of oral sustained-release isosorbide-5-mononitrate in healthy subjects (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 71-75 
    Details
    ISSN: 1432-1041
    Keywords: Isosorbide-5-mononitrate ; sustained-release formulation ; pharmacokinetics ; cardiovascular effects ; chronopharmacology ; healthy volunteers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary In 10 healthy male subjects the pharmacokinetics and haemodynamic effects of sustained-release isosorbide-5-mononitrate 60 mg (IS-5-MN) were studied after oral administration at two different times in the day (08.00 h and 20.00 h). Effects on blood pressure and heart rate after 3 min standing upright were measured in relation to the individual circadian control values. The pharmacokinetic parameters (Cmax, tmax, AUC, t1/2) did not differ after morning and after evening dosing, tmax being 5.2 h and 4.9 h, respectively. In contrast, the cardiovascular effects of IS-5-MN were clearly circadian phase-dependent. The maximum decrease in blood pressure decrease and increase in heart rate occurred significantly earlier after the evening (BPsys 2.8 h; BPdia 2.9 h; HR 3.8 h) than after the morning dose (BPsys 5.0 h; BPdia 6.0 h; HR 5.2 h). Thus, the peak haemodynamic effects coincided with the peak drug concentration after the morning dose, whereas the peak effect was in advance of the peak drug concentration after the evening dose of IS-5-MN. The data provide evidence of circadian phase-dependency in the dose-response relationship of oral IS-5-MN.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315142
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  • 21
    Electronic Resource
    Electronic Resource
    Pitfalls of pharmacokinetic dosage guidelines in renal insufficiency (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 87-93 
    Details
    ISSN: 1432-1041
    Keywords: Pharmacotherapy ; renal insufficiency ; pharmacokinetics ; renal drug elimination ; drug monitoring ; dosage guidelines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary As the renal elimination of most drugs is closely correlated with the endogenous creatinine clearance, it is possible to use this parameter of kidney function to adjust drug dosage in renal failure. However, this simple procedure neglects possible changes in the volume of distribution, plasma protein binding, drug metabolism, intestinal absorption, and pharmacodynamics in renal insufficiency, as well as the occurrence of biologically active drug metabolities. Because of these uncertainties in critical cases the validity of the dosage calculated using the creatinine clearance should be checked by clinical surveillance and measurements of drug blood concentrations. Further, pharmacokinetic dosage guidelines based on the individual creatinine clearance may not be applicable to diuretics and drugs which have markedly differing kinetics of pharmacodynamic effects and blood levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315145
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  • 22
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of the anti-inflammatory drug ximoprofen in healthy subjects and in disease states (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 101-106 
    Details
    ISSN: 1432-1041
    Keywords: Ximoprofen ; pharmacokinetics ; normal subjects ; hepatic disease ; renal disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of ximoprofen, a potent new non-steroidal anti-inflammatory agent, has been investigated in normal healthy subjects and in patients with hepatic or renal disease. After intravenous infusion of 22.8 mg to healthy subjects, plasma ximoprofen concentrations declined in a polyexponential manner with a terminal phase half-life of 1.9 h. The systemic clearance of ximoprofen was 115 ml·min−1 and the volumes of distribution were 18.0 l Vz and 13.8 l Vss. Ximoprofen was 80–90% bound to plasma proteins. The systemic availabilities (f) of orally and rectally administered doses of 30 mg of ximoprofen were 98% and 56% respectively and, in the case of the rectal dose, absorption appeared to be prolonged leading to “flip-flop” kinetics. After single oral doses of 30 mg of ximoprofen to patients with hepatic disease, half-life (2.2 h), peak plasma concentrations (1.55 μg·ml−1 cf 1.04 μg·ml−1 in healthy subjects) and areas under the curve (6.12 μg·h·ml−1 cf 3.54 μg·h·ml−1 in healthy subjects) were significantly different from those in healthy subjects. After single oral doses of 30 mg of ximoprofen to patients with renal disease, pharmacokinetic parameters of half-life (4.0 h), mean residence time (6.0 h) and area under the curve (9.2 μg·h·ml−1) were significantly different from those in healthy subjects. There were no significant differences in pharmacokinetic parameters between patients having differing degrees of renal disease. These data nevertheless suggest that accumulation of ximoprofen in hepatic or renal disease would be of slight or negligible clinical relevance and that no alteration of the dose regimen (up to 15 mg twice daily) may be required when ximoprofen is administered in these disease states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315147
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  • 23
    Electronic Resource
    Electronic Resource
    CSF Baclofen levels after intrathecal administration in severe spasticity (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 363-365 
    Details
    ISSN: 1432-1041
    Keywords: Baclofen ; severe spasticity ; pharmacokinetics ; CSF ; intrathecal injection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetic parameters in the CSF of baclofen given to 4 patients as an intrathecal bolus are reported. Considerable inter-individual variability in the parameters was observed. The elimination half-life ranged from 0.9 to 5 h and the clearance from 0.013 to 0.08 l·h−1. In order to optimize treatment, it is suggested that CSF baclofen levels be matched to changes in Hoffman's monosynaptic reflex (H reflex).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265844
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  • 24
    Electronic Resource
    Electronic Resource
    Evaluation of proposed sulphoxidation pathways of carbocysteine in man by HPLC quantification (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 387-392 
    Details
    ISSN: 1432-1041
    Keywords: Carbocysteine ; pharmacogenetics ; drug metabolism ; sulphoxidation ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary A quantitative study has been made of the metabolism of S-carboxymethyl-L-cysteine (CMC) and its sulphoxides in volunteers by HPLC. Precolumn derivatization was applied prior to gradient reversed phase HPLC separation and fluorescence detection. For CMC and its metabolites containing a primary amino group the reagent 9-fluorenylmethylchloroformate was used. The other metabolites of CMC were derivatized at their carboxylic group with 1-pyrenyldiazomethane to give stable fluorescent products. Urine samples were collected for 8 h after oral administration of 1.125 g CMC to 33 healthy volunteers. Elimination of CMC in urine as sulphoxides did not account for more than 1% of the dose in any of the volunteers. Thus, CMC-sulphoxide metabolites are not quantitatively important. Recovery of the original substance in 8-hour urines ranged from 10 to 30% and a further 2 to 20% was recovered as the metabolite thiodiglycolic acid. Oral doses of 0.19, 1.125, and 2.25 g CMC in a second group of 12 healthy volunteers did not reveal dose dependence of the urinary excretion of the sulphoxides or of thiodiglycolic acid. Serum concentration-time-curves of CMC, (S)- and (R)-CMC sulphoxide were measured in a group of 9 healthy volunteers. The CMC sulphoxides in serum reached 1.5% of the parent substance after 4 hours. The ratio of CMC to its sulphoxide metabolites was similar in serum and urine. Pharmacogenetic polymorphism of sulphoxidation was not confirmed by the specific HPLC methods used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265849
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  • 25
    Electronic Resource
    Electronic Resource
    Interaction of metoprolol with lorazepam and bromazepam (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 405-409 
    Details
    ISSN: 1432-1041
    Keywords: Metoprolol ; lorazepam ; bromazepam ; interaction ; psychomotor tests ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The interaction between metoprolol and bromazepam and lorazepam was studied in 12 healthy male volunteers aged 21–37 years. Metoprolol had no significant effect on the pharmacokinetics of bromazepam or lorazepam. However, bromazepam AUC was 35% higher in the presence of metoprolol. Bromazepam enhanced the effect of metoprolol on systolic blood pressure but not on diastolic blood pressure or pulse rate. Lorazepam had no effect on either blood pressure or pulse. Metoprolol did not enhance the effect of bromazepam on the psychomotor tests used in this study. Metoprolol caused a small increase in critical flicker fusion threshold with lorazepam but had no effect on the other tests. Lorazepam (2 mg) was more potent than bromazepam (6 mg) in the doses used in this study. The interaction of metoprolol with bromazepam and lorazepam is unlikely to be of clinical significance. No change in dose is necessary when using these drugs together.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265852
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  • 26
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of ibuprofen in febrile children (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 427-428 
    Details
    ISSN: 1432-1041
    Keywords: Ibuprofen ; children ; fever ; pharmacokinetics ; adverse effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Ibuprofen may be an alternative to acetaminophen to control fever in children but little is known about its pharmacokinetics in pediatric patients. We studied 17 patients (age 3–10 yr) with fever; the most prevalent diagnoses were streptococcal pharyngitis and otitis media. Ibuprofen liquid was given as a single dose, 5 mg/kg (9 patients) or 10 mg/kg (8 patients). Multiple blood samples were collected over 8 hours and analyzed by HPLC. The maximum observed serum concentrations of ibuprofen ranged from 17–42 μm·ml−1 at 5 mg·kg−1 and 25–53 μm·ml−1 at 10 mg·kg−1 doses. Pharmacokinetics did not appear to be affected by ibuprofen dose. Mean tmax, oral clearance and elimination half life were 1.1 h, 1.2 ml·min−1·kg−1, and 1.6 h, respectively in patients at 5 mg·kg−1 doses; the corresponding values were 1.2 h, 1.4 ml·min−1·kg−1, and 1.6 h in those receiving 10 mg·kg−1 doses. There was no relationship between age and ibuprofen kinetics. No adverse effects occurred in any patients. These data suggest that ibuprofen pharmacokinetics may not be affected by dose between 5 and 10 mg/kg or age between 3 and 10 years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265858
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  • 27
    Electronic Resource
    Electronic Resource
    Disposition of epirubicin and metabolites with repeated courses to cancer patients (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 481-487 
    Details
    ISSN: 1432-1041
    Keywords: Epirubicin ; pharmacokinetics ; plasma concentrations ; cancer patients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Thirteen cancer patients were studied following a total of 41 courses of epirubicin (EPI) (38–50 mg·m−2, mean 49.2 mg·m−2, administered by a 60 min infusion), together with other cancer chemotherapeutic agents. The aim was to consider the disposition of EPI and metabolites following subsequent courses as it has been reported that doxorubicin (the 4′-epimer parent of EPI) clearance is increased following the first administration. We have observed that EPI-glucuronide accounted for a mean 78.0%, epirubicinol 0.2% and epirubicinol-glucuronide 19.3% and that parent EPI accounted for only 2.4% of the EPI-compounds measured (mean of all patients and courses) for the 3 h period immediately following the infusion. These data confirm the rapid metabolism of EPI and the dominance of the glucuronidation metabolite pathway (which is not available to doxorubicin) and are compared with the metabolite profile observed in other reports. Large inter- and intra-individual variability in area under the plasma concentration/time curve were observed with no clear evidence of any consistent directional trend for such fluctuations, suggesting that factors contributing to EPI disposition are multivariate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315227
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  • 28
    Electronic Resource
    Electronic Resource
    Polymorphic flecainide disposition under conditions of uncontrolled urine flow and pH (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 155-162 
    Details
    ISSN: 1432-1041
    Keywords: Flecainide ; sparteine/debrisoquine polymorphism ; metabolism ; enantiomers ; pharmacokinetics ; stereoselectivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of R- and S-flecainide have been determined in five poor (PM) and five extensive (EM) metabolisers of sparteine/debrisoquine under conditions of uncontrolled urine flow and pH. The half-lives of R- and S-flecainide in PMs (R 19.3 h; S 16.1 h) were approximately twice those observed in EMs (R 8.8 h; S 9.1 h). The apparent oral clearances of R- and S-flecainide were lower in PMs (R 313 ml·min−1; S 379 ml·min−1) than in EMs (R 783 ml·min−1; S 828 ml·min−1). The renal clearance, however, was comparable for both enantiomers in both EMs and PMs, and therefore the phenotypic differences in flecainide disposition observed must be due to differences in metabolic clearance. The nonrenal clearance of both enantiomers was significantly lower in poor (R 123 ml·min−1; S 201 ml·min−1) relative to extensive metabolisers (R 533 ml·min−1; S 586 ml·min−1). The partial clearance to the two major metabolites meta-O-dealkylated flecainide (MODF) and the meta-O-dealkylated lactam of flecainide (MODLF) was significantly lower in poor (62 ml·min−1) than extensive (267 ml·min−1) metabolisers. The impairment in flecainide metabolism in poor metabolisers of sparteine/debrisoquine has therefore been confirmed. Under conditions reflecting the clinical situation the difference in disposition between EMs and PMs would be considerable. However, it may be predicted that at standard doses concentrations greater than 1000 ng·ml−1 would not be attained in the PMs studied. The serum protein binding of R- and S-flecainide was studied in each subject and no differences between the enantiomers or the phenotypes were observed (Free fraction EM: R 0.43; S 0.42; PM R: 0.46; S: 0.46). Enantioselective disposition was noted in all PMs studied, due to a significantly lower nonrenal clearance of the R-enantiomer. In extensive metaboliser subjects, considerable interindividual variation in the enantioselective disposition of flecainide was noted, ranging from metabolism favouring either enantiomer to the absence of any selectivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280070
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  • 29
    Electronic Resource
    Electronic Resource
    The relationships between dose and concentration of tolbutamide and insulin and glucose responses in patients with non-insulin-dependent diabetes (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 163-168 
    Details
    ISSN: 1432-1041
