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  • Digitale Medien  (837)
  • 1980-1984  (837)
  • pharmacokinetics  (424)
  • Gas chromatography  (412)
  • Nuclear reactions
Materialart
  • Digitale Medien  (837)
Erscheinungszeitraum
Jahr
  • 101
    ISSN: 1573-8744
    Schlagwort(e): hydrochlorothiazide ; triamterene ; hydroxytriamterene sulfate ; pharmacokinetics ; bioavailability ; renal clearance ; interaction
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Hydrochlorothiazide, triamterene, and hydroxytriamterene sulfate were monitored in the plasma and urine of 24 healthy young men taking single doses of a liquid preparation containing both hydrochlorothiazide and triameterene, liquid preparations containing either of these drugs alone, and a combination tablet recently formulated with a dose ratio of hydrochlorothiazide: triamterene (1∶1,5) found to give optimal potassium-sparing effect. In contradiction to a recent publication, no interaction between the drugs affecting the bioavailability or renal clearance of either could be demonstrated. The previous report of drug-drug interaction probably arose from formulationrelated problems with bioavailability from the two capsule and two tablet products which had been studied. A well-formulated hydrochlorothiazide-triamterene combination tablet promotes plasma concentrations and urinary excretion of hydrochlorothiazide, triamterene, and hydroxytriamterene sulfate which are virtually identical to those seen after either a combination liquid dosage form or simple liquid forms containing only one of the two drugs.
    Materialart: Digitale Medien
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  • 102
    Digitale Medien
    Digitale Medien
    Springer
    Journal of pharmacokinetics and pharmacodynamics 12 (1984), S. 289-313 
    ISSN: 1573-8744
    Schlagwort(e): protein binding ; pharmacokinetics ; bioavailability ; disopyramide ; heart failure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The pharmacokinetics and bioavailability of total (bound plus unbound) and unbound disopyramide were compared following the simultaneous administration of an oral dose of disopyramide and an intravenous dose of14C-disopyramide in five normal volunteers and in 11 patients with congestive heart failure. The binding of disopyramide varied between 60 and 92% in patients and between 81 and 88% in normal subjects at postequilibrium drug concentrations of 10−7M. The binding of disopyramide to serum protein was concentration-dependent in all study subjects at serum concentrations achieved following drug administration. The association constant for the first binding site in serum from normal subjects and patients averaged 8.7X105 M−1 and 4.4X10 5 M−1, respectively (p 〈 0.05). The unbound clearance of disopyramide averaged 277ml/min and 209 ml/min in normal subjects and in patients (p 〈 0.05). When normalized for body weight, the unbound clearance between patients and normal subjects was not significantly different. The elimination half-life of unbound concentrations in normal subjects and in patients averaged 4.9 and 6.1 h, respectively (p 〈 0.05). The clearance and elimination half-life of total disopyramide was the same in both groups. Although the bioavailability of disopyramide averaged 0.85 in both groups, it was more variable in patients owing to the variability in the fraction of the dose absorbed. The unbound renal clearance and volume of distribution at steady state of disopyramide was related to cardiac index. The ratio of elimination half-lives of total and unbound disopyramide was related to the extent of serum protein binding.
    Materialart: Digitale Medien
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  • 103
    Digitale Medien
    Digitale Medien
    Springer
    Journal of pharmacokinetics and pharmacodynamics 12 (1984), S. 263-287 
    ISSN: 1573-8744
    Schlagwort(e): beta-adrenoceptor blocking agents ; pharmacokinetics ; structure ; lipophilicity ; octanol/water partition coefficient
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The structure and pharmacokinetics relationship of 14-beta-adrenoceptor antagonists was investigated in humans. Statistically significant linear and parabolic correlations were found to exist between standard and derived mean pharmacokinetic parameters and the apparent octanol/buffer (pH7.4) partition coefficient of the compounds. The lipophilic/hydrophilic properties were the primary determinants for the pharmacokinetic behavior of the compounds. Most of the pharmacokinetic parameters were also significantly correlated with the plasma protein/plasma water partition coefficient for the compounds. When the values of the pharmacokinetic parameters of the individual compounds were predicted from the regressions on the apparent partition coefficients in octanol/buffer (pH 7.4) and in plasma protein/plasma water, the error was on average 60%.
    Materialart: Digitale Medien
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  • 104
    Digitale Medien
    Digitale Medien
    Springer
    Journal of pharmacokinetics and pharmacodynamics 12 (1984), S. 413-436 
    ISSN: 1573-8744
    Schlagwort(e): methylene chloride ; pharmacokinetics ; physiological model ; hybrid model ; I.V. administrations ; mice
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract A physiologic mathematical model was developed to describe the time course of14C-methylene chloride (14CH2Cl2) distribution and elimination in mice following single i.v. administrations of 10 and 50mg/kg. A whole-body model was used to simulate14CH2Cl2 concentrations in blood and tissues, pulmonary clearance of unchanged14CH2Cl2, and metabolic conversion to14CO2 and14CO as monitored by the appearances of these metabolites in expired breath. This diffusion-limited model was identified via a sequential optimization scheme using hybrid models for each compartment. Pulmonary elimination of unchanged14CH2Cl2 was modeled as a linear process while hepatic metabolism of14CH2Cl2 to the compounds14CO2and14CO was described by a saturable metabolic rate term. The model adequately described the dose dependence in methylene chloride distribution and metabolism when simulations were compared to experimental data.
    Materialart: Digitale Medien
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  • 105
    Digitale Medien
    Digitale Medien
    Springer
    Journal of pharmacokinetics and pharmacodynamics 12 (1984), S. 451-461 
    ISSN: 1573-8744
    Schlagwort(e): rabbit ear chamber ; granulation tissue ; serum albumin ; sodium fluorescein ; Stokes-Einstein radius ; fluorescence ; photometric analysis ; vascular permeability ; renal clearance ; erythrocyte-free plasma layer ; two-compartment model ; pharmacokinetics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Plasma pharmacokinetics of sodium fluorescein, fluorescein isothiocyanate conjugated bovine serum albumin, and a graded series of dextrans of 19,400 to 71,800 MW were monitored continuously using a noninvasive photometric technique in individual blood vessels of tissue grown in a rabbit ear chamber. The data obtained were fitted with a two-compartment open model to obtain an effective permeability and an effective clearance. Both parameters decreased with increasing molecular radius for dextrans. Values for albumin were considerably less than expected on the basis of molecular radius, presumably due to the configuration, charge, and binding characteristics of albumin.
    Materialart: Digitale Medien
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  • 106
    Digitale Medien
    Digitale Medien
    Springer
    Journal of pharmacokinetics and pharmacodynamics 12 (1984), S. 351-365 
    ISSN: 1573-8744
    Schlagwort(e): pharmacokinetics ; model discrimination ; experiment design ; information theory
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The need for objective design of pharmacokinetic experiments aimed at model discrimination is argued. A sequential design strategy based on information theory is outlined. The characteristics of this strategy and its applicability to pharmacokinetic experiments is examined by means of computer simulated experiments. The limitations of the technique are discussed and alternative approaches outlined.