    Keywords: Tolbutamide ; diabetes mellitus ; non-insulin dependent ; pharmacokinetics ; pharmacodynamics ; glucose ; insulin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary It is uncertain how the hypoglycaemic effect of sulphonylureas varies with drug concentration in patients with non-insulin-dependent diabetes mellitus. The interrelationship of tolbutamide dosage and concentration, and glucose and insulin concentrations were therefore examined in 54 out-patients (the observational group) and in 20 patients studied under controlled conditions (the experimental group). In the observational group, tolbutamide concentration depended significantly on the daily dose, time from dose to sampling, body weight, and age. Blood glucose and insulin concentration were related, but were independent of tolbutamide concentration. In the experimental group, peak, but not pre-dose, tolbutamide concentration, depended on dose and on body mass index. Fasting and maximum post-prandial blood glucose concentration were positively correlated with maximum tolbutamide concentration, probably because tolbutamide dosage was highest in those with the poorest response. In the subset with a fasting blood glucose concentration of less than 8 mmol·l−1, neither glucose nor insulin concentrations depended significantly on tolbutamide concentrations. Tolbutamide concentration does not directly determine hypoglycaemic response in outpatients, and therapeutic monitoring of drug concentrations would not improve the management of such patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280071
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  • 30
    Electronic Resource
    Electronic Resource
    The origin and abundances of the chemical elements revisited (1991)
    Springer
    The astronomy and astrophysics review 3 (1991), S. 1-46 
    Details
    ISSN: 1432-0754
    Keywords: Nucleosynthesis ; Nuclear reactions ; Stars: abundances ; Interstellar Medium: abundances ; Cosmology ; Galaxies: evolution of
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The basic scheme of nucleosynthesis (building of heavy elements from light ones) has held up very well since it was first proposed more than 30 years ago by E.M. Burbidge, G.R. Burbidge, A.G.W. Cameron, W.A. Fowler, and F. Hoyle. Significant advances in the intervening years include (a) observations of elemental and a few isotopic ratios in many more extrasolar-system sites, including metal-poor dwarf irregular galaxies, where very little has happened, and supernovae and their remnants, where a great deal has happened, (b) recognition of the early universe as good for making all the elements up to helium, (c) resolution of heavy element burning in stars into separate carbon, neon, oxygen, and silicon burning, with fine tuning of the resulting abundances by explosive nucleosynthesis in outgoing supernova shock waves, (d) clarification of the role of Type I supernovae, (e) concordance between elements produced in short-lived and long-lived stars with those that increased quickly and slowly over the history of the galaxy, and (f) calibration of calculations of the evolution and explosion of massive stars against the detailed observations of SN 1987A. The discussion presupposes a reader (a) with some prior knowledge of astronomy at the level of recognizing what is meant by an A star and an AGB star and (b) with at least a mild interest in how we got to where we currently are.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00873456
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  • 31
    Electronic Resource
    Electronic Resource
    Effect of duration of levodopa/decarboxylase inhibitor therapy on the pharmacokinetic handling of levodopa in elderly patients with idiopathic Parkinson's disease (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 459-462 
    Details
    ISSN: 1432-1041
    Keywords: Levodopa/decarboxylase inhibitor ; Parkinson's Disease ; pharmacokinetics ; duration of therapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary We address, from a pharmacokinetic viewpoint, the important question of why some patients with clinical idiopathic Parkinson's disease experience a fall off in benefit from levodopa maintenance therapy. Thirteen such patients, of mean age 78 y, without overt fluctuations in motor control in temporal relation to dosing with a levodopa/decarboxylase inhibitor combination, were studied. Levodopa (currently 400 to 800 mg daily) had been started at between 61 and 81 y of age, the mean duration of therapy being 54 months. Plasma concentrations of levodopa and its peripheral metabolite, 3-0-methyldopa, were measured before a morning dose of levodopa (100 mg)/carbidopa (25 mg) and at hourly intervals for 6 h after. There was a significant negative regression between duration of levodopa therapy (but not age or severity of disease) and the area under the plasma concentration/time curve (AUC) for levodopa attributed to the test dose. A significant negative regression was also seen of duration of therapy on the dose absorbed per unit distribution volume, but not on the elimination rate constant, indicating a decrease in bioavailability and/or an increase in distribution volume with duration. There was a tendency for the plasma 3-0-methyldopa concentration, standardised for daily dose, [30MD], to increase with duration of therapy. Although, the regression of duration on [30MD] did not reach statistical significance, that on the ratio, [30MD]/AUC, did so at the 0.01 level. The amount by, and time for which, the plasma levodopa concentration exceeds any critical threshold for the competitive active uptake process into the brain may thus decrease with duration of therapy. This may explain in part the limited reversal of the neurological deficit, which is more typical of later onset Parkinsonism, and, possibly, the decrement in biological half time with duration of therapy, typical of early onset disease. 3-0-Methyldopa is known to compete for active uptake with levodopa; the ratio, [30MD]/AUC, may be a measure of this competition. Intrinsic activity of neuronal uptake mechanisms, capacity of the basal ganglia for storage of dopamine, and post synaptic neuronal activity may, of course, also be determinants of clinical outcome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626369
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  • 32
    Electronic Resource
    Electronic Resource
    Elimination of flecainide as a function of urinary flow rate and pH (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 61-63 
    Details
    ISSN: 1432-1041
    Keywords: Flecainide ; dose adjustment ; urinary pH ; urinary flow rate ; renal elimination ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary In order to evaluate the influence of urinary flow rate at different pH values on the pharmacokinetics of the basic antiarrhythmic drug flecainide 7 healthy men received 50 mg flecainide under 4 different conditions: 1. acidic urine (pH 5) and a high fluid load (125 ml · h−1) 2. acidic urine (pH 5) and a low fluid load (25 ml · h−1) 3. alkaline urine (pH 8) and a high fluid load (125 ml · h−1) 4. alkaline urine (pH 8) and a low fluid load (25 ml · h−1) At acidic pH the half-life, the amount of unchanged drug in the urine (Ae), renal clearance (CLR) and area under the curve (AUC) were independent of the fluid load. At alkaline pH Ae (5.8 vs 2.6 mg) and CLR (73 vs 33 ml · min−1) were significantly affected by fluid load (high vs low), whereas half-life and AUC were not different (15.7 vs 16.0 h, 1480 vs 1540 ng · ml−1 · h). When comparing acidic and alkaline urinary pH conditions, half-life, Ae, CLR, and AUC were different. For a high fluid load the values at acidic vs alkaline pH were half-life 10.0 vs 15.7 h; Ae 15.9 vs 5.8 mg; CLR 288 vs 73 ml · min−1; AUC 976 vs 1480 ng · ml−1 · h. For a low fluid load the corresponding values at acidic vs alkaline pH were half-life 10.1 vs 16.0 h; Ae 15.9 vs 2.6 mg; CLR 267 vs 33 ml · min−1; AUC 1045 vs 1540 ng · ml−1 · h. It is concluded that urinary pH affects flecainide pharmacokinetics independently of urinary flow rate, and that a high flow enhances the elimination of flecainide only with an alkaline urine. This effect of flow rate does not appear to be of clinical relevance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280108
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  • 33
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    Electronic Resource
    Kinetics of cholinesterase inhibition by eptastigmine in man (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 83-84 
    Details
    ISSN: 1432-1041
    Keywords: Eptastigmine ; cholinesterase inhibitor ; Alzheimer's disease ; pharmacokinetics ; adverse effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280116
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  • 34
    Electronic Resource
    Electronic Resource
    Pharmacokinetic investigation of oral and IV dihydroergotamine in healthy subjects (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 597-602 
    Details
    ISSN: 1432-1041
    Keywords: Dihydroergotamine mesilate ; pharmacokinetics ; urinary excretion ; prolonged half-life ; deep compartment ; RIA ; adverse effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary A new radioimmunoassay (RIA) for the specific measurement of dihydroergotamine (DHE), sufficiently sensitive for the determination of low plasma concentrations, has been used to investigate the pharmacokinetics of unchanged DHE. In a randomized crossover trial, eight healthy male volunteers received single doses of DHE 5 mg, 10 mg and 20 mg orally and 0.1 mg and 0.5 mg intravenously. It was possible to determine plasma concentrations and urinary excretion of DHE over the following 48 h. A long terminal plasma elimination phase of unchanged DHE (half-life 15 h) was found. A similar terminal elimination half-life was also calculated from urine data. The multi-exponential decline in plasma DHE with a long terminal half-life suggests that distribution into a deep compartment contributes to the long-lasting effect of the drug. Plasma protein binding was 93%. Despite extensive tissue distribution (Vz=33 l/kg) and a high plasma clearance (CLP=2l/min), dose-independent linear pharmacokinetics was observed. The present assay was at least 20-times more specific than the polyvalent RIA used previously and appears suitable to explore the pharmacokinetics of unchanged DHE in patients on low-dose therapy. The long terminal elimination half-life of DHE only reported previously in studies using 3H-labelled drug, and considered to be due to metabolites, was also true for the parent compound. This, in addition to the sustained pharmacological activity of the 8′-hydroxy metabolite already shown, provides a further explanation for the long duration of action of DHE in animals and man.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314992
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  • 35
    Electronic Resource
    Electronic Resource
    Effect of piperine on bioavailability and pharmacokinetics of propranolol and theophylline in healthy volunteers (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 615-617 
    Details
    ISSN: 1432-1041
    Keywords: Piperine ; Propranolol ; Theophylline ; pharmacokinetics ; drug interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The effect of piperine on the bioavailability and pharmacokinetics of propranolol and theophylline has been examined in a crossover study. Six subjects in each group received a single oral dose of propranolol 40 mg or theophylline (150 mg) alone or in combination with piperine 20 mg daily for 7 days. An earlier tmax and a higher Cmax and AUC were observed in the subjects who received piperine and propranolol. It produced a higher Cmax, longer elimination half-life and a higher AUC with theophylline. In clinical practice, the enhanced systemic availability of oral propranolol and theophylline could be exploited to achieve better therapeutic control and improved patient compliance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314996
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  • 36
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    Electronic Resource
    Inhibition of ex-vivo PAF-induced platelet aggregation by the PAF-antagonist RP 48740: relationship to plasma concentrations in healthy volunteers (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 141-145 
    Details
    ISSN: 1432-1041
    Keywords: Platelet activating ; Factor RP 48740 ; platelet aggregation ; PAF-antagonist ; dose-response relationship ; adverse effects ; pharmacokinetics ; dose-response relationship
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary RP 48740, 3-(3-pyridyl)-1H,3H-pyrrolo [1,2-c] thiazole-7-carboxamide, a specific competitive PAF-receptor antagonist in vitro, was given to 29 healthy male volunteers for 7 days. Plasma drug concentrations and exvivo PAF-induced platelet aggregation were assessed on Days 1, 4, and 7. RP 48740 had linear pharmacokinetics after single and repeated doses. It caused stable inhibition of PAF-induced platelet aggregation in a dose-dependent manner. The effect disappeared within 24 h, even after 7 days of repeated doses. The effect of RP 48740 displayed a sigmoidal relation to the plasma drug concentration; I50 2.3 (0.3) mg·l−1. There were no clinical or biological adverse reactions to RP 48740 during the study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265907
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  • 37
    Electronic Resource
    Electronic Resource
    Enantioselective steady-state kinetics of unbound disopyramide and its dealkylated metabolite in man (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 481-484 
    Details
    ISSN: 1432-1041
    Keywords: Disopyramide ; pharmacokinetics ; protein binding ; enantiomers ; metabolism ; metabolite kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Disopyramide is provided as a racemic mixture of R and S enantiomers, which have different pharmacodynamic and pharmacokinetic characteristics. Five volunteers were given racemic disopyramide 100 mg and 200 mg t.d.s. in a cross-over design. Plasma and urine concentrations of disopyramide and its active metabolite monodesisopropyl-disopyramide (MND) were determined at steady state by an enantioselective HPLC method. Unbound drug in plasma was measured after ultrafiltration. There was enantioselective clearance of unbound disopyramide (0.39 l.h−1.kg−1 for R-disopyramide and 0.58 l.h−1.kg−1 for S-disopyramide after 100 mg t.d.s.). The enantioselectivity was due to differences in the metabolism of disopyramide to MND and in further non-renal clearance, and the renal clearance of disopyramide was not enantioselective. The in vivo protein binding of disopyramide, which was saturable for both enantiomers, was also enantioselective. The difference in binding of the two enantiomers was explained by a difference in apparent binding capacity rather than in apparent binding affinity. The renal clearance of S-MND was significantly higher than R-MND (0.29 and 0.19 l.h−1.kg−1, respectively, after 100 mg t.d.s.). The renal clearance of MND also showed a tendency to saturation at higher concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626374
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  • 38
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of oral salbutamol controlled-release in Asian patients with asthma (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 495-496 
    Details
    ISSN: 1432-1041
    Keywords: Asthma ; Salbutamol ; Asians ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Using a double blind, double dummy crossover design, single dose and steady state pharmacokinetics of oral controlled release (SCR) salbutamol 4 mg and 8 mg tablets b. d. has been studied in 8 Asian patients. Plasma salbutamol was measured over 12 h. In 8 patients the single dose mean Cmax was 4.2 ng·ml−1 and 7.7 ng·ml−1 after 4 and 8 mg, respectively. In 5 patients the steady state mean Cmax, Cmin and tmax were 8.1 ng·ml−1 and 4.7 ng·ml−1 and 6 h for the 4 mg tablets and 14.1 ng·ml−1 and 7.1 ng·ml−1 and 4 h for the 8 mg tablets. It is concluded that both doses of SCR show features of controlled release and that they produced a relatively constant plasma level of salbutamol in Asian patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626378
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  • 39
    Electronic Resource
    Electronic Resource
    Relation between plasma concentration and clinical efficacy after sublingual single dose apomorphine in Parkinson's disease (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 493-494 
    Details
    ISSN: 1432-1041
    Keywords: Parkinson's disease ; Apomorphine ; pharmacokinetics ; adverse effect ; on-off effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Five patients with Parkinson's disease were given a single sublingual dose of apomorphine in 3 mg tablets (2 patients received 18 mg and 3 patients took 39 mg). The therapeutic effect appeared within 33.0 min and lasted 137 min. There was a significant correlation between peak concentration, area under the curve, dose (mg/kg) and the duration of the therapeutic effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626377
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  • 40
    Electronic Resource
    Electronic Resource
    Therapeutic monitoring of cyclosporin — an update (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 273-283 
    Details
    ISSN: 1432-1041
    Keywords: Cyclosporin A ; therapeutic monitoring ; assay techniques ; pharmacokinetics ; dose-response relationships
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The success of organ transplantation is closely related to clinical use of the immunosuppressive drug cyclosporin (CsA). The dosage of CsA is complicated by the large intra- and interindividual variability in its pharmacokinetics, as well as by the narrow concentration range between insufficient immunosuppression and toxicity. Potential sources of error in the sampling procedure and the advantages and disadvantages of the available analytical methods are discussed. Traditionally, 12 or 24 hour trough concentrations of CsA are monitored. Recently, peak concentrations or estimation of AUCs by a limited sampling strategy have been tried to improve the relatively weak concentration-effect and concentration-toxicity relationships found with trough CsA concentration monitoring. Studies of the CsA concentration-effect relationships for various treatment indications are reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314952
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  • 41
    Electronic Resource
    Electronic Resource
    Verapamil in the prophylaxis of bronchial asthma (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 317-319 
    Details
    ISSN: 1432-1041
    Keywords: Asthma ; Verapamil ; histamine-induced bronchoconstriction ; calcium antagonists ; plasma levels ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary A single oral dose of verapamil 80 mg was shown significantly to inhibit histamine-induced bronchoconstriction in 8 out of 16 asthmatic subjects (maximum increase in PD20FEVHi 416%). There was still significant protection (Δ PD20FEV1Hi〉100%) in the responders 5 h after the oral dose. The relationship of the bronchoprotective effect to the plasma level of verapamil was also examined. Responders and non-responders did not differ significantly in the peak plasma level or the time course of the plasma verapamil concentration. The protective effect was not correlated with the peak plasma level of verapamil or with the baseline bronchial hyperreactivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314959
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  • 42
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of paroxetine in patients with cirrhosis (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 351-354 
    Details
    ISSN: 1432-1041
    Keywords: Paroxetine ; Cirrhosis ; pharmacokinetics ; multiple-dose study ; adverse effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary In a 14-day multiple-dose study the pharmacokinetics of paroxetine was investigated in 12 patients with alcoholic cirrhosis and in 6 subjects without liver disease. The dose of 20–30 mg paroxetine daily was adjusted to the reduction in liver function, as assessed by the galactose elimination capacity. Accordingly, all but two of the cirrhotic patients received 20 mg, while all six control subjects received 30 mg. Dose-corrected, trough drug concentration at steady state (CSS min) and dose-corrected AUC24h were significantly higher in the patients with liver diseases than in the control subjects [3.4 vs 1.5 ng · ml−1 per mg paroxetine and 89 vs 43 h (ng) · ml−1 per mg paroxetine]. The elimination t1/2 was prolonged [83 vs 36 h], but the difference was not statistically significant, and the cirrhotic patients were still able to clear almost all the paroxetine by metabolism. All but two patients with cirrhosis experienced nausea during the first two or three days after the first dose, while none of the controls had this symptom. The study showed slower elimination of paroxetine and consequently higher plasma levels in patients with cirrhosis, suggesting that in the latter the dose of paroxetine should be in the lower end of the therapeutic range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314966
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  • 43
    Electronic Resource
    Electronic Resource
    Dose-dependent pharmacokinetics of benzoic acid following oral administration of sodium benzoate to humans (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 363-368 
    Details
    ISSN: 1432-1041
    Keywords: Benzoic acid ; hippuric acid ; pharmacokinetics ; hyperammonaemia ; ureagenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Plasma concentration-time data for benzoic and hippuric acids and urinary excretion-time data for hippuric acid were analyzed simultaneously after oral doses of 40, 80 or 160 mg/kg sodium benzoate administered at least one week apart to 6 healthy subjects. The mean AUCs of benzoic acid after the doses of 80 and 160 mg/kg of sodium benzoate were 3.7- and 12.0-times greater, respectively, than after 40 mg/kg. However, the mean AUC of hippuric acid was roughly proportional to the benzoate doses. The observed data were explained by a one-compartment model with first-order rate absorption and Michaelis-Menten elimination of benzoic acid, together with a one-compartment model with first-order elimination for hippuric acid. Although the maximum rate of biotransformation of benzoic acid to hippuric acid varied between 17.2 and 28.8 mg·kg−1·h−1 among the six individuals, the mean value (23.0 mg·kg−1·h−1) was fairly close to that provided by daily maximum dose (0.5 g·kg−1·day−1) recommended in the treatment of hyperammonaemia in patients with inborn errors of ureagenesis. The individual maximum rate of metabolism can be estimated from the urinary excretion rate of hippuric acid 1.5 to 3 h after the single oral dose of 80 to 160 mg·kg−1 sodium benzoate. The justification of this concept requires further studies in patients with inborn errors of urea synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314969
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  • 44
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    Electronic Resource
    Pharmacokinetics of intramuscular nicomorphine and its metabolites in man (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 375-378 
    Details
    ISSN: 1432-1041
    Keywords: Nicomorphine ; 6-nicotinoylmorphine ; morphine ; intramuscular administration ; metabolism ; absorption ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary After i.m. injection nicomorphine is relatively slowly absorbed from the muscular depot and is found in the serum for approximately 1 h. The rate of absorption differs between patients and governs the overall pharmacokinetic profile of the compound. The relative AUCs were nicomorphine 18%, 6-nicotinoylmorphine 17%, and morphine 65%. Nicomorphine and 6-nicotinoylmorphine have significantly higher AUCs after i.m. injection than after i.v. injection, while the AUC of morphine and the total AUC show no difference between the two modes of administration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314971
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  • 45
    Electronic Resource
    Electronic Resource
    Decreased and variable systemic availability of zidovudine in patients with AIDS if administered with a meal (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 305-308 
    Details
    ISSN: 1432-1041
    Keywords: Zidovudine ; acquired immunodeficiency syndrome (AIDS) ; pharmacokinetics ; bioavailability ; food intake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The systemic availability of oral zidovudine has been studied in 13 patients with the acquired immunodeficiency syndrome (AIDS) dosed either fasting or with breakfast. The mean peak plasma concentration and AUC of zidovudine were significantly 2.8- and 1.4-times higher in fasting patients than in those treated during meal. In both conditions the mean half-life was about 1.5 h and the period of plasma zidovudine concentrations 〉1 μmol · l−1 was 2 h (NS). It is concluded that if zidovudine is taken on an empty stomach, high peak plasma concentrations and decreased variation in pharmacological parameters may be expected. Whether or not this will influence toxicity and efficacy remains to be shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315215
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  • 46
    Electronic Resource
    Electronic Resource
    Absorption of theophylline from a new theophylline controlled-release capsule (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 319-320 
    Details
    ISSN: 1432-1041
    Keywords: Theophylline ; controlled-release formulation ; absorption ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315219
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  • 47
    Electronic Resource
    Electronic Resource
    Diuretic effect and disposition of furosemide in cystic fibrosis (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 333-341 
    Details
    ISSN: 1432-1041
    Keywords: Furosemide ; cystic fibrosis ; pharmacokinetics ; diuretic effect ; baseline urine flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacodynamics and kinetics of single oral and intravenous doses of furosemide were studied in 9 patients (mean age 18.5 y) with cystic fibrosis. The diuretic effect of furosemide lasted for 6 h after oral administration and 2 h following intravenous injection of the drug. The patients with cystic fibrosis had a more pronounced diuretic response both to the oral and intravenous treatments than that reported in normals. Furosemide caused a marked decrease in urine pH for 5 h following the oral dose and between the 2nd and 3rd h after i.v. injection. The baseline nocturnal urine flow rate in 7 of the 9 patients given furosemide orally was increased by 30.6% compared to that reported in healthy subjects. The bioavailability of furosemide, its mean absorption rate and the mean plasma and urinary elimination half-lives both of the oral and the intravenous drug were similar to those reported in normal subjects. The patients with cystic fibrosis showed, however, about double normal mean total clearance after both the oral and i.v. treatments, and its renal clearance was almost half the plasma clearance. Nonrenal clearance was markedly increased in the patients, which agreed with a considerable decrease in the renal excretion of the drug. The mean apparent volume of distribution was also markedly increased compared to data in the literature. Oral furosemide resulted in a moderate increase in haematocrit and haemoglobin levels in 7 of 9 patients with cystic fibrosis and marked hypokalemia developed in 6 of the 9 patients 6 h after dosing. Pulmonary function tests performed at that time were changed in an inconsistent manner. The sweat test was significantly perturbed in those subjects, although the concentration of chloride in sweat did not fall below 60 mEq/l in any of the sweat samples tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265840
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  • 48
    Electronic Resource
    Electronic Resource
    The pharmacokinetics and pharmacodynamics of lisuride in healthy volunteers after intravenous, intramuscular, and subcutaneous injection (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 399-403 
    Details
    ISSN: 1432-1041
    Keywords: Lisuride ; pharmacokinetics ; prolactin concentrations ; healthy volunteers ; adverse effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The plasma concentration of lisuride and prolactin have been measured in twelve healthy male volunteers after IV, IM or SC injection of 25 μg lisuride hydrogen maleate as an aqueous solution. After IV administration the plasma lisuride fell in two phases with half-lives of 14 min and 1.5 h. Total clearance was 13 ml·min−1·kg−1. After IM and SC injection the plasma concentrations peaked at 12 to 15 min and the profiles were similar to that found after IV administration. The systemic availabilities were 90% and 94%, respectively. Prolactin concentrations were reduced by a maximum of 60% relative to the normal circadian rhythm after all three routes of administration. The treatments were well tolerated, the only adverse reactions reported by some of the volunteers being mild, transient dizziness, tiredness, and nausea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265851
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  • 49
    Electronic Resource
    Electronic Resource
    Disposition of oral quinine in acute falciparum malaria (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 49-52 
    Details
    ISSN: 1432-1041
    Keywords: Quinine ; pharmacokinetics ; falciparum malaria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Plasma quinine concentrations following oral quinine sulphate 10 mg salt/kg have been measured by HPLC in 15 adult Thai patients with uncomplicated falciparum malaria. In 10 of the same patients the study was repeated in convalescence. In acute malaria plasma concentrations were approximately 50% higher than in convalescence; the mean acute peak plasma quinine concentration was 8.4 mg·l−1 compared to 5.7 mg·l−1 in convalescence. There was considerable variation in the rate of drug absorption, particularly in acute malaria. The mean time to peak plasma concentration was 5.9 h in acute malaria and 3.2 h in convalescence. The apparent clearance of oral quinine (CL/f) during the illness was 1.51 ml·kg−1·min−1, which was significantly lower than in convalescence — 2.67 ml·kg−·min−1. Estimated free quinine clearance was also lower in the acute phase: 30.6 compared to 49.0 ml·kg−1·min−1 in convalescence. Mean (SD) plasma protein binding of quinine was 94.7% in acute malaria and 92.8% in convalescence. Binding was significantly correlated with the plasma concentration of α1 acid glycoprotein (r=0.5), which was significantly higher in the acute phase; 1.48 g·l−1 compared to 1.05 g·l−1 during convalescence. Oral quinine sulphate was well absorbed in uncomplicated falciparum malaria. High blood concentrations following the administration of oral quinine in acute malaria are probably related to increased plasma protein binding, lower apparent volume of distribution, and a reduction in its systemic clearance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315138
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  • 50
    Electronic Resource
    Electronic Resource
    Lack of effect of omeprazole treatment on steady-state plasma levels of metoprolol (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 61-65 
    Details
    ISSN: 1432-1041