    Materialart: Digitale Medien
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  • 107
    Digitale Medien
    Digitale Medien
    Springer
    Journal of pharmacokinetics and pharmacodynamics 12 (1984), S. 119-128 
    ISSN: 1573-8744
    Schlagwort(e): teicoplanin ; pharmacokinetics ; three-compartment model ; noncompartmental analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The pharmacokinetics of teicoplanin, a new glycopeptide antibiotic active against gram-positive aerobic and anaerobic bacteria, was studied in adult male volunteers given 2- and 3- mg/ kg doses by a constant-rate 0.5-hr infusion. Serum and urine samples were collected up to 96 hr. Mean peak serum levels after the two doses were 15.7 and 22.4 μg/ml. Postinfusion serum teicoplanin levels showed triexponential decay. A three-compartment body model gave close values for pharmacokinetic parameters after the two doses. The mean half-life of the λ1 phase was 20.3 min, that of the λ2 phase was 2.9 hr, and the half-life of the estimated λ3 phase was 40.5 hr, in good agreement with that of the λZ phase (45.9 hr) calculated from the last urine data. The mean volume of distribution of the central compartment was 0.09 liter/kg and the steady-state volume of distribution using noncompartmental analysis was 0.84 liter/kg. Total clearance averaged 16.05 ml/hr/kg, with renal clearance arbout half this (9.51 ml/hr/kg), calculated by two different methods. The average total recovery of active teicoplanin in urine over 4 days was 52%, suggesting that both renal and nonrenal mechanisms are involved in elimination of the drug. The concentrations of teicoplanin in serum and urine exceeded the MIC (ranging from 0.02 to 2 μg/ml) on many pathogenic organisms for at least 1 day after administration.
    Materialart: Digitale Medien
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  • 108
    Digitale Medien
    Digitale Medien
    Springer
    Journal of pharmacokinetics and pharmacodynamics 12 (1984), S. 193-221 
    ISSN: 1573-8744
    Schlagwort(e): compartmental analysis ; identification ; Michaelis-Menten kinetics ; nonlinear systems ; pharmacokinetics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract This paper deals with aspects of the numerical identifiability of parameters of a model with a capacity-limited elimination rate using a single dose-response curve, namely, the prospects of being able to identify model parameters with any meaning from real data. The concept of linear bounds, first proposed by Tong and Metzler, is described and it is shown that if the Michaelis-Menten constant Km is greater than all the measured concentration values, approximation by a linear model is appropriate. At the other end of the scale, if Km is small compared with measured concentration values, the nonlinear response approximates to a zero-order curve.
    Materialart: Digitale Medien
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  • 109
    ISSN: 1573-0646
    Schlagwort(e): pharmacokinetics ; cytosine arabinoside ; delayed release ; arachis oil suspension
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary An attempt was made to create a delayed release preparation of cytosine arabinoside (araC) which could be administered subcutaneously, and would produce plasma levels similar to steady state infusion concentrations. A thixotropic suspension of araC in arachis oil and aluminium distearate was formulated. This preparation was similar to that previously used with bleomycin oil suspension and procaine penicillin. Two hundred mg/ml of araC in arachis oil containing varying amounts of aluminium distearate were administered firstly to New Zealand White rabbits and then to patients with acute myelogenous leukaemia. This preparation was well tolerated by both rabbits and patients but did not delay the release of araC from the subcutaneous tissues.
    Materialart: Digitale Medien
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  • 110
    Digitale Medien
    Digitale Medien
    Springer
    Chromatographia 18 (1984), S. 367-368 
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Open tubular (capillary) columns ; Variation of film thickness ; Thick-film columns ; Mass transfer terms
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary The factors characterizing the influence of the variation of the liquid phase film thickness on the mass transfer terms in the Golay equations describing the performance of open tubular columns are investigated and numerical values are given.
    Materialart: Digitale Medien
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  • 111
    ISSN: 1590-3478
    Schlagwort(e): Anticonvulsants ; phenytoin ; pharmacokinetics ; Michaelis-Menten kinetics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Sommario Il metodo di Mullen e Foster è stato applicato al fine di individualizzare la posologia della fenitoina in 24 pazienti epilettici. Le caratteristiche di precisione ed affidabilità del metodo sono state valutate confrontando le concentrazioni plasmatiche previste con quelle misurate sperimentalmente. La differenza percentuale tra valori e misurati della concentrazione plasmatica di fenitoina è risultata inferiore al 15 per cento in 22 casi su 35 (63 per cento), compresa tra il 15 e il 25 per cento in 8 casi su 35 (23 per cento), superiore al 25 per cento in 6 casi su 35 (17 per cento).
    Notizen: Abstract The Mullen and Foster method was prospectively applied for individualizing phenytoin dosage in 24 epileptic patients. Accuracy and reliability of the method were assessed by comparing predicted and measured values of plasma phenytoin steady-state concentration. The absolute difference between predicted and measured phenytoin levels was less than 15 percent in 22 of 35 cases (63 percent), between 15 and 25 percent in 8 of 35 cases (23 percent) and more than 25 percent in 6 of 35 cases (17 percent).
    Materialart: Digitale Medien
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  • 112
    Digitale Medien
    Digitale Medien
    Springer
    Chromatographia 18 (1984), S. 11-14 
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Cross-linked Stationary phase ; Immobilized Stationary phase ; Packed columns ; Trapping
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A coating of silicone SE-54 on Chromosorb W has been converted to an analytically stable, immobilized stationary phase layer by cross-linking with an organic peroxide. Up to 10% by weight has been applied in this manner. Excellent high temperature qualities are exhibited, such as low bleeding and good base line stability, during typical analyses. Poly (2,6-dimethyl-p-phenylene oxide) has also been crosslinked as a surface coating on Chromosorb W with an organic peroxide. From 3 to 4% by weight has been immobilized in this way. The resultant packing material, following high temperature conditioning, has been examined for use as an adsorbent of trace substances, similar to the applications to which such adsorbents as Tenax GC have commonly been applied, e.g. trace analysis of air. It appears to exhibit satisfactory properties for this analytical purpose.
    Materialart: Digitale Medien
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  • 113
    Digitale Medien
    Digitale Medien
    Springer
    Chromatographia 18 (1984), S. 21-22 
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Isopropylidene-glucose ; Glucose ; GC of TMS-derivatives
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary This paper describes the gas chromatographic separation of the mixture of di- and mono-O-isopropylidene-D-glucose and D-glucose as their trimethylsilyl derivatives. The use of OV-101 as liquid phase provides a complete separation for the all components in the mixture. Quantative analysis was performed using xylitol as the internal standard for di- and mono-O-isopropylidene-D-glucose, and sorbitol as the internal standard for α-and β-glucose.
    Materialart: Digitale Medien
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  • 114
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Nuclear magnetic resonance ; Terpenes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A procedure is described for recording1H NMR spectra of flowing gaseous GC fractions boiling as high as 200°C. The line width of the signals in the NMR spectra is smaller than 2.2Hz.
    Materialart: Digitale Medien
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  • 115
    Digitale Medien
    Digitale Medien
    Springer
    Chromatographia 18 (1984), S. 556-559 
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Liquid chromatography ; Tetramethrin ; Residues
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A method is described for the analysis of tetramethrin aqueous formulation and residues of tetramethrin on woolen cloth. The samples were extracted with acetonitrile and partitioned with benzene. Interferences were removed by liquid column chromatography with acid alumina and eluted with 10% ethyl acetate-hexane. Analysis was by gas chromatography with a 10% UCW98 (methylsilicone) column. Detection was made with the flame ionization detector to avoid the repeated dilutions necessary with use of the electron capture detector.
    Materialart: Digitale Medien
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  • 116
    Digitale Medien
    Digitale Medien
    Springer
    Chromatographia 18 (1984), S. 615-618 
    ISSN: 1612-1112
    Schlagwort(e): Gas chromatography ; Retention index ; Electric parameters ; Physico-chemical relationships ; Structure-retention study
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A new equation is derived relating the retention index to the molecular polarizabilities, ionization potentials and permanent dipole moments of the stationary phase and the solute. Various implications of this equation to quantitative structure-retention relationships are discussed.