    Keywords: Omeprazole ; substituted benzimidazole ; metoprolol ; interaction ; cytochrome P450 ; debrisoquine hydroxylase ; pharmacokinetics ; adverse effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary In a randomised double-blind crossover study, seven healthy males were concomitantly given metoprolol 100 mg o. d. as a controlled release formulation, and omeprazole 40 mg o. d. or placebo, for 8 days. Plasma levels of the R- and S-enantiomers of metoprolol were determined on the 8th day of each treatment. The subjects were also characterised by their metabolic capacity to hydroxylate debrisoquine. Concomitant omeprazole treatment had no significant influence on the steady-state plasma levels of the two enantiomers of metoprolol. All subjects were characterised by extensive debrisoquine hydroxylation, i.e. extensive metoprolol metabolism. As metoprolol is metabolised to a great extent by debrisoquine hydroxylase (IID6), it is concluded that concomitant omeprazole treatment will probably have a negligible influence on the metabolism of the relatively large number of drugs mainly metabolised by this isoenzyme of the cytochrome P450 family.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315140
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  • 51
    Electronic Resource
    Electronic Resource
    Is there a need for more precise definitions of bioavailability? (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 123-126 
    Details
    ISSN: 1432-1041
    Keywords: bioavailability definition ; health authorities ; pharmacokinetics ; drug registration Participants: L. P. Balant (Geneva, Switzerland), L. Z. Benet (San Francisco, USA), H. Blume (Eschborn, FRG), G. Bozler (Biberach, FRG), D. D. Breimer (Leiden, The Netherlands), M. Eichelbaum (Stuttgart, FRG), U. Gundert-Remy (Berlin, FRG), J. L. Hirtz (Paris, France), E. Mutschler (Frankfurt, FRG), K. K. Midha (Saskatoon, Canada), A. G. Rauws (Bilthoven, The Netherlands), W. A. Ritschel (Cincinnati, USA), L. N. Sansom (Adelaide, Australia), J. P. Skelly (Rockville, USA), and K.-O. Vollmer (Freiburg, FRG)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary After evaluation of the present definitions in a set of particular cases, it was agreed that there was no need for “more precise” definitions and that the current ones were adequate in the majority of cases. However, it was felt that the present definitions might be improved, in particular in view of the existence of non-systemically acting drugs and future “targeted drugs”. Thus, the FDA definition might be modified as follows: “Bioavailability means the rate and extent to which the active drug ingredient or therapeutic moiety from a drug product becomes available at the site of drug action or in a biological medium believed to reflect accessibility to a site of action”.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280064
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  • 52
    Electronic Resource
    Electronic Resource
    Changes in gentamicin pharmacokinetic profiles induced by mechanical ventilation (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 297-302 
    Details
    ISSN: 1432-1041
    Keywords: Gentamicin ; pharmacokinetics ; mechanical ventilation ; therapeutic dose range
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The influence of controlled mechanical ventilation (CMV) on the pharmacokinetic profile of gentamicin has been examined in 23 patients after elective open heart surgery. A parallel design was adopted in two groups of patients: 13 patients requiring CMV for at least 32 h after surgery, all of whom were able to breath spontaneously (SB) after 72 h (study group), and 10 patients who required CMV for only a brief period and who showed SB at 32 h postsurgery. Haemodynamic parameters remained stable throughout the study. Apparent volume of distribution (Vz), half-life (t1/2), total clearance (CL), peak (C max ss ) and trough (C min ss ) plasma levels at steady-state for target levels (6–8 μg/ml), were measured. In the study group significant differences between CMV and SB conditions were found in Vz (mean 0.36 and 0.25 l/kg), t1/2 (mean 3.63 and 2.90 h) and C max ss (mean 4.30 and 5.53 μg/ml) while C min ss (mean 1.06 μg·ml−1 and 0.92 μg·ml−1) did not change significantly. In contrast, the pharmacokinetics in the control group showed no differences. It appears that CMV leads to an increase in gentamicin Vz, which accounts for the fall in C max ss below the therapeutic dose range (〈5 μg/ml) recommended for gentamicin. It seems advisable to use a larger dose of gentamicin in patients receiving CMV, even before the level is assessed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315213
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  • 53
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    Electronic Resource
    Pharmacokinetics of intravenous and oral chlordesmethyldiazepam in patients on regular haemodialysis (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 65-68 
    Details
    ISSN: 1432-1041
    Keywords: Chlordesmethyldiazepam ; pharmacokinetics ; i.v./p.o. administration ; renal failure ; protein binding ; pharmacodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of a single 2 mg IV dose of chlordesmethyldiazepam has been studied in 11 patients with renal failure on regular haemodialysis and in 11 age-matched healthy controls. The kinetics was also examined after a single 2 mg oral dose in 6 of the 11 renal failure patients. After intravenous administration the kinetics of total chlordesmethyldiazepam in renal patients and controls were the same. The unbound fraction of the drug in renal patients was higher (5.5%) than in controls (2.9%). Correction for differences in protein binding revealed a reduced apparent volume of distribution (47 vs. 140 l · kg−1) and a reduced clearance (5.0 vs. 10.5 ml · min−1 · kg−1) in the patients. The systemic availability of oral chlordesmethyldiazepam was good (82%) despite a relatively slow absorption rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280109
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  • 54
    Electronic Resource
    Electronic Resource
    Response to furosemide during dehydration with and without naproxen pretreatment of kidney donors and renal transplant recipients (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 209-214 
    Details
    ISSN: 1432-1041
    Keywords: Furosemide ; renal transplant recipients ; kidney donors ; naproxen ; dehydration ; pharmacokinetics ; salt-regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The response to 40 mg furosemide p.o. in 6 healthy kidney donors and 6 renal transplant recipients with and without naproxen pretreatment has been studied. No volume replacement was given in order to study the development of tolerance. The subjects showed an average dehydration of 1.5 kg · 6 h−1. While mean creatinine clearance was equal in patients and donors (76 vs 80 ml/min), renal furosemide clearance was significantly lower in the patients (47 vs 81 ml/min; P〈0.05). The patients also excreted a smaller fraction of the dose in the urine (5.7 vs 7.8 mg/6 h; P〈0.05). As the overall renal sensitivity was similar in the two groups, the natriuretic response was correspondingly smaller in transplant recipients as compared to donors. Within the observation period of 6 h after dosing, acute tolerance developed in the donors and in 4 of the 6 patients, as shown by clockwise hysteresis in the dose (urine furosemide excretion rate)-response (natriuresis) curves. Pretreatment with naproxen reduced renal sensitivity to furosemide (right shift of the dose response curve) in all the donors but in only 2 of the patients. In both groups acute tolerance was less pronounced after naproxen, which may indicate involvement of the prostaglandin system in the development of acute tolerance. The results may also indicate regeneration of sympathetic nerves with functional capacity in at least some renal transplants, or that other mechanisms of salt regulation compensate for loss of sympathetic nerve activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315197
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  • 55
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    Electronic Resource
    Monitoring of the free concentration of cyclosporine in plasma in man (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 571-575 
    Details
    ISSN: 1432-1041
    Keywords: Cyclosporine ; free drug in plasma ; therapeutic drug monitoring ; renal transplantation ; plasma binding ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The free fraction of cyclosporine A (CsA) and its total plasma concentration as determined by HPLC(CsAT) were prospectively monitored in 66 recipients of renal transplants. The free CsA levels (CsAu) were calculated. The variability in free CsA levels was no less than for total CsAT levels. The correlation between CsAu and CsAT was high (r=0.90). Both CsAT and CsAu covaried with serum triglycerides and apolipoprotein A1. Fourty-four of the 66 patients suffered acute rejection episodes on 69 occasions. CsAT and CSAu both decreased and to a similar extent at the occurrence of acute rejection (42% and 59% decrease, respectively; significant vs baseline. Notsignificant difference in decrease in CsATvsCsAu). Acute nephrotoxicity occurred on 11 occasions in 10 patients. Both CsAT and CSAu were approximately twice as high at the time of acute nephrotoxicity as compared to one week previously. Both CsAT and CsAu were higher during the first month after transplantation in patients with than in patients without systemic infection. Thus, plasma CsAu gave no additional clinical information or guidance compared to CsAT in renal transplant recipients. Due to the complexity of its assay, which requires two consecutive analyses, there does not appear to be any need for routine monitoring of CsAu in renal transplant recipients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00279972
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    Flecainide: evidence of non-linear kinetics (1991)
    Springer
    European journal of clinical pharmacology 41 (1991), S. 57-59 
    Details
    ISSN: 1432-1041
    Keywords: Flecainide ; pharmacokinetics ; ventricular arrhythmias
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of flecainide has been studied in 12 patients with ventricular arrhythmias, both after single administration and during chronic treatment. Both the half-life and the AUC were significantly increased during chronic treatment. This suggests that the kinetics of flecainide might be non-linear also in patients with normal kidney and liver function. The increase in plasma flecainide levels during chronic treatment could not be predicted, so close monitoring of its plasma levels is advisable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280107
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  • 57
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    Electronic Resource
    Pharmacokinetic profile and tolerability of pimobendan in patients with terminal renal insufficiency (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 107-111 
    Details
    ISSN: 1432-1041
    Keywords: Pimobendan ; pharmacokinetics ; tolerability ; renal impairment ; adverse effects ; haemodynamic actions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of an i.v. bolus of pimobendan (P) 2.5 mg and 5.0 mg, its tolerability and the effect on heart rate and blood pressure have been studied in 12 subjects (42–70 y) suffering from severe terminal renal impairment. Plasma level data were compared with those obtained in a previous investigation in healthy volunteers. Pharmacokinetics were dose linear and were comparable to those in healthy subjects. No adjustment of the dose of P is necessary in patients with severe renal impairment. Tolerability of P, observed by means of blood pressure monitoring, clinical chemistry tests, electrocardiography and subjective judgement resulted in 4 complaints out of 12 patients: three suffered from orthostatic problems and vomiting, and one patient had nausea. Mean heart rate was elevated by 19% (2.5 mg) and 16% (5.0 mg). Blood pressure was significantly reduced after 2.5 mg P (23% systolic and 26% diastolic pressure), and after 5.0 mg P by 25% systolic and 23% diastolic pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315148
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    Clinical pharmacokinetics of 3-day continuous infusion cisplatin and daily bolus 5-Fluorouracil (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 115-117 
    Details
    ISSN: 1432-1041
    Keywords: Cisplatin ; 5-Fluorouracil ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315150
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  • 59
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    Continuous infusion of high-dose metoclopramide: comparison of pharmacokinetically adjusted and standard doses for the control of cisplatin-induced acute emesis (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 283-286 
    Details
    ISSN: 1432-1041
    Keywords: Metoclopramide cancer chemotherapy ; emesis ; continuous infusion ; pharmacokinetics ; cisplatin ; adverse effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Metoclopramide was administered by continuous infusion to two groups each of 14 patients on chemotherapy, randomized to receive either doses adjusted to individual pharmacokinetic parameters or doses adjusted as usual to body weight. The mean plasma concentration at the end of the infusion in the adjusted group was 1.01 mg · 1−1, close to that aimed for (1.20 mg · 1−1). It was significantly different from that in the other group, v0.54 mg · 1−1. Antiemetic efficacy, defined as ⩽2 emetic events in the 24 h following cisplatin, was similar in both groups (being found in 12/14 (86%) and 10/14 patients (71%), respectively). Analysis of the cumulative percentage of responders according to plasma concentration showed a clear plasma concentration-effect relationship. Routine MCP pharmacokinetic dosage adjustment is not indicated, but this therapeutic approach can be used to optimize antiemetic therapy in poor responder patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315210
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  • 60
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    Electronic Resource
    Cyclosporine pharmacokinetics in liver transplant recipients: evaluation of results using both polyclonal radioimmunoassay and liquid chromatographic analysis (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 513-519 
    Details
    ISSN: 1432-1041
    Keywords: Cyclosporine ; liver transplant recipients ; radioimmunoassay ; pharmacokinetics ; bioavailability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Pharmacokinetic variables were derived from cyclosporine measurements using liquid chromatography (HPLC) and radioimmunoassay with a non-selective polyclonal antibody (PARIA) in 11 orthotopic liver transplant recipients studied in paired oral and intravenous studies both before and after permanent clamping of the biliary T-tube. After oral drug administration, mean areas under blood cyclosporine concentration versus time curves before clamping were around 5.2-fold greater by PARIA than HPLC but 2.9-fold greater after clamping and closer to comparable values after intravenous cyclosporine (2.5 and 2.3-fold, respectively). Cyclosporine clearance was smaller by PARIA than HPLC (mean 7.3 versus 3.3 ml · min−1 · kg−1, respectively, before clamping). Both values decreased by 25% after clamping (to 5.5 and 2.4 ml · min−1 · kg−1, respectively), although there was no significant change in distribution or elimination half-lives (around 0.5 and 8 h, respectively). The mean bioavailability of oral cyclosporine increased significantly after clamping in 9 patients (from 10.6% to 28.1% by HPLC and from 14.8 to 35.1% by PARIA) but in two patients who developed the vanishing bile duct syndrome values fell to 〈 10% and the proportional overestimation of cyclosporine concentrations by PARIA increased. Clamping had no significant effect on the mean apparent volumes of distribution but values of Vz were approximately twice those of Vss (around 2.6 and 1.3 l · kg−1 by PARIA and HPLC respectively). Mean half lives after clamping were shorter following oral than intravenous cyclosporine (t1/2λ2 around 15 h enterally versus 8 h parenterally). These data suggest delays in cyclosporine absorption and significant first pass metabolism which may contribute to higher PARIA:HPLC ratios after oral dosing and to reduced bioavailability before clamping.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315232
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  • 61
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    Electronic Resource
    Single-dose and steady-state kinetics of morphine and its metabolites in cancer patients — a comparison of two oral formulations (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 585-591 
    Details
    ISSN: 1432-1041
    Keywords: Morphine ; metabolites ; clinical trial ; pharmacokinetics ; controlled release formulation ; cancer patients ; adverse effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The single-dose and steady state kinetics of morphine given as controlled-release tablets (30 mg every 12 h) and as a solution (15 mg every 6 h) have been compared in 11 cancer patients with chronic pain. The concentrations of morphine, morphine-3-glucuronide (M3G), and morphine-6-glucuronide (M6G) were analyzed by HPLC. There were no significant differences between the tablets and solution in the mean steady state concentrations of morphine, M3G or M6G. The tmax was 3.3 h for the tablets compared to 1.1 h for the solution. After giving the controlled-release tablets every 12 h there was a significantly higher fluctuation index of the morphine concentrations than after the solution. Urinary recovery at steady state was comparable between the two preparations, with averages of 57% and 47%, respectively. Thus, no major differences were found in the pharmacokinetics of morphine and its glucuronidated metabolites after 30 mg morphine as controlled-release tablets every 12 h or 15 mg of morphine solution every 6 h, except for a significantly longer tmax and greater fluctuation in morphine concentrations after the controlled-release tablets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00279975
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  • 62
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    Sublingual captopril — a pharmacokinetic and pharmacodynamic evaluation (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 393-398 
    Details
    ISSN: 1432-1041
    Keywords: Captopril ; sublingual ; pharmacokinetics ; pharmacodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary In this study we compared the pharmacokinetics and pharmacodynamics of captopril after sublingual and peroral administration. Single 25 mg doses of captopril were administered sublingually and perorally on two different occasions in a randomised cross-over fashion to eight healthy volunteers aged 22–35 years. The kinetics of unchanged captopril, plasma renin activity (PRA), BP and heart rate were studied over three hours after both peroral and sublingual administration of captopril. Mean pharmacokinetic parameters for unchanged captopril after sublingual administration were: Cmax, 234 ng·ml−1; tmax, 45 min; AUC (0–3 h), 15.1 μg·ml−1. min. Mean pharmacokinetic parameters for unchanged captopril after peroral administration were: Cmax, 228 ng·ml−1; tmax, 75 min; AUC (0–3 h), 17.0 μg·ml−1. min. tmax was significantly shorter when captopril was administered sublingually; all other pharmacokinetic parameters were equivalent. The plasma captopril concentrations achieved post drug administration led to increases in PRA and reductions in BP. tmax for PRA was 86 min for sublingual captopril and 113 min for perorally administered drug. Peak PRA values were, however, not significantly different. BP, as expected, was not reduced dramatically in these healthy volunteer subjects, however, in systolic BP vs time profiles, BP was significantly lower after volunteers received sublingual captopril. Heart rate increased slightly after captopril administration; there were no differences between the two routes of administration. Administration of captopril sublingually, therefore led to a more rapid attainment of plasma captopril concentrations and had a more rapid onset of pharmacological effect when compared with peroral administration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265850
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  • 63
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    Pharmacokinetics of SUN 1165, a new antiarrhythmic agent, in renal dysfunction (1991)
    Springer
    European journal of clinical pharmacology 40 (1991), S. 411-414 
    Details
    ISSN: 1432-1041
    Keywords: SUN 1165 ; renal failure ; antiarrhythmic agent ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of a new Class I antiarrhythmic agent, SUN 1165, has been studied in 32 patients with varying degrees of renal impairment following a single oral dose of 50 mg. The apparent volume of distribution at steady state was 1.48 1 · kg−1, the absorption rate constant was 2.2 h−1, and plasma protein binding was 26.8% in subjects with normal renal function. These variables were not altered with renal impairment. More than 60% of SUN 1165 given orally was excreted unchanged via the kidney, both by tubular secretion and glomerular filtration. The elimination rate constant, the apparent total body clearance and the apparent renal clearance were linearly correlated with the endogenous creatinine clearance. The half-time of elimination was 3.4 h in normal subjects and it was prolonged to 23.7 h in severe renal failure (creatinine clearance below 20 ml · min−1 · 1.48 m−2). Dosage adjustment of SUN 1165 is necessary in renal failure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265853
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  • 64
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    Electronic Resource
    Cyclopentenyl cytosine: Interspecies predictions based on rodent plasma and urine kinetics (1991)
    Springer
    Investigational new drugs 9 (1991), S. 9-17 
    Details
    ISSN: 1573-0646
    Keywords: cyclopentenyl cytosine ; interspecies ; pharmacokinetics ; toxicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary A hybrid compartmental-physiological model for cyclopentenyl cytosine (CPE-C) is designed on the basis of early limited rodent pharmacokinetic data. Application of model independent pharmacokinetics and biochemical knowledge was first used to conceptualize such a model. The approach was to scale the physiological parameters of the model (compartmental clearances) and keep constant the anatomic parameters of the model (compartment volumes). Scaling of physiological mechanisms was based on body weight/surface area ratios. Using these principles, simulations with the model can reasonably anticipate the in vivo behavior of (CPE-C) in several species (mouse, rat, dog). The model is useful in understanding species differences in pharmacokinetic behavior of CPE-C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00194539
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    Electronic Resource
    Ifosfamide pharmacokinetics (1991)
    Springer
    Investigational new drugs 9 (1991), S. 305-311 
    Details
    ISSN: 1573-0646
    Keywords: ifosfamide ; pharmacokinetics ; review
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract This review examines and details the pharmacokinetics of ifosfamide (a congener of cyclophosphamide) when administered by a number of commonly used chemotherapeutic regimes. The influence of route of administration, schedule of administration and dose on the pharmacokinetics of ifosfamide and its metabolites are discussed. Oral fractionated ifosfamide therapy, which causes an excessively high incidence of neurotoxicity, is similar to intravenous fractionated therapy in that it exhibits a time dependent increase in ifosfamide metabolic clearance. Five g/m2 ifosfamide given intravenously as a short (half hour) or long (24 hr) infusion does not exhibit dose dependent (zero-order) pharmacokinetics. In patients who develop ifosfamide/mesna associated CNS toxicity the pharmacokinetics of parent ifosfamide are not aberrant. This implies that ifosfamide metabolites are more likely to be responsible for the neurotoxicity rather than the parent drug. The development of simple and more specific analytical methodology, will allow further studies of the pharmacokinetics of the active ifosfamide metabolite(s). This may lead to further optimisation of the therapeutic index of ifosfamide treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00183570
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  • 66
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    The pharmacokinetics of aspirin in rats and the effect of buffer (1991)
    Springer
    Journal of pharmacokinetics and pharmacodynamics 19 (1991), S. 157-173 
    Details
    ISSN: 1573-8744
    Keywords: aspirin ; rat ; pharmacokinetics ; effect of buffer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Aspirin (acetylsalicyclic add) was administered to rats intravenously, orally, and intraintestinally at different doses or in different dosage forms. The distribution and elimination kinetics of aspirin in rats following intravenous administration were best described by a two-compartmental open system and were dose independent up to 15 mg/kg. The terminal elimination half-life following intravenous dosing (10 mg/kg) was 3.36±0.85min (n=15) with the clearance being 8.40±1.24 L/(kg.hr). Intravenous distribution and elimination kinetics of aspirin in rats were not influenced by an orally administered buffered solution with a buffer capacity of 0.933 mEq ANC (acid neutralizing capacity) per kg of body weight. However, this orally buffered solution did change the gastrointestinal absorption kinetics of aspirin in rats. The absolute bioavailable dose of aspirin was 56.6±10.4% (n=6)following its administration in an unbuffered solution while it was only 31.8±8.0% (n=6)following administration in the buffered solution. The corresponding values of the absolute bioavailable doses were 43.4±3.7% and 25.5±1.8% following intraintestinal administration. The lower systemic availability of aspirin in the presence of buffer is attributed to a greater fraction of the administered dose becoming available for absorption from the intestine where the extraction efficiency is higher than that in the stomach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01073867
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  • 67
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    Electronic Resource
    Pharmacokinetics and bioavailability of diclofenac in the rat (1991)
    Springer
    Journal of pharmacokinetics and pharmacodynamics 19 (1991), S. 647-665 
    Details
    ISSN: 1573-8744
    Keywords: diclofenac sodium ; biliary excretion ; pharmacokinetics ; bioavailability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Diclofenac sodium is a widely used drug with interesting absorption and disposition features when administered to laboratory animals. The present study was undertaken to assess the pharmacokinetics of the drug after iv and gastrointestinal dosing to rats. Renal excretion of unchanged drug was negligible, but biliary excretion of the drug (unchanged and conjugated) was detected in bile duct-cannulated rats; it accounted for 27.2 and 31.2% of the total dose following iv and intraduodenal administration, respectively. Most of the drug excreted in the bile was conjugated diclofenac; unchanged drug accounted for only 4.7 and 5.4% of total diclofenac excreted in the bile after iv and intraduodenal dosing, respectively. In normal animals, intestinal absorption of the drug excreted in the bile resulted in higher drug concentrations in plasma than those obtained in bile duct-cannulated rats, but only after 60 min of dosing. When administered directly into the duodenum, diclofenac absorption was extremely fast and the maximum plasma diclofenac concentration was reached within 2 min. After oral dosing, an early peak was also observed, but it was lower than that obtained after intraduodenal dosing: 71% diclofenac hioavailability was found in bile duct-cannulated rats intraduodenally dosed, whereas in normal animals dosed by mouth a bioavailability of 79% was obtained. In normal animals intraduodenally dosed, an apparent bioavailability of 106% was observed. All of these features, particularly the influence of enterohepatic circulation on drug bioavailability, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01080872
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    Electronic Resource
    Semiparametric analysis of non-steady-state pharmacodynamic data (1991)
    Springer
    Journal of pharmacokinetics and pharmacodynamics 19 (1991), S. 691-712 
    Details
    ISSN: 1573-8744
    Keywords: pharmacokinetics ; pharmacodynamics ; linear system analysis ; nonlinear system analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract We present an approach to the analysis of pharmacodynamic (PD) data arising from non-steadystate experiments, meant to be used when only PD data, not pharmacokinetic (PK) data, are available. The approach allows estimation of the steady-state relationship between drug input and effect. The analysis is based on a model describing the time dependence of drug effect (E) on (unobserved) drug concentration (Ce) in an hypothetical effect compartment. The model consists of (i) a known model for the input rate of drug I(t), (ii) a parametric model; L(t, a) (a function of time t, and vector of parameters a), relating I to an observed variable X, (iii) a nonparametric model relating X to E. Ce is proportional to X. X(t) is given by I(X) * L(t, a)/AL, where L(t,α)=e −α 1 t * ∑ k=1 m , α2k e −α 2k+1 t, ∑ k=1 m α2k=1, AL=∫ 0 ∞ L(t) dt, and * indicates convolution.The nonparametric model relating X to Eis a cubic spline, a function of X and a vector of (linear) parameters β. The values of α and β are chosen to minimize the sum of squared residuals between predicted and observed E. We also describe a similar model, generalizing a previously described one, to analyze PK/PD data. Applications of the approach to different drug-effect relationships (verapamil-PR interval, hydroxazine-wheal and flare, flecainide and/or verapamil-PR, and left ventricular ejection fraction) are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01080874
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    Electronic Resource
    Gossypol pharmacokinetics in mid-lactation Brown swiss dairy cows (1991)
    Springer
    Veterinary research communications 15 (1991), S. 379-385 
    Details
    ISSN: 1573-7446
    Keywords: cattle ; dairy cow ; gossypol ; pharmacokinetics ; serum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A bolus equivalent to 450 ppm (dosage based on average feed intake for lactating dairy cows of similar mass) of gossypol was administered orally to three Brown Swiss dairy cows in mid lactation daily for a 7-day treatment period. Blood samples were taken daily during a 2-day pretreatment period, the 7-day treatment period and a 6-day recovery period. The serum recovered from the cows was stored at -20°C until analysis for extractable gossypol content. The highest concentration of gossypol (a mean of 0.53 μg/ml serum) was attained in all the cows on day 6 of the treatment period, indicating that a steady-state condition had been reached before the end of the treatment period. The gossypol concentrations then gradually declined during the 6-day recovery period but never fell to the zero baseline. The cows exhibited terminal elimination half-lives of 67, 67.5 and 40 h. Gossypol elimination was best described by a bi-exponential decay curve in two cows and a mono-exponential decay curve in the remaining cow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366995
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  • 70
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    Electronic Resource
    An approximate model-independent method to maintain constant plasma levels of intravenous drugs (1991)