    Materialart: Digitale Medien
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  • 117
    ISSN: 1612-1112
    Schlagwort(e): Aldehydes and ketones ; 2,4-dinitrophenylhydrazine-coated silica gel ; Gas chromatography ; Column liquid chromatography ; Pollution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary After a brief review of several methods described in the literature this paper discusses air-sampling on 2,4-dinitrophenylhydrazine-coated silica gel and identification requirements for aldehydes and ketones most commonly found in industrial pollution. Quantitative analysis of formaldehyde and acetaldehyde either by GC or by HPLC techniques is established using a dynamic system producing test atmospheres and compared with the usual colorimetric determinations.
    Materialart: Digitale Medien
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  • 118
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 140-141 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary columns ; Narcotics: street samples ; Narcotics, adulterants and diluents: simultaneous determination ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 119
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 274-276 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary column, glass ; Liquid-liquid and liquid-solid extraction ; Serum lipids ; Fatty acids ; Cholesterol and cholesteryl esters ; Triglycerides ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 120
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 280-281 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Reaction GC ; Iodination reactor ; Electron capture detection ; Trace analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 121
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 477-479 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Glass capillary column ; Adsorbent ; Cold trapping ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 122
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Packed and capillary columns ; Fungicides and insecticides ; Adsorption ; Length of column ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 123
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 536-537 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary column ; On-Column injection ; Vaporizing injection ; Decomposition ; α-Ferrocenyl carbinols ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 124
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 504-508 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Fused silica capillary columns ; GC/MS/DS ; Cryotrapping and cryofocussing of organics ; Purgeable compound analysis ; Trace organic analysis ; Priority pollutants ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The purge and trap (P&T) method of analysis has been interfaced with fused silica capillary column gas chromatography. This interfacing has been accomplished without splitting the P&T trap desorption carrier gas. Thus, 100% of the purged compounds are transferred to the column. The analytes are cryofocussed on the column using whole column cryotrapping (WCC) at -80°C. The resulting P&T/WCC procedure is extremely well-suited to the analysis of trace purgeable aqueous organic compounds. Samples and standards containing a variety of aromatic standard compounds were analyzed. The standards included benzene, toluene, ethylbenzene, xylenes, C3-C4-benzenes, and naphthalene, as well as three P&T internal standard compounds. Chromatographic peak widths were uniformly less than 6 s at the base and excellent precision was obtained in the relative retention time data for all compounds. The chromatogram of a groundwater sample contaminated with aromatic gasoline compounds is also presented. Since P&T/WCC works well with fused silica capillary columns, the full sensitivity and chromatographic efficiency of capillary gas chromatography is made available to P&T analyses.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 125
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 542-544 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Fused silica (capillary) columns ; Bonded (cross-linked) phases ; Hydrocarbon analysis ; Olefinic hydrocarbons ; Retention index data ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
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  • 126
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 142-143 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Solute focussing ; Solvent effect ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 127
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 329-332 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Fused silica capillary columns ; Deactivation ; Polymethylhydrosiloxanes ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 128
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 338-339 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Pesticides ; Multidetection ; ECD-NPSD-SSD ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 129
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary columns ; Thick liquid phase films ; Natural and refinery gases ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Capillary columns having a thick liquid phase film and a low phase ratio permit the separation of low molecular mass compounds which would have a very small capacity factor on columns with a classical thin film. At the same time, the increased sample capacity allows conventional hot-wire thermal conductivity detectors to be used with such columns. The analysis of natural and refinery gases, containing both inorganic compounds and light (C1—C7) hydrocarbons, utilizing a combination of hot-wire and flame ionization detectors, is demonstrated.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
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  • 130
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 382-388 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary columns ; HETP equation ; Optimum column parameters ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: An HETP equation for the capillary column is developed that takes into account the dependence of gaseous diffusion on pressure, the compressibility of the mobile phase, together with the unique relationship between mobile phase velocity, and the resistance to mass transfer in the stationary phase. The equation is used to develop a procedure for column optimization and expressions are derived that allow the optimum column radius and optimum column length to be calculated for a given fixed inlet pressure. It is shown that fast, simple separations are optimally achieved using relatively short small diameter columns. Conversely, optimum performance for the separation of complex mixtures requiring higher efficiencies requires the use of long columns with relatively large diameters.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
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  • 131
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 431-432 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary columns ; Triglycerides ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 132
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 389-397 
    ISSN: 0935-6304
    Schlagwort(e): Low and high resolution liquid chromatography ; Gas chromatography ; Capillary columns ; Alkali flame detection ; Chemical ionization mass spectrometry ; Nitro-PAHs ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: An analytical procedure is described for the fractionation of organic compounds present in environmental samples and the determination of nitro polyaromatic hydrocarbons (nitro-PAHs). Both low and high resolution liquid chromatography are employed for the prefractionation of the soluble organic fraction (SOF) extracted from particulate matter or gaseous pollutants collected on adsorption traps. High resolution gas chromatography is used to analyze four fractions containing alkanes, PAHs, nitro-PAHs, and other polar PAHs. Nitrogen-containing species are separated by GC and detected specifically using an alkali flame (NPD) detector. Flame ionization (FID) detection, GC-MS of positive ions, and negative ion chemical ionization MS of the whole fraction is used for the identification and quantitation of the various components. The composition of SOF extracted from particulate matter emitted from diesel exhausts is elucidated and a large number of nitro-PAHs identified by the combination of the various techniques.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
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  • 133
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 700-701 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Glass capillary columns ; Immobilization ; 60Co gamma radiation ; Medium-polarity phase ; OV-1701-Vi ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 134
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 185-190 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary columns ; Mass spectrometry ; Dynamic headspace ; Deans switching ; Cold trap ; Reinjection ; Polymers ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: An experimental method for the analysis of volatile organic compounds in polymers is described. The technique involves dynamic headspace sampling, collection, and concentration of the volatiles in a cold trap, followed by capillary column gas chromatography/mass spectometry. Flow switching is carried out by the Deans switching technique. Four technical polymers used as pharmaceutical packaging materials have been analyzed in order to demonstrate the method.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
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  • 135
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 215-217 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary, fused silica ; Coupled columns ; Halogenated organic pollutants ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 136
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 222-224 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Interface ; Partition ; Adsorption ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 137
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 282-283 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Gas analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 138
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 306-311 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary columns ; Thermodesorption ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A commercial thermodesorption and cold trap unit can be used as a large sample volume injection device in high resolution gas chromatography. Volumes of more than 100 μl can be injected. More than 97% of solvents, such as hexane, can be removed by a Tenax TA precolumn without any loss of compounds with volatilities comparable to naphthalene. Experimental conditions, recovery rates of polycyclic aromatic hydrocarbons, and the reproducibility of the method are described in detail. The method was successfully applied for the determination of PAH in air particulate matter extracts.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 139
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 334-335 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Fused-Silica columns ; Thermal stability ; Dibenzothiophene oxides ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 140