    Springer
    Journal of pharmacokinetics and pharmacodynamics 19 (1991), S. 635-645 
    Details
    ISSN: 1573-8744
    Keywords: pharmacokinetics ; linear systems analysis ; statistical moments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract To rapidly achieve and maintain constant plasma concentrations most intravenous drugs must be administered as an initial bolus followed by a combination of exponentially declining plus constantrate infusions. In the clinical practice of anesthesia and critical care medicine this is often not practical without specialized equipment. In this paper a simpler approach of maintaining approximately constant plasma concentrations is developed using a loading dose with a two- stage infusion scheme (an initial rapid infusion reduced at a given time to a lower rate). Equations are developed for determining the rate of the infusions as well as the duration of the initial infusion by equating moments of the Laplace transform of the approximate infusion to the moments of the Laplace transform of an exact solution. This approach is independent of models and uses as parameters the moments of the curve relating the concentration following a single iv dose of unit magnitude as a function of time. The accuracy of this technique was assessed by computer simulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01080871
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    Estimation of amobarbital plasma-effect site equilibration kinetics. Relevance of polyexponential conductance functions (1991)
    Springer
    Journal of pharmacokinetics and pharmacodynamics 19 (1991), S. 617-634 
    Details
    ISSN: 1573-8744
    Keywords: pharmacokinetics ; pharmacodynamics ; system approaches ; electroencephalogram ; amobarbital ; effect site equilibration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The time delay between drug plasma concentrations and effect has been modeled most commonly by the effect compartment approach, assuming first-order monoexponential equilibrium kinetics between plasma and effect site. So far this assumption has not been rigorously probed. The purpose of the present investigation was to model the delay between amobarbital plasma concentrations and EEG effect using a new approach based on system analysis principles. This approach models the equilibrium between plasma and effect site without assuming a specific kinetic structure. Assuming linear distribution kinetics between plasma and effect site, the relationship between the two variables may be described by a convolution type of linear operation, involving a conductance function ϕ(t),which is approximated by a sum of exponentials. Six male Wistarderived rats received an iv infusion of amobarbital at a rate of 10mg/kg per min until isoelectric periods of 5sec or longer appeared on the EEG. Frequent arterial blood samples were obtained and EEG was continuously quantified using aperiodic analysis. The amplitudes in the 2.5–30Hz frequency band were used as EEG effect measure. The delay between plasma concentrations and EEG effect was best modeled by a biexponential conductance function. The use of a biexponential conductance function resulted in a significant further reduction (41 ± 10%)in hysteresis when compared to a monoexponential function, indicating that the assumption of simple first-order monoexponential equilibration kinetics is inadequate. The use of a biexponential conductance function also resulted in a significantly different shape of the effect site concenration- EEG effect relationship and hence the estimated pharmacodynamic parameters, when compared with a monoexponential function. This relationship showed a biphasic behavior, with EEG effects being maximal at amobarbital concentrations of 29.6± 1.3mg/L. At 80.2±2.0mg/L the EEG effect was reduced 50%below baseline values. A comparison was made with the equilibration between amobarbital plasma and cerebrospinal fluid (CSF) concentrations. Six male Wistarderived rats received an iv infusion of amobarbital, 10mg per min for 15min. Arterial blood and CSF samples were taken simultaneously at regular intervals. The equilibration between plasma and CSF concentrations was best fitted by a monoexponential conductance function. Significant differences in equilibration profiles of CSF and effect site with the plasma site were observed. To reach 50%equilibrium the effect site requires 2.5±0.3min and the CSF 3.5±0.2min, to reach 95%the values were, respectively, 90± 27and 15± 1min. This suggests that CSF is kinetically distinguishable from the effect site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01080870
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    A pharmacokinetic model describing the removal of circulating radiolabeled antibody by extracorporeal immunoadsorption (1991)
    Springer
    Journal of pharmacokinetics and pharmacodynamics 19 (1991), S. 385-403 
    Details
    ISSN: 1573-8744
    Keywords: immunoadsorption ; pharmacokinetics ; extracorporeal ; monoclonal antibody ; compartmental model ; simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Extracorporeal immunoadsorption is a new technique for removal of circulating radiolabeled antibody from the peripheral blood (1) to reduce background activity for improved tumor imaging, and (2) to reduce whole-body and marrow toxicity when high doses of radiolabeled antibodies are used for antitumor therapy. A pharmacokinetic model was developed to describe plasma disappearance of111In -KC-4G3 prior to, during, and after immunoadsorption in humans. The model is developed based on a two-compartment open model, and during immunoadsorption a third compartment is added for removed radioactivity by the immunoadsorption column. Goodness-of-fit statistics indicate a good fit of the model to the data. The resulting pharmacokinetic parameters for a selected patient are V1=2.64L, Vss=3.64 L, t1/2α=3.77hr, and t1/2β hr. The immunoadsorption clearance (CL1A=19.3 ml/min) was 21-fold greater than the patient's plasma clearance (CL10=0.899 ml/min), indicating a very effective immunoadsorption process. The model predicts an increase in plasma radioactivity upon termination of immunoadsorption, probably due to redistribution of radioactivity from the extravascular compartment to the plasma in response to the rapid decline in plasma radioactivity during immunoadsorption. Two series of simulations were performed to examine the influence of onset time and duration of immunoadsorption. In series one the onset time was varied and in series two immunoadsorption duration was varied. In series one, the predicted radioactivity amounts adsorbed by the immunoadsorption column ranged from 75% of the injected dose (4-hr onset) to 52% of the injected dose (24-hr onset). In series two, immunoadsorbed radioactivity ranged from 32% (2-hr duration) to 64% of the injected dose (12-hr duration). When instituted as early as 4 hr, the predictions suggest that earlier immmoadsorption onset improves the effectiveness of radioactivity removal, relating to higher early circulation concentrations, and longer immunoadsorption periods remove more radioactivity, but also result in larger predicted radioactivity redistribution from tissue to plasma. To employ the immunoadsorption procedure for tumor imaging and therapy optimally, the data and our predictions indicate that a compromise must be made that will balance immunoadsorption onset and duration against tumor radioactivity uptake and subsequent radioactivity redistribution from tissues back to plasma. Together with biologic considerations providing sufficient antigenantibody interaction and dependent on the utilized radioisotope, these data support the utility of extracorporeal immunoadsorption during the radioimmunodetection of cancer and for future therapeutic applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01061663
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    A kinetic-dynamic model to explain the relationship between high potency and slow onset time for neuromuscular blocking drugs (1991)
    Springer
    Journal of pharmacokinetics and pharmacodynamics 19 (1991), S. 537-552 
    Details
    ISSN: 1573-8744
    Keywords: Modeling ; neuromuscular blocking drugs ; pharmacodynamics ; pharmacokinetics ; potency ; onset time
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract To account for experimental data showing increased onset time with increased potency of neuromuscular blocking drugs, a pharmacokinetic-pharmacodynamic model is presented. It is characterized by a finite concentration of receptors (R)in the effect compartment. Transfer from central to effect compartment is linearly related to concentration gradient. A sigmoid Emax model is used to describe the relationship between receptor occupancy and effect. Plasma concentrations found in the literature are used. Differential equations are solved numerically for equipotent doses of drugs of different potencies. Because the density of receptors constitutes a significant drain of drug molecules for potent drugs, the model predicts an inverse relationship between speed of onset and potency. The concentration of receptors in the effect compartment Rwhich best fits experimental data obtained in humans is 0.28 Μmol/L. With this value of R,onset times are prolonged when the ED95 (dose for 95% blockade) is less than 0.1 Μmol/kg. It is concluded that, in the development of a short-acting nondepolarizing neuromuscular blocking drug, agents having an ED95 of 0.1 Μmol/kg or greater appear more promising.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01062962
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  • 74
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    System analysis in multiple dose kinetics: Evidence for saturable tubular reabsorption of the organic cationN 1-methylnicotinamide in humans (1991)
    Springer
    Journal of pharmacokinetics and pharmacodynamics 19 (1991), S. 553-574 
    Details
    ISSN: 1573-8744
    Keywords: pharmacokinetics ; N 1-methylnicotmamide ; nicotinic acid metabolite ; organic cation ; saturation of tubular reabsorption ; tubular secretion ; system analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The renal clearance of N1-methylnicotinamide (NMN) was studied in 8 young women at physiological steady state and at steady state following a combined loading bolus and in infusion. Urinary NMN concentrations were determined using a new HPLC method, plasma levels by a conventional fluorescence method. At physiological levels net tubular secretion of NMN was evident due to a renal fractional excretion, i.e., a ratio of renal NMN clearance to creatinine clearance, above unity. Increasing plasma concentrations lead to an increase in the fractional excretion, indicating saturation of the underlying tubular reabsorption process. Binding to plasma proteins was excluded by ultra-filtration experiments. Clearances measured at physiological levels were about one half of the maximum renal clearance attained following the infusion. This maximum value was approximately six times the creatinine clearance and may be a useful approximation of the renal plasma flow. System analysis, including a novel method to calculate the net response following a multiple input, was used to determine the pharmacokinetic system parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01062963
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    Required beta blocker profile in the elderly (1991)
    Springer
    Cardiovascular drugs and therapy 4 (1991), S. 1273-1280 
    Details
    ISSN: 1573-7241
    Keywords: beta blockade ; elderly ; pharmacokinetics ; renal function ; renin ; hemodynamics ; respiratory function ; diabetes mellitus ; lipid profile ; celiprolol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In the truly elderly, a complex balance between compensatory processes and impaired organ function allows reasonably normal physical function. It is argued that beta blockade should have certain desirable qualities to minimize any impairment of organ function, thereby upsetting the quality of life. Thus a simple pharmacokinetic pattern without hepatic metabolism is less likely to cause unexpected variation in blood levels of the beta blocking agents and to have fewer risks of interactions with other drugs including nicotine. Renal-excreted beta blockers-such as atenolol, nadolol, and celiprolol-do, however, need downward dose adjustment when the glomerular filtration rates fall. The elderly are frequently categorized as having a low renin profile, which in the view of some workers may make a vasodilatory beta blocker more desirable. Hemodynamic advantages of such agents include the prime site of attack in hypertension on the increased peripheral vascular resistance, increasingly fundamental with a prolonged duration of hypertension and therefore with the aging process. Furthermore, a normal heart rate with a sustained cardiac output may avoid symptomatic bradycardia. In the elderly, respiratory function may be impaired so that loss of elastic recoil causes elderly emphysema. A highly cardioselective beta blocker should be an advantage. Finally, minimal interference with glucose and lipid metabolism should also be desirable goals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00114233
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  • 76
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    CINA: a software to Compose INfusion sheets for IV Anesthetic drugs (1991)
    Springer
    Journal of clinical monitoring and computing 8 (1991), S. 225-229 
    Details
    ISSN: 1573-2614
    Keywords: anesthetics ; intravenous ; pharmacokinetics ; computers ; simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Medicine
    Notes: Summary CINA is a software which uses LOTUS 1-2-3 commands and macros and it runs on an IBM PC. It contains an extensive database of three sections. Section 1 includes a list of several models of commercialized infusion devices. Section 2 presents the available IV packagings for a list of IV drugs. Section 3 contains the record of IV standard infusion regimens for each drug. Any other new infusion device, drug, or standard infusion regimen can be added or modified. The software verifies the compatibility of the prescribed infusion device according to the available drug packaging contained in the database. Moreover, it converts the infusion steps into the flow-rate units of the selected infusion device according to the patient's weight and the chosen drug concentration. Finally, the software allows the storage of all the information on a disk file or outputting on a printer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01738896
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    Antiparkinsonian dopamine agonists: a review of the pharmacokinetics and neuropharmacology in animals and humans (1991)
    Springer
    Journal of neural transmission 3 (1991), S. 151-201 
    Details
    ISSN: 1435-1463