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 340-342 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Sample preparation ; Closed loop stripping analysis ; Charcoal adsorbent filter ; Overcoming contamination ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 141
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 370-374 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Trace analysis ; On-column injection ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Large sample volume on-column injection (up to 250 μL) of n-pentane solutions of halogenated hydrocarbons has been employed for the direct measurement of both low-boiling and high-boiling compounds in what is essentially a single run. Two-bonded phase, fused-silica capillary columns are joined in series, through which the low-boiling compounds are first chromatographed and detected with an electron capture detector. High-boiling compounds are then trapped in a section joining the two columns, and subsequently chromatographed in the second column, using the same detector. This procedure permits analysis at the ppt level.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
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  • 142
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 404-410 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Multidimensional capillary columns ; Enantiomeric separations ; Intermediate trapping ; Mixed polarities ; Terpene alcohols ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 143
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 533-536 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary columns ; Fungicides and insecticides ; Sensitivity limits ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 144
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 68-73 
    ISSN: 0935-6304
    Schlagwort(e): MS-MS ; Gas chromatography ; Capillary GC-ECD, GC-MS, GC-MS-MS ; Bleaching ; Chlorine compounds ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Gas chromatography (GC) with electron capture detection (ECD), GC combined with mass spectrometry (MS), GC with multi-stage mass spectometry (MS-MS), and direct inlet MS-MS have been used to determine 1,1-dichlorodimethyl sulfone (DDS) in aquatic organisms in the receiving waters outside a pulp mill bleach plant. Both GC-MS-MC and direct inlet MS-MS of tissue extracts of fish and mussel appear to be sensitive, selective, and rapid analytical techniques for the determination of DDS.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
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  • 145
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary column ; HPLC prefractionation ; MS ; ECD ; Substituted PAHs ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A method is described which allows the determination of different substituted polycyclic aromatic hydrocarbons (PAH) such as NO2-PAH, carbazoles, keto-PAH, and aza-arenes in aerosol samples. Liquid CO2-extraction is used to minimize the loss of reactive compounds. High performance liquid chromatography on chemically activated silica is employed to prefractionate the samples into subfractions with a minimum of overlap between different PAH compound classes. Both electron capture detection and negative ion chemical ionization combined with capillary gas chromatography are used for identification and quantification. The latter method also allows distinction between isomers with different toxic properties when N2O/CH4 reaction gas mixtures are used. Selectivity for tetrachlorodibenzo-p-dioxins as against pesticides and polychlorinated biphenyls can be improved by this technique. The applicability of the method is critically discussed and different examples are given.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
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  • 146
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 89-92 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary column ; Stationary phase ; Polysiloxane ; Autocrosslinkable ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Methyl-2-phenylethylpolysiloxane polymers have been synthesized for comparison with methylphenylpolysiloxane stationary phases for gas chromatography. The 50% 2-phenylethyl polysiloxane was found to be autocrosslinkable at 260°C without addition of free redical initiator. Although the selectivity of this phase appears to be similar to the 50% phenyl polysiloxane, its thermal stability is not as high.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 147
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 92-94 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary column ; Solute focusing ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 148
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Mass spectrometry ; Capillary GC ; Fused silica GC ; 6-Nitrobenzo[a]pyrene ; 3-Nitrobenzo[a]pyrene ; 1-Nitrobenzo[a]pyrene ; 3-Nitrobenzo[e]pyrene ; Nitro-PAHs ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 149
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 33-37 
    ISSN: 0935-6304
    Schlagwort(e): Chlorinated paraffins ; Gas chromatography ; Mass spectrometry ; Negative ion ; Chemical ionization ; Capillary column ; On-column injection ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Although chlorinated paraffins (CP) are produced in large amounts (300 000 tonnes per year), little is known about their occurrence in the environment due to the lack of specific and sensitive analytical methods. The present paper describes the GC/MS analysis of different CP's using capillary gas chromatography with on-column injection and negative ion chemical ionization (NCI) mass spectrometry. Chromatographic resolution of groups of isomers and homologues was obtained. The chromatograms and mass spectra are discussed. The suitability of this method for trace analysis of a CP sample using multiple ion detection (MID) is described.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 150
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 48-48 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary, glass ; Carrier gas flow controller unit ; On-column injection ; Sample, loading onto column ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 151
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 540-541 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary ; SDE enrichment ; Fatty acids ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 152
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Immobilized capillary columns ; Aqueous solutions ; On-column injection ; Split injection ; Multidimensional separations ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Various methods of gas chromatographic analysis at high resolution and low detection limits in aqueous solutions are described with regard to sampling techniques, column technology, and the application of coupled pre-columns, also including multidimensional methods. Immobilized polyethylene glycol (Carbowax 20 M) columns have also been produced and used successfully.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 153
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 13-18 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary columns ; Biphenyl polysiloxane ; Stationary phase ; Polarizable phase ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A crosslinkable biphenylmethylpolysiloxane stationary phase was synthesized for capillary column gas chromatography and compared with methyl, phenyl, and cyanopropyl polysiloxane stationary phases for the separation of isomeric polycyclic aromatic compounds. While the new phase gave similar separations of nonpolar isomers when compared to the nonpolar phases, separations of polar isomers were greatly improved because of the induced polarity of the biphenyl group of the stationary phase by the solute molecules. This polarizable stationary phase offers a unique selectivity which is not available in other stationary phases.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
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  • 154
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 19-24 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary, fused silica ; Splitless injection ; Flash derivatization ; Quaternary ammonium compounds ; Acetylcholine ; Biogenic amines ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A conventional splitless injector is used as a pyrolysis chamber or chemical reactor for the N-demethylation of acetylcholine and other choline esters. The novel uses of 2-aminoethanol as a N-demethylation reagent in splitless injection and bonded-phase fused silica capillary columns in the separation of the tertiary amine derivatives of choline esters are described. A comparison is made between non-polar and moderately polar fused silica capillary columns in the separation of choline esters.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 155
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 25-32 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; CGC-ECD, CGC-MS ; Chlorophenols ; Chlorophenoxyalkanoic acids ; Neutral chlorinated compounds ; Biological sewage treatment plant ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The environmentally hazardous organic substances in the waste water from the manufacture of chlorophenoxyalkanoic acids have been identified and semiquantified before and after passing through a biological treatment plant for municipal sewage, the secondary effluent of which is discharged into a marine ecosystem. The organics belong to three groups: (i) chlorophenols; (ii) chlorophenoxyalkanoic acids; and (iii) chlorinated neutrals. The removal of chlorophenols and phenoxyalkanoic acids was shown to be good, with a 90% overall reduction of chlorinated substances in the sewage passing through the treatment plant. The lowest reduction occurred for the polychlorinated compounds. Two chlorobenzofurans among the chlorinated neutrals were preliminarily identified.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 156
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 137-139 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Deactivated fused silica tubing ; Zero dead volume union ; Capillary column GC/MS interface ; Test mixture for non-polar columns ; Test mixture of phenols ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 157
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 144-146 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary column ; Cyclopentolate ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 158
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 148-150 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary columns ; On-column injection/enrichment ; Milliliter sample volumes ; Trace analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 159
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 191-195 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Saturated hydrocarbons ; Retention indices ; Molar refraction ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Kováts retention indices for a series of linear, branched, and cyclic alkanes on squalane at any temperature, and on other stationary phases of different polarity at a given temperature, are related to physicochemical properties of the solutes, such as boiling point and molar refraction, by multiple regression analysis. The equations found permit calculation of the Kováts retention index for all alkanes, with standard deviations close to experimental error. The same equations can also be used for calculating the physicochemical parameters they contain.
    Zusätzliches Material: 8 Tab.
    Materialart: Digitale Medien
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  • 160
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 209-210 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Solvent effect ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 161
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 212-214 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Trace analysis ; Solvent effect in GC ; Parts per trillion ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 162
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 270-273 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary column ; Temperature-programmed analysis ; Retention indices ; Polychclic aromatic hydrocarbons (PAH) ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 163
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 284-285 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary columns ; Fruit juices ; Amino acids ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 164
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 332-333 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary columns ; Polarity mixtures ; Reaction products ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 165
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 414-422 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary columns ; Steroid analysis ; Sample pretreatment ; Sample introduction ; Separation speed ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Quantitative analysis of steroids and their metabolites in urine samples calls for increased speed of sample clean-up, of the derivatization procedure, and of separation. A fast procedure for sample pretreatment, which can be performed within 8 hours, is introduced and evaluated. It is shown that use of fast pretreatment in combination with narrow bore columns, which are compatible with existing instrumentation, can considerably increase, laboratory throughput. The effect of different sample introduction techniques (e.g. splitless, on-column, and moving needle) on column efficiency and resolution is demonstrated and discussed.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
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  • 166
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 487-489 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary column ; Multi-dimensional technique ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
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  • 167
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 492-494 
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary, glass ; Closed loop stripping analysis ; Filter extraction ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 168
    Digitale Medien
    Digitale Medien
    Springer
    Bulletin of experimental biology and medicine 98 (1984), S. 1183-1185 
    ISSN: 1573-8221
    Schlagwort(e): ethanol ; pharmacokinetics ; blood ; serotonin ; dopamine ; noradrenalin ; brain ; CBA and C57Bl/6 mice
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Materialart: Digitale Medien
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  • 169
    Digitale Medien
    Digitale Medien
    Springer
    Bulletin of experimental biology and medicine 98 (1984), S. 1226-1227 
    ISSN: 1573-8221
    Schlagwort(e): pharmacokinetics ; alcohol ; isolation ; stress
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Materialart: Digitale Medien
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  • 170
    ISSN: 0570-0833
    Schlagwort(e): Chiral resolution ; Analytical methods ; Gas chromatography ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: If a stationary phase A employed in gas chromatography possesses a chemical affinity for substance B, which is to be separated, then the retention behavior is not only determined by the normal physical equilibrium between the gas and liquid phases but also by the chemical equilibrium A + B ⇋ AB. If A and B are chiral and A is present in optically active form while B is a racemic mixture, then it is possible to achieve a gas chromatographic enantiomer resolution without the isolation of diastereomers: the energetically different diastereomeric associates AR BR and AR BS are formed rapidly and reversibly. This enantiospecific resolution principle was first demonstrated in 1966 by the quantitative resolution of racemic amino acid derivatives on optically active peptide phases in analogy to the well-known stereospecificity of enzymes. The anchoring of the chiral resolving agent to thermally stable polysiloxanes together with the employment of high resolution capillary columns and the use of appropriate derivatization strategies has led to the development of enantiomer resolution into a routine modern method for many classes of substances. The demonstration of enantiospecificity in the gas chromatographic separation process is of fundamental interest, and its systematic study can result in a significant contribution to the understanding of the molecular mechanism of “chiral recognition”. The gas chromatographic separation of enantiomers has also proven to be an accurate and sensitive method for the determination of the enantiomeric composition of natural products and products of enantioselective transformations (asymmetric syntheses, “chiral pool” transformations, kinetic resolutions, biomimetic reactions) and for the quantification of racemization, e.g. in the synthesis and hydrolysis of peptides. In any research program devoted to the phenomenon of chirality, the gas chromatographic separation of the enantiomers of volatile compounds constitutes an indispensable modern instrumental technique.
    Zusätzliches Material: 11 Ill.
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  • 171
    Digitale Medien
    Digitale Medien
    Springer
    European journal of nutrition 22 (1983), S. 14-26 
    ISSN: 1436-6215
    Schlagwort(e): branched chain α-keto acids ; 4-methyl-2-oxopentanoate, 3-methyl-2-oxopentanoate ; 3-methyl-2-oxobutyrate ; dehydrogenation ; transamination ; pharmacokinetics ; absorption
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Michaelis-Konstanten und Aktivitäten von Dehydrogenasen und Transaminasen der drei verzweigten α-Ketosäuren Keto-Valin, Keto-Leucin und Keto-Isoleucin in Leber, Niere, Skeletmuskel und Gehirn von Ratten werden mitgeteilt. Nach oraler Zufuhr passieren nur 11–22% der Ketosäuren unverändert die Leber. Aus pharmakokinetischen und Resorptions-Untersuchungen erhaltene Blutspiegel an Ketosäuren werden zu den Michaelis-Konstanten in Beziehung gesetzt. Bei den geringen Konzentrationen an Ketosäuren nach oraler Zufuhr kann angenommen werden, daß die oxidativen Prozesse in den nichthepatischen Geweben über die Transaminierung überwiegen. Daten über die Wachstumseffizienz von verzweigtkettigen α-Ketosäuren im Vergleich zu den entsprechenden Aminosäuren stimmen mit dieser Vorstellung überein. Bei intravenöser Verabreichung müßten die Voraussetzungen für Transaminierung besser sein als nach oraler Zufuhr. Auf der Basis von Daten aus der Literatur werden die Übertragbarkeit unserer Befunde auf den Menschen und die verschiedenen Faktoren, welche die Effizienz der verzweigten α-Ketosäuren durch Einwirkung auf ihren Stoffwechsel beeinflussen können, diskutiert.
    Notizen: Summary Miehaelis-constants and enzyme activities for dehydrogenation and transamination of the three branched chainα-keto acids in liver, kidney, skeletal muscle, and brain of rats are reported. After oral load only 11–22 % of the keto acids pass the liver unchanged. Blood levels in pharmacokinetic and absorption studies are related to the Michaelis-constants. At the low keto-acid concentrations after oral application, dehydrogenation in the non-hepatic tissues is supposed to prevail over transamination. Data on feed efficiency of branched chain α-keto acids reported in the literature support this view. The chance for transamination is better after intravenous administration. The transferability of our data to humans, and various factors influencing the efficiency of branched chain α-keto acids are discussed in connection with data reported in the literature.
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  • 172
    Digitale Medien
    Digitale Medien
    Springer
    Entomologia experimentalis et applicata 34 (1983), S. 20-26 
    ISSN: 1570-7458
    Schlagwort(e): Dioryctria abietella ; Cone pyralid ; Lepidoptera ; Pyralidae ; Sex pheromone, (Z,E)-9,11-tetradecadienyl acetate ; Single sensillum recordings ; Electroantennography ; Gas chromatography ; Mass spectrometry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Beschreibung / Inhaltsverzeichnis: Résumé L'analyse en chromatographie gazeuse associée à une détection électroantennographique a montré que l'acétate (Z,E)-9,11-tétradécadiényle (Z,E)-9,11–14:Ac est l'un des composants de la phéromone de Dioryctria abietella Schiff (Lepid.: Pyralidae). Couplage chromatographie en phase gazeuse spectrometrie de masse a montré la présence d'acétate tétradécadiényle avec un spectre de masse et un indice de rétention identiques au Z,E-9,11–14:Ac Un récepteur cellulaire sensible à la fois au Z,E-9,11–14:Ac et à un extrait de la femelle a été identifié sous l'antenne du mâle. Les analyses des antennogrammes et de la cellule isolée ont étayé la caractérisation du composant de la phéromone comme étant Z,E-9,11–14:Ac. Un récepteur cellulaire additionnel sensible à l'acétate (Z.)-9-tétradécadiényle et à l'acétate (Z.E.)-9,12-tétradécadiényle a été trouvé sur l'antenne du mâle, mais il n'était pas activé par l'extrait de la femelle. Sur le terrain Z,E-9,11–14:Ac, présenté seul, attirait des nombres importants de mâles de D. abietella. L'addition de l'acétate (Z)-9-tétradécényle a inhibé l'attraction des mâles par les pièges.
    Notizen: Summary Gas chromatographic analyses coupled with electro-antennographic detection indicated that (Z,E)-9,11-tetradecadienyl acetate (Z,E-9, 11–14:Ac) is a pheromone component of the cone pyralid Dioryctria abietella. Gas chromatographic-mass spectrometric analyses confirmed the presence of a tetradecadienyl acetate with mass spectrum and retention index identical to Z,E-9,11–14:Ac. A receptor cell sensitive to both Z,E-9,11–14:Ac and the female extract was identified on the male antenna. An additional receptor cell sensitive to (Z)-9-tetradecenyl acetate and (Z,E)-9,12-tetradecadienyl acetate was found on the male antenna but was not activated by the female extract. In the field Z,E-9,11–14:Ac presented alone attracted significant numbers of male D. abietella. Addition of (Z)-9-tetradecenyl acetate inhibited the attraction of males to traps.