    Keywords: Dopamine agonists ; Parkinson's disease ; apomorphine ; bromocriptine ; lisuride ; pergolide ; SKF 38 393 ; quinpirole ; pharmacokinetics ; biotransformation ; neuropharmacology ; neurobiochemistry ; rodents ; dog ; monkey ; human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary With the intention of compensating for the deficit of endogenous dopamine (DA) in the basal ganglia of Parkinsonian patients by substitution with agents which directly stimulate central DA receptors, synthetic DA agonists have been introduced almost 20 years ago for the symptomatic treatment of Parkinson's disease. The original expectation that DA agonists would be able to completely restore extrapyramidal motor function in Parkinsonian patients has turned out as too mechanistic and simplicative. However, undoubtedly DA agonists have improved therapeutic possibilities in Parkinson's disease. Thus, clinical evidence from controlled chronic studies in patients indicates that the therapeutic results following the early application of DA agonists in combination with L-DOPA on a long-term base are superior to the respective monotherapy. However, none of the DA agonists currently employed for antiparkinsonian treatment i.e. apomorphine and the ergoline derivatives bromocriptine, lisuride and pergolide, is optimal with respect to pharmacokinetic properties (poor oral bioavailability with considerable intra-and interindividual variation) or pharmacological profiles (low selectivity for DA receptors in case of the ergot agonists). The pathophysiology underlying Parkinson's disease which turned out more complex than initially expected might provide another explanation for the limited therapeutic potential of DA agonists. Therefore, apart from summarizing the pharmacokinetics, biotransformation, neuropharmacology and neurobiochemistry, of the DA agonists employed clinically, the present article also reviews physiological aspects of (a) central dopaminergic neurotransmission including the topographical distribution of DA receptor subtypes and their functional significance, (b) the intracellular signal processing in striatal output neurons and (c) the intraneuronal mechanisms which integrate the various neurotransmitter signals converging on the striatal output neuron to a demand-adjusted effector cell response via the cross-talk between the different second messenger systems. Based on these considerations, potential pharmacological approaches for the development of improved antiparkinsonian drugs are outlined. There is a therapeutic demand for more selective and better bioavailable DA agonists. In particular, selective D-1 receptor agonists are highly desirable to provide a more specific probe than SKF 38 393 for clarifying the current controversy on the disparate findings in nonprimate species and monkeys or Parkinsonian patients, respectively, regarding the functional significance of D-1 receptors for the antiparkinsonian action of DA agonists or L-DOPA. The therapeutic importance of D-2 receptor activation is generally accepted; whether DA agonists combining a balanced affinity to both D-1 and D-2 receptors within one molecule (to some extent a property of apomorphine) might be superior to subtype-specific DA agonists remains to be tested clinically. Beside selective DA agonists with markedly increased absolute oral bioavailability, the following alternative approaches for the symptomatic treatment of Parkinson's disease seem worth pursuing: (a) diminuition of excitatory amino acid (EAA)-mediated neurotransmission in the basal ganglia output nuclei, e.g. by EAA receptor antagonists, (b) pharmacological manipulation of the intracellular second messenger signals generated by DA, EAA's or acetylcholine in the striatal output neurons. Furthermore, preliminary experimental evidence indicates that, apart from symptomatic treatment, a preventive (neuroprotective) therapy of Parkinson's disease might be conceivable with EAA receptor antagonists.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259537
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    Plasma concentrations of 5-methoxytryptamine, 5-methoxytryptophol and melatonin after 5-methoxytryptamine administration of golden hamsters: physiological implications (1991)
    Springer
    Journal of neural transmission 84 (1991), S. 33-43 
    Details
    ISSN: 1435-1463
    Keywords: 5-Methoxytryptamine ; 5-methoxytryptophol ; melatonin ; pineal ; HPLC ; pharmacokinetics ; golden hamster
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 5-Methoxytryptamine (5-MT), 5-methoxytryptophol (5-ML) and melatonin (Mel) were measured in the plasma after 2, 5, and 8 weeks administration of 25 Μg 5-MT to golden hamsters kept under long photoperiod. 5-MT showed a one compartment kinetic profile in the plasma with half lives of 14.8 min after 2 weeks, 15 min after 5 weeks and 19.1 min after 8 weeks. A rapid metabolism of 5-MT was shown, Mel and 5-ML being detected in the plasma following 5-MT administration. However it was also shown that the gonadal atrophy observed after 5-MT administration cannot be due to its metabolism into these 2 compounds. Indeed when exogenously administered at a dose generating the same plasma concentration as that observed after 5-MT, the gonadal regression observed after the association of 5-ML and Mel is much less than that observed after 5-MT. 5-MT is thus a compound of great physiological interest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01249107
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    Masthead (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991) 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130050101
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    Biomedical applications of chiral liquid chromatography (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 128-132 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Many drugs are recemic and therefore much effort has to be devoted towards the stereoselective synthesis of the most effective or less harmful component of a racemic mixture. High performance liquid chromatography will play an important role in the clinical analysis of racemic drugs in anticipation of regulations that are currently being discussed and are expected to be enforced by the end of this decade. In this review a number of methods for chiral resolution are outlined. These include the formation of diastereoisomers and the use of chiral stationary phases or chiral mobile phase additives.
    Additional Material: 3 Ill.
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    URL: http://dx.doi.org/10.1002/bmc.1130050307
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    Product news (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 141-141 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130050310
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    Medium- and long-chain 3-hydroxymonocarboxylic acids: Analysis by gas chromatography combined with mass spectrometry (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 161-164 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Medium- and long-chain 3-hydroxymonocarboxylic acids represent intermediates in the β-oxidation of fatty acids: they accumulate in the plasma of patients with an inherited deficiency of long-chain 3-hydroxyacylcoenzyme A dehydrogenase. 3-Hydroxy acids with chain lengths varying from 6 to 16 were synthesized by a Reformatzky reaction. Capillary gas chromatography of the pertrimethylsilyl derivatives was performed on a CP-Sil 19 CB column, coupled to a quadrupole mass spectrometer in the electron impact mode. Calculation of the retention indices showed that the separation of the 3-hydroxy acids from the homologous straight-chain fatty acids may be troublesome, stressing the need for mass spectrometric identification.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/bmc.1130050405
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    Analysis of vitamin D and its metabolites using thermospray liquid chromatography/mass spectrometry (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 153-160 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: A new method is described for the analysis of vitamin D and its metabolites utilizing thermospray (TSP) mass spectrometry as an on-line detector for high performance liquid chromatogrpahy. Ionization conditions were optimized for use with isocratic reversed phase chromatography. TSP mass spectrometry was employed in series with a UV absorbance detector to facilitate comparisons between the two methods of detection. Positive ion TSP mass spectra were recorded for vitamin D2, vitamin D3, 25-hydroxyvitamin D3 (25(OH)D3), 1,25-dihydroxyvitamin D3 (1,25(OH)2D3) and 24,25-dihydroxyvitamin D3 (24,25(OH)2D3). The spectra contained protonated molecular ions, ammonium adduct ions and fragment ions due to the loss of one or more molecules of water. A comparison of quantitative precision was made by determining UV absorbance and TSP standard curves for vitamin D3 using two different methods: (1) External standard method with post-column (post UV detector) addition of ammonium acetate. (2) As (1) but using the method of internal standards with a closely eluting internal standard (vitamin D2). In each case the quantitative precision (correlation coefficient) for UV absorbance detection was superior owing to intrinsic instability of the TSP ion beam. A stable isotopically labelled internal standard was employed in the development of an assay for 1,25(OH)2D3. The assay was used to quantify in vitro enzymic conversion of 25(OH)D3 to 1,25(OH)2D3 in guinea pig and sheep renal mitochondrial incubations. TSP LC/MS was also applied to analysis of an extract of human blood plasma in which D3 and each of its principal metabolites were identified in a single analysis.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130050404
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    Chromatographic techniques in inborn errors of metabolism (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 113-121 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Chromatography has played a pivotal role in the advances made during the last 30 years in our knowledge of inborn errors of metabolism. This review discusses the application of some of these techniques to the analysis of organic acids and acylcarnitines. The separation of organic acids needed a comprehensive approach that would permit all of the many organic acids present in urine or other complex mixtures to be extracted, analysed and identified in a single run. This required analytical methods of great resolving power, wide linear range and universal detectors such as gas chromatography (GC), or GC coupled with mass spectrometry. Sample preparation was another problem that has been tackled by a variety of approaches. Organic solvents have been employed widely for the extraction of organic acids from physiological fluids. Unfortunately, recoveries of the different organic acids by this method are sometimes less than quantitative and variable depending on the compound. Other methods, such as the use of DEAE-Sephadex columns, have the advantage of resulting in close to 100% recoveries, but are more tedious. Liquid partition chromatography on short silicic acid columns has also been recommended as a useful clean-up step prior to GC, permitting both the identification and quantitation of organic acids in urine, plasma or amniotic fluid. Although many derivatization procedures have been used to prepare organic acids for gas chromatography, the most common is trimethylsilylation. Oxo acids are usually reacted with one of several commonly used reagents to form oximes. GC analysis of organic acids was initially done using packed columns with methylsilicone-based, non-polar stationary phases. In recent years most laboratories have switched to the commercially available, bonded-phase capillary columns. Some authors have recommended the use of two columns of slightly differing polarities to improve the reliability of identification without mass spectrometry. Carnitine and acylcarnitines are substances whose measurement may yield useful diagnostic information about inborn errors and about the basic biochemical mechanisms of disease. While free carnitine is usually measured by a radioenzymatic assay, the separation of acylcarnitines requires paper chromatography or high performance liquid chromatography. The identification of various acylcarnitines following separation has been accomplished by mass spectrometric methods. Another technique relies on gas chromatographic identification of the acyl groups liberated following alkaline hydrolysis. Recently, liquid chromatography/mass spectrometry has also been utilized to separate and identify the various acylcarnitines present in urine and other biological samples.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/bmc.1130050305
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    High performance liquid chromatography of glucose using a post-column reactor of immobilized enzyme followed by electrochemical detection (glucose-LCEC) (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 180-183 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: A sensitive and selective, reasonably fast method for the determination of glucose content has been developed. A glucose oxidase immobilized column was coupled to a small-size anion exchange column/borate buffer chromatograph. The hydrogen peroxide produced in the enzyme reaction was detected directly by an amperometric detector using a platinum working electrode. The detection limit was 0.03 ppm (1.5 × 10-7 M, 3 pmol/injection). The linear dynamic range was three orders of magnitude at least. The system was stable and reproducible both in short-and long-term operation. The proposed method is suitable for analysis of complicated matrices of biological samples because of its good selectivity and sensitivity.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130050409
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    Masthead (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991) 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130050501
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    Plasma B-6 vitamer and plasma and urinary 4-pyridoxic acid concentrations in young women as determined using high performance liquid chromatography (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 198-201 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Plasma B-6 vitamer and plasma and urinary 4-pyridoxic acid concentrations of 21 young white women, 21-27 years, having radiomonitored pyridoxal 5′-phosphate and coenzyme stimulation of erythrocyte alanine amino-transferase activities indicative of adequate vitamin B-6 status were determined in an effort to establish normal ranges for plasma B-6 vitamers. B-6 vitamers and 4-pyridoxic acid were quantitated using reversed phase high performance liquid chromatography with fluorometric and ultraviolet detection. Pyridoxal phosphate values obtained by radioenzymatic and chromatographic, fluorometric and ultraviolet, assays were highly correlated as were pyridoxine phosphate values determined using both detectors. The B-6 vitamer and 4-pyridoxic acid values of these subjects should be of use in the establishment of normal ranges of these congeners in women.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/bmc.1130050504
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    Comparative performance of ion exchange and ion-paired reversed phase high performance liquid chromatography for the determination of nucleotides in biological samples (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 207-211 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: We have compared anion exchange chromatography on APS-Hypersil (4.6 × 100 mm) eluted with a phosphate gradient with reversed phase chromatography on ODS-Hypersil (4.6 × 100 mm) in the presence of either tetrabutylammonium (TBA) or triethylammonium (TEA) ions with a methanol gradient. The systems have been compared both for ease of operation and for their resolving power with standard mixtures and acid extracts of both normal red cells (RBC) and ischaemic tissues. The two chromatographic modes exhibited similar separating efficiencies for standard mixtures of nucleotides but retention times were most stable using reversed phase liquid chromatography (RPLC) with TEA. Anion exchange columns slowly lost ion exchange capacity but selectivity was unchanged. RPLC in the presence of TBA gave reproducibile capacity factors only when operated isocratically due to irreversible changes to the silica surface. For RBCs the RPLC with TEA and anion exchange sysems resolved 17 and 15 peaks, respectively, and for the ischaemic samples 22 and 14 peaks, respectively. However, nucleosides and bases were also resolved by the ODS column causing chromatographic crowding and uncertain peak identification.