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  • 173
    ISSN: 1432-2072
    Schlagwort(e): Halazepam ; Desmethyldiazepam ; Benzodiazepines ; Pharmacokinetics ; Gas chromatography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Halazepam and its major metabolite desmethyldiazepam (DMDZ) can be reliably quantitated in human plasma following single doses of halazepam. After addition of appropriate internal standards, halazepam and DMDZ are extracted directly into an organic solvent at physiological pH. The organic extract is separated, evaporated to dryness, reconstituted, and directly chromatographed using a 50:50 methyl:phenyl silicone column (SP-2250) and an electron-capture detector. After a single 40 mg oral dose of halazepam, the parent compound appears in plasma only transiently and at low levels. DMDZ appears in higher concentrations and is slowly eliminated. During multiple-dose therapy with halazepam, DMDZ will be the major active substance in blood.
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  • 174
    ISSN: 1432-0428
    Schlagwort(e): Type 1 diabetes ; insulin ; insulin antibody ; pharmacokinetics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Insulin withdrawal studies were performed in 12 Type 1 (insulin-dependent) C-peptide negative diabetic patients with low to moderate insulin antibody levels, to assess the biological availability of antibody-bound insulin and its clinical significance. There was a highly significant correlation between the extent to which the free insulin concentration was maintained during the period of insulin withdrawal and both the level of insulin-binding by serum and the total insulin concentration at the start of the study. During insulin withdrawal, the patients who best maintained their circulating free insulin levels showed the smallest increases in blood glucose and 3-hydroxybutyrate concentrations. We conclude that antibody-bound insulin is available for physiological action, and that in those individuals with moderate antibody concentrations it is capable, in the fasting state, of maintaining free insulin levels. In these circumstances insulin antibodies are behaving as simple carrier proteins.
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  • 175
    Digitale Medien
    Digitale Medien
    Springer
    International archives of occupational and environmental health 53 (1983), S. 101-108 
    ISSN: 1432-1246
    Schlagwort(e): Biological exposure test ; Exercise ; Gas chromatography ; Hippuric acid ; Humans ; Isotachophoresis ; Laboratory exposure ; o-Cresol ; Rest ; Toluene ; Urine
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The urinary excretion of hippuric acid and o-cresol was studied after respiratory exposure of human volunteers to approximately 80 ppm (306 mg/m3 ± SD 13) of toluene for 2 h under different work loads (0, 50,100, 150 W, respectively, during 30-min periods). The diet before and after exposure varied. An isotachophoresis method for the determination of hippuric acid is described. The correlation between the total urinary excretion, excretion rate and concentration of hippuric acid, and the respiratory uptake of toluene was poor or non-existing. The same was true for the excretion of o-cresol, which 4 h after exposure was concluded amounted to 0.03–0.26% of the toluene uptake. Thus, after a short-time exposure neither metabolite proved to be a reliable measure of individual toluene uptake at varying workloads or food intake in combination with low exposure levels.
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  • 176
    ISSN: 1432-1238
    Schlagwort(e): Gas chromatography ; Head-space analysis ; CCl4 intoxication ; Hyperventilation therapy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract A head-space gas chromatographic method for the determination of carbon tetrachloride in human blood is described. Standard samples with 0.5 ml whole blood containing different concentrations of CCl4 were analyzed at column temperatures ranging from 50° to 90°C. Advantages of this method include high sensitivity, simplicity in handling, rapid achievement of reliable results, accuracy and low costs. The practicability of this analytical method was studied in a patient following suicidal oral ingestion of a lethal dose of carbon tetrachloride.
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  • 177
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 24 (1983), S. 185-190 
    ISSN: 1432-1041
    Schlagwort(e): amezinium ; hypotension ; antihypotensive drug ; ECG ; concentration-effect relationship ; pharmacokinetics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary Blood pressure, ECG and plasma concentration were determined for up to 12h following single i.v. (10 mg) and oral (20 mg) doses of amezinium (Regulton®) in 8 healthy, male volunteers. The i.v. and oral doses were almost equi-active in significantly increasing systolic blood pressure (SBP) by 14.5 and 15.6 mmHg, respectively. The maximum SBP after the i.v. dose was reached after 45 min, and 105 min after oral administration. The heart rate fell reflexly. The increases in mean and diastolic blood pressures were not significant. Pulse pressure was enhanced after both i.v. and oral administration. The effect on systolic blood pressure lasted for about 4 h. There was a slight shortening of the QTc duration, which could not be explained as a drug effect. Other ECG time intervals were not altered. Multiple regression analysis showed a significant positive correlation between the log plasma concentration and the increase in SBP between 0.5 and 5 h after oral administration (r=0.78,p〈0.001) and between 0.75 and 5 h after i.v. administration (r=0.83,p〈0.001). 30 min after amezinium p.o. the mean SBP began to rise, when a plasma level of about 30 ng/ml was reached.
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  • 178
    ISSN: 1432-1041
    Schlagwort(e): sulfinpyrazone ; pharmacokinetics ; metabolites ; inhibition of platelet aggregation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary The pharmacokinetics of sulfinpyrazone, and the plasma levels of its sulfide and sulfone metabolites, have been determined after a single oral dose (400 mg) and during steady-state conditions (4×200 mg daily for 6 days) in healthy female volunteers. The plasma half-lives of sulfinpyrazone, the sulfone and the sulfide were 3.7, 3.2 and 14.7 h, respectively, during steady-state. After a single dose and during steady state conditions the half-lives of sulfinpyrazone and the sulfone did not differ significantly. The trough plasma levels of the sulfide metabolite exceeded those of the parent compound in four of the six volunteers on the last day of the study. The data suggest that in man the most likely candidate for the prolonged inhibition of platelet aggregation observed after treatment with sulfinpyrazone is its sulfide metabolite, because of its prolonged elimination.
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  • 179
    ISSN: 1432-1041
    Schlagwort(e): trimethoprim ; sulphadiazine ; urinary tract infection ; children ; pharmacokinetics ; urinary concentrations
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary The clinical effect and pharmacokinetics of the combination trimethoprim (TMP)-sulphadiazine (SD) were studied in 18 children with acute urinary tract infections (UTI), aged 2–56 months. A suspension of TMP-SD (9+41 mg/ml) was taken orally twice daily for 10 days. Various doses of TMP (2.9–3.7 mg/kg/day) and SD (12.9–16.7 mg/kg/day) were also given to children of different ages. After 2–4 days of treatment, bacterial cultures of urine were negative and C-reactive protein in serum, WBC count and ESR in all patients had become normal. Steady state serum levels for both components were reached after 4 or more days of treatment. At steady state, mean peak serum concentrations of TMP and SD of 1.4 µg/ml and 27 µg/ml, respectively, were found within 2–4 h after a fasting morning dose. The biological half-lives of TMP and SD were of the same order of magnitude, but the total clearance of TMP was 5 times greater than that of SD. The concentrations of TMP-SD in urine were invariably more than 10 times the minimum inhibitory concentrations (MIC) for the causative organisms (tested at the ratios 1:20 and 1:4 of TMP and SD). Non-metabolized SD constituted 77% of total SD in urine of infants, and 55% of total SD in children of 1 year or more. The TMP-SD combination showed a satisfactory clinical effect and favourable pharmacokinetic properties in children with UTI.