    Additional Material: 4 Ill.
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    URL: http://dx.doi.org/10.1002/bmc.1130050506
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    Liver high performance liquid chromatographic porphyrin profiles in experimental porphyria induced by peroxidizing herbicides (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 229-230 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The effect of peroxidizing herbicides on the liver porphyrin content of experimental animals was examined. Mice treated with the herbicide oxadiazon accumulated uroporphyrin and protoporphyrin in the liver. Fomesafen-treated mice accumulated uroporphyrin and heptacarboxylic porphyrin.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130050511
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    The measurement of nucleoside deaminases by high performance liquid chromatography and their use in clinical chemistry (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 235-239 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The measurement of the nucleoside deaminases - cytidine deaminase, guanosine deaminase and adenosine deaminase - by reversed phase high performance liquid chromatography is reviewed. The clinical value of assaying the enzyme activity is discussed for each of these enzymes. Both cytidine deaminase and adenosine deaminase measurements have proven clinical value, although the use of the assay of cytidine deaminase in the diagnosis of pre-eclampsia is probably not helpful.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130050602
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    Determination of the enantiomeric purity of scopolamine isolated from plant extract using achiral/chiral coupled column chromatography (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 3-7 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The optical purity of scopolamine derived from Datura sanguinea was determined using coupled column chromatography. A C18 column was used to separate scopolamine from the additional alkaloids and other biological material present in the vegetal extract. The C18 column was coupled through a six-port switching valve to two β-cyclodextrin columns in series which were used to resolve the scopolamine enantiomers. A single acetylated β-cyclodextrin column gives equivalent results to the native cyclodextrin columns because of slightly higher enantioselectivity for scopolamine. A multistep extraction procedure is used to isolate scopolamine from the vegetal material. 4-6% of the scopolamine in the final extract was found to be the d enantiomer. Sample extracts as well as commercial scopolamine hydrobromide were treated under various conditions commonly encountered during typical commercial extraction procedures and analyzed in order to determine if the d enantiomer was present in the original material or if it was produced during the extraction process and, if so, determine which step and conditions contribute to acemization. Both the salt and the extract were found to be susceptible to racemization under basic conditions (≥pH 9) although the extract appeared to be more susceptible than the salt. Tropic acid formed from the hydrolysis of scopolamine seemed to be completely racemized even though the remaining scopolamine was only partially racemized. Within experimental error, no d enantiomer was found in the original fresh plant material.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130050103
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  • 92
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    Enantiomeric analysis of phenylpropanolamine in plasma via resolution of dinitrophenylurea derivatives on a high performance liquid chromatographic chiral stationary phase (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 43-46 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Racemic phenylpropanolamine was resolved on a high performance liquid chromatographic (HPLC) chiral stationary phase (CSP) as the 3,5-dinitrophenyl ureide derivative. The CSP was prepared by a simple in situ procedure in which (R)-(1-naphthyl)ethyl isocyanate was bound to aminopropyl silanized silica through a urea linkage. The enantiomeric ureides were prepared by a room-temperature, 60-second procedure, accomplishing simultaneous extraction and derivatization and utilizing achiral 3,5-dinitrophenyl isocyanate as reagent. Baseline resolution was readily achieved under normal phase conditions, with a separation factor (α) of 1.16 and a resolution factor (Rs) of 2.2. Elution was complete within 10 min. A limit of detection, by UV at 235 nm, of 250 pg per isomer was established. Feasibility of the procedure for plasma determinations was demonstrated by assay of samples from a canine subject.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130050110
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  • 93
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    Evaluation of peroxyoxalate chemiluminescence postcolumn detection of fluphenazine in urine and blood plasma using high performance liquid chromatography (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 47-52 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Peroxyoxalate chemiluminescence may be used for sensitive postcolumn detection of phenothiazine analytes separated by high performance liquid chromatography with appropriate optimization of measurement conditions such as solvent, pH and oxalate ester. Detectability of fluorescent analytes by chemical excitation varies greatly, but analytes with low oxidation potentials are generally more readily detected at low levels, as demonstrated for phenothiazines, an important class of fluorescent drugs. Some improvement in detection limits is observed for fluphenazine when chemiluminescence detection is compared to conventional fluorescence detection. Because of the specificity of chemical excitation, fewer interferences from fluorescent impurities in a urine matrix are observed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130050111
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  • 94
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    Simultaneous determination of gemfibrozil and its metabolites in plasma and urine by a fully automated high performance liquid chromatographic system (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 68-73 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Sensitive and specific methods for the simultaneous determination of gemfibrozil (Lopid®), a lipid-lowering agent, and its metabolites in plasma and urine are described. The methods are based on a fully automated high performance liquid chromatographic (HPLC) system with fluorescence detection. Urine samples, diluted with acetonitrile, were directly analysed by HPLC using a flow and eluent programming method. In the case of plasma, gemfibrozil and its main metabolites were extracted from acidified samples and the resulting extracts injected into the chromatographic system. The sensitivity was approximately 100 ng/mL for gemfibrozil and its four metabolites using 0.5 mL plasma or urine. An acyl glucuronide of gemfibrozil excreted in human urine after oral administration of the drug was isolated and its structure and stability examined.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130050205
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  • 95
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    Separation of β- and γ-tocopherols in serum by high performance liquid chromatography (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 83-85 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: A simple and sensitive high performance liquid chromatographic method for the analysis of tocopherols (α, β, γ and δ) in serum with UV detection is described. In normal phase mode excellent separation of positional isomers (β and γ) was achieved by adjusting the proportion of isopropanol in the mobile phase. Detection limits for both β and γ were 0.62 mg/L and 0.42 and 1.2 mg/L for α and δ isomers, respectively. Measurement of all the tocopoherol structural isomers (α, β, γ and δ) in a sample required only 400 μL of serum and each run was completed in less than 22 min.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130050208
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  • 96
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    Chromatographic analysis of drugs in biological systems (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 1-1 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130050102
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  • 97
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    High performance liquid chromatographic determination of theophylline metabolites in human liver microsomes (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 38-42 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: A high performance liquid chromatographic (HPLC) technique for the determination of three metabolites of theophylline, 3-methylxanthine (3-MX), 1-methylxanthine (1-MX) and 1,3-dimethyluric acid (1,3-DMU) in human liver microsomes is described. The analytes were extracted from human liver microsomes with methylene chloride/isopropanol and stepwise gradient elution was employed for the resolution of peaks. The limits of quantitation were 15 ng/mL for 3-MX, 20 ng/mL for 1-MX and 20 ng/mL for 1,3-DMU. The calibration range was linear for the three metabolites and the calibration ranges were 15-250 ng/mL for 3-MX, 20-250 ng/mL for 1-MX and 250-4000 ng/mL for 1,3-DMU. The absolute recovery ranged from 63-84% for 3-MX, 65-79% for 1-MX and 77-89% for 1,3-DMU over the calibration curve range. Accuracy for all three metabolites was within ± 10% and adequate seletivity was demonstrated by the lack of interfering peaks in blank chromatograms. The within-run and interday precision were within 10% RSD for all three metabolites tested at two concentrations. The advantage of this method over previous methods is that the use of quaternary ammonium ion pair reagents in the mobile phase has been obviated. Also, unlike a previous radiometric HPLC method, the need for radiolabelled theophylline has also been eliminated. The method was used to characterize theophylline metasbolism in human liver microsomes for immunoinhibition studies and to investigate the interaction of theophylline with selected quinolone antibiotitics.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130050109
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  • 98
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    Identification of peroxyacetic acid uroporphyrin I in the urine of patients with congenital erythropoietic porphyria by liquid chromatography and mass spectrometry (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 53-56 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: A new porphyrin, peroxyacetic acid uroporphyrin I, has been isolated from the urine of patients with congenital erythropoietic porphyria by reversed phase high performance liquid chromatography. The porphyrin was characterized by high resolution mass spectrometry and by typical chemical reactions of a peroxyacid.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130050202
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  • 99
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    Direct enantiomeric high performance liquid chromatographic separation of aminoglutethimide and its major metabolite on a series of Chiralcel OD and Chiralcel OJ columns and its application to biological fluids (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 74-77 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: A direct, isocratic, sensitive and precise liquid chromatographic method is presented for the enantiomeric separation of aminoglutethimide (AG) and its acetylated metabolite (AcAG) using cellulose tris-3,5-dimethyl phenyl carbamate (Chiralcel OD) and cellulose tris(4-methylphenyl benzoate) ester (Chiralcel OJ) columns in series. The enantiomeric elution order is determined by separate chromatography of the racemate AG and racemate AcAG and of their separate enantiomers under similar conditions. This method has been used to determine and identify the enantiomers of AG and AcAG in the urine sample collected from a metastatic breast cancer patient after administration of AG for 24 h. Large amounts of (+)-R-AG are excreted unchanged in the urine together with smaller quantities of (+)-R-AcAG, while most of the (-)-S-AG is metabolically converted into (-)-S-AcAG.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130050206
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  • 100
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    Electronic Resource
    Microdetermination of hyaluronic acid in human urine by high performance liquid chromatography (1991)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 5 (1991), S. 189-192 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: A high performance liquid chromatographic (HPLC) system is described for determination of the unsaturated disaccharide (ΔDi-HA) derived from hyaluronic acid (HA) in human urine by digestion with hyaluronidase SD. The effects of eluents on the separation of ΔDi-HA and ΔDi-OS, which is derived from the reaction of chondroitin with the enzyme, have been studied. The established chromatographic conditions were as follows-column: a stainless steel tube (4 mm i.d. × 250 mm) packed with TSKgel NH2-60; eluent: a mixture of acetonitrile and 0.1 M Tris-HCI buffer containing 0.1 M boric acid and 10 mM sodium sulphate, pH 7.0 (64:36, v/v). The strong fluorescence of unsaturated disaccharide after the reaction with 2-cyanoacetamide in alkaline medium was used for post-column detection. The calibration curve for ΔDi-HA was linear in the range 5 pmol-5 nmol with a practical detection limit of 2 pmol. The assay coefficients of variation (n = 5) at 200 pmol for ΔDi-HA and ΔDi-OS were 1.7 and 1.5%, respectively. This HPLC system has been applied to the determination of HA in human urine.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130050502
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