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  • 180
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 24 (1983), S. 337-343 
    ISSN: 1432-1041
    Schlagwort(e): ketamine ; diazepam ; drug interaction ; pharmacokinetics ; premedication ; clorazepate ; drug metabolism ; enzyme induction
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary Anaesthesia with continuous i.v. ketamine and 65% nitrous oxide in oxygen was given to a total of 49 patients undergoing major abdominal surgery. A control group was premedicated with atropine and other groups received in addition rectal diazepam or clorazepate i.v. Four further patients had been on oral diazepam or barbiturates for 1–14 years; as premedication they received atropine alone. The anaesthetic technique gave good operative conditions in the 4 groups of patients. The haemodynamic stimulation of ketamine was significantly reduced in patients premedicated with diazepam. Psychotomimetic side effects were not prominent in any of the groups. Patients premedicated with diazepam required a lower rate of ketamine infusion as compared to controls during the initial 30 min of anaesthesia. The patients in the other groups did not differ from the control group in this respect. There were large differences in metabolic pattern between the groups. As compared to the controls, the patients on long-term diazepam or barbiturates had high concentrations of hydroxylated metabolites, with levels higher than that of norketamine. The patients pretreated with diazepam had very low plasma levels of hydroxylated metabolites. Clorazepate premedication did not significantly affect the metabolism of ketamine. The biological half-life of ketamine was significantly increased in the diazepam-treated group, and it was shortened in those on long term treatment with barbiturates or diazepam.
    Materialart: Digitale Medien
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  • 181
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 24 (1983), S. 485-494 
    ISSN: 1432-1041
    Schlagwort(e): amiodarone ; pharmacokinetics ; therapeutic serum level ; thyroid function ; antiarrhythmic therapy ; adverse effects
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary In 17 patients on long term therapy with amiodarone, serum drug levels measured by HPLC were related to pharmacological effects. At steady state, serum levels were directly proportional to the dose, 5 mg/kg per day leading to an average serum level of approximately 2.5 µmol/l. The non-amiodarone level of iodine averaged 4-times higher than the level of amiodarone iodine. The elimination half-life of amiodarone ranged from 21 to 78 days, and of non-amiodarone iodine from 24 to 160 days. Control of arrhythmias was satisfactory in all 12 evaluable patients, when the serum amiodarone level exceeded 1.5 µmol/l. Deterioration of vision and polyserositis occurred only at amiodarone levels above 4 µmol/l. Tentatively, a therapeutic range of 1.5 to 4 µmol/l is proposed. In contrast, thyroid dysfunction was observed at any amiodarone level. In view of the narrow therapeutic window, therapy with amiodarone may be optimized by monitoring its serum level and in addition, thyroid function should be regularly checked.
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  • 182
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 24 (1983), S. 521-524 
    ISSN: 1432-1041
    Schlagwort(e): sotalol ; beta-adrenoceptor antagonist ; pregnancy ; pharmacokinetics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary Sotalol, a beta-adrenoceptor blocking drug, was administered to 6 healthy pregnant volunteers between 32–36 weeks gestation and when at least 6 weeks post-partum. On both occasions, each volunteer was given sotalol 100 mg intravenously and 400 mg orally in randomised order with at least a 1 week washout period between. Plasma samples were analysed for sotalol using a fluorometric method and the pharmacokinetic profiles investigated. The systemic clearance of sotalol was significantly greater in the antenatal period (2.4±0.3 ml/min/kg) than in the post-natal phase (1.5±0.1 ml/min/kg). The apparent volume of distribution was similar in the two periods: the elimination half-life was 6.6±0.6h ante-natally and 9.3±0.7h post-natally after intravenous drug but the trend for faster elimination was not significant. The elimination half-life after oral administration (about 10h) and bioavailability (about 90%) were not altered significantly by pregnancy. It is suggested that the more rapid clearance of sotalol in pregnancy may be due to increases in renal plasma flow and glomerular filtration rate.
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  • 183
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 24 (1983), S. 549-556 
    ISSN: 1432-1041
    Schlagwort(e): dibromosulfophthalein ; pharmacokinetics ; plasma levels ; urinary excretion ; biliary excretion ; biliary fistula ; enterohepatic circulation ; hepatic transport test
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary The pharmacokinetics of dibromosulfophthalein (DBSP), the 3,6-dibromo analogue of BSP, was studied in 7 patients with a biliary fistula, 52 h after cholecystectomy, and in 6 gynaecological patients with an indwelling urethral catheter, following extirpation of the uterus i.e. with an intact enterohepatic circulation. Plasma protein binding determined by ultrafiltration was 98–99% up to a concentration of 700 µg/ml. After an intravenous bolus injection of DBSP 5 mg/kg, a biexponential plasma decay was found in both groups, with a rapid initial t1/2 of 2–6 min and a slow secondary phase of 33–109 min (mean 66 min) in the cholecystectomy patients, and 10–30 min (mean 19 min) in the gynaecological patients. The biliary excretion rate varied considerably between the patients and was highly correlated with bile flow. Biliary output amounted to a maximum of 86% of the dose in 24 h. The excretion rate curves showed ascending and descending phases, the mean terminal t1/2 being 65 min. Urinary excretion was 3–11% of the dose in 8 h in the gynaecological patients (mean 6%) and 6–31% in the cholecystectomy group (mean 16%). Renal clearance of unbound DBSP was about ten-times greater than the glomerular filtration rate, which indicates tubular secretion. A two compartment model with elimination from the peripheral and central compartments was selected because of these data. Analysis of the plasma-disappearance curves indicated an initial plasma clearance of 500–600 ml/min, which suggests that hepatic uptake will be very dependent on flow. Steady state (biliary) clearance was about 400 ml/min in the gynaecological group and approximately half that in the cholecystectomy patients; V1 tended to be higher and V2 to be lower in the latter group. It is concluded that biliary excretion rate of DBSP in patients with a biliary fistula is probably depressed by the postoperative bile drainage and the lack of enterohepatic cycling of bile salts.
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  • 184
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 24 (1983), S. 661-665 
    ISSN: 1432-1041
    Schlagwort(e): hydrochlorothiazide ; pharmacokinetics ; renal failure ; dosage adjustment ; excretory mechanism
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary The pharmacokinetics of hydrochlorothiazide (HCT) was investigated in 23 subjects with normal renal function or widely varying degrees of renal failure. The half-life of elimination increased from 6.4 h in subjects with normal renal function to 11.5 h in patients with mild renal impairment (endogenous creatinine clearance between 30 and 90 ml/min), and to 20.7 h in patients with an endogenous creatinine clearance below 30 ml/min. The cumulative urinary excretion and the renal HCT clearance were correspondingly reduced in patients with impaired kidney function. In normal subjects HCT was mainly excreted by tubular secretion, but as renal HCT clearance in patients with renal impairment did not differ significantly from endogenous creatinine clearance, it was concluded that the secretory mechanism is most markedly impaired. In patients with an endogenous creatinine clearance of 30 to 90 ml/min, the dosage of HCT should be reduced to 1/2 and in patients with a endogenous creatinine clearance below 30 ml/min to 1/4 of the normal daily dose to avoid dose dependant side-effects.
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  • 185
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 24 (1983), S. 813-818 
    ISSN: 1432-1041
    Schlagwort(e): dihydroergotamine ; dextran 70 ; pharmacokinetics ; radioimmunoassay ; drug interaction
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary The pharmacokinetics of subcutaneous dihydroergotamine (DHE) with or without dextran 70 infusion was evaluated in a single- and multiple-dose study in 30 patients. Radioimmunoassay was used to measure plasma DHE and the anthrone method to determine the dextran concentration. In the single-dose study no significant interaction between DHE and dextran was noted with respect to their plasma levels. The absorption of s.c. DHE was rapid and the disappearance curve followed a biphasic pattern, t0.5 α being 1.4 and 2.0 h, t0.5 β 22 and 21 h for DHE and DHE/dextran 70, respectively. In the multi-dose study the trough level of DHE initially had a tendency to rise, in accordance with simulated plasma concentration curves. DHE trough levels were about 0.5 ng/ml and were well above the assumed minimum effective value to induce venoconstriction (0.06 ng/ml). Dextran concentrations were significantly higher when DHE was co-administered, possibly, due to changes in plasma volume. It is concluded that DHE 0.5 mg s.c. twice daily will give an adequate plasma concentration and that there was no important interaction between it and infused dextran 70.
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  • 186
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 25 (1983), S. 77-80 
    ISSN: 1432-1041
    Schlagwort(e): meptazinol ; pharmacokinetics ; multiple dosing ; plasma protein binding ; analgesic
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary The pharmacokinetics of meptazinol (Meptid®) have been studied in nine male volunteers after single and multiple oral administration of 200 mg tablets and also after a single 25 mg intravenous dose. Plasma concentrations of meptazinol were determined by HPLC using fluorescence detection. Drug absorption after oral dosage was rapid, peak plasma concentrations being reached between 0.25 and 2 h after drug administration. Subsequent elimination proceeded in an apparently mono-exponential fashion with a half-life of 2 h, although after intravenous dosage there was evidence of an initial rapid distributive phase. The mean total plasma clearance was 2.21/min and the mean apparent volume of distribution (Vdβ) was 4.99 l/min. The bioavailability ranged from 1.9 to 18.5% (mean=8.7%) and was related to the rate of absorption. Multiple dosing, 6-hourly for 3 days, did not produce any accumulation above that predicted from a single dose. Plasma protein binding of the drug was 27.1% and did not vary over the therapeutic concentration range of 25 to 250 ng/ml.
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  • 187
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 25 (1983), S. 95-101 
    ISSN: 1432-1041
    Schlagwort(e): carteolol ; pharmacokinetics ; beta-adrenoreceptor blocking drug ; absolute bioavailability ; plasma levels ; urinary excretion ; renal handling
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary The pharmacokinetics and absolute bioavailability of a new nonselective β-adrenoreceptor blocking agent, carteolol, were investigated after administration of single intravenous and oral doses to eight normal volunteers. Plasma and urine drug concentrations were measured by an HPLC method. The pharmacokinetic parameters after intravenous dosing were obtained by a two-compartment analysis: elimination or β-phase t1/2 4.7±0.3 h; Vc, 0.74±0.101/kg; Vd, 4.05±0.48 l/kg; Cl, 10.13±0.94 ml/min/kg; ClR, 6.56±0.58 ml/min/kg; and ClNR, 3.57±0.40 ml/min/kg. The absolute bioavailability obtained from plasma data was 83.7±8.0%, which was consistent with that derived from analysis of urine of 82.7±4.2%. The amounts excreted unchanged in urine up to 48 h after the intravenous and oral doses were 65.0±1.5% and 53.8±3.2% of the administered doses, respectively. The t1/2 for removal of the drug derived from plasma and urine findings after intravenous and oral dosing were similar, which indicates that the main route of elimination of carteolol is via the kidneys. As the ClR of carteolol exceeded the Cl of creatinine there may be renal tubular secretion of the drug.
    Materialart: Digitale Medien
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  • 188
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 25 (1983), S. 237-241 
    ISSN: 1432-1041
    Schlagwort(e): triamterene ; bioavailability ; pharmacokinetics ; metabolism ; hydroxy triamterene sulphate ; urinary excretion ; i.v. administration ; first-pass-effect
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary With a new formulation, which made intravenous infusion of triamterene (TA) possible, plasma levels and urinary excretion rates of TA and its main metabolite (OH-TA-ester) were measured in a randomized, cross-over trial in 6 healthy volunteers given triamterene 10 mg i.v. and 50 mg p.o. TA and OH-TA-ester were determined by densitometric measurement of native fluorescence after thin layer chromatography. Distribution volumes of the central compartment of TA and OH-TA-ester were 1.49 l/kg and 0.11 l/kg, respectively. Terminal half-lives were 255 min for TA and 188 min for OH-TA-ester after i.v. administration. For TA total plasma clearance was 4.5 l/min and renal plasma clearance 0.22 l/kg. The formation of OH-TA-ester was very rapid and the concentration of the metabolite exceeded that of TA at all times. After i.v. administration the urinary recovery of TA and OH-TA-ester was 4.4% and 50.9%, respectively. The bioavailability of TA was 52%, corresponding to absorption of 83%. TA is partly eliminated by a first-pass-effect. The main metabolite of TA is OH-TA-ester, which is pharmacologically active.
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  • 189
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 25 (1983), S. 369-373 
    ISSN: 1432-1041
    Schlagwort(e): pengitoxin ; pharmacokinetics ; 16-acetylgitoxin ; absorption ; urinary excretion ; healthy subjects ; cardiac glycoside
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary The pharmacokinetics of pengitoxin has been studied in 28 healthy subjects after intravenous and oral administration. The mean plasma concentration 24 h after 0.5 mg i.v. was 5.2 ng · ml−1. Following an open two-compartment model a mean elimination half-life of 60.5 h (24.9 to 103.5 h) and a mean volume of distribution (Vdarea) of 66.91 (31.8 to 109.61) were calculated. Absorption calculated by comparison of the AUC0-∞-values amounted to 99%. Within 4 days, 16.7% (11.7 to 21.1%) or 27.8% (18.4 to 33.7%) (0.5 mg i.v. or 1.2 mg p.o.) was excreted in urine. After pengitoxin 0.5 mg i.v. total body clearance and renal clearance were 13.3 ml · min−1 (7.0 to 18.6 ml · min−1) and 3.0 ml · min−1 (1.9 to 3.9 ml · min−1) respectively. The elimination half-life of pengitoxin is longer than that of digoxin and distinctly shorter than that of digitoxin, whilst its distribution volume and clearance are closer to those of digitoxin than of digoxin.
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  • 190
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 25 (1983), S. 399-405 
    ISSN: 1432-1041
    Schlagwort(e): ceftriaxone ; pharmacokinetics ; concentration-dependent binding ; volume of distribution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary We have theoretically examined the influence of plasma protein binding (specifically the fraction unbound, fp) on the pharmacokinetic parameters following rapid injection of a drug undergoing concentration-dependent binding. Particular emphasis was placed on the apparent volume of distribution terms based on both total and unbound drug concentrations. Computer simulations were performed to establish the validity and utility of such relationships. The following observations were made: a) distributional parameters based on total drug (both Vβ and the model-independent VSS) were inaccurate/invalid; b) V β based on unbound drug was misleading; c) the model-independent VSS for unbound drug accurately predicted the steady state situation. Furthermore, two new terms ( $$\bar f_P $$ and $$\bar V_{SS}^T $$ ) were introduced which provide additional insight concerning the disposition of this type of drug. The $$\bar f_P $$ is the area-weighted average fraction unbound in the plasma and $$\bar V_{SS}^T $$ is the corrected steady state distribution term for total drug levels. The present study indicates that useful distributional and clearance terms can be calculated for this type of drug, provided that the time course of unbound drug as well as total drug can be followed. Moreover, guidelines for their extrapolation to steady state conditions and their correct interpretations are discussed.
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  • 191
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 25 (1983), S. 455-457 
    ISSN: 1432-1041
    Schlagwort(e): digoxin ; concentration plateau ; pharmacokinetics ; systolic time intervals ; optimal infusion scheme ; dose-response data
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary Using a volume-controlled infusion pump, a mean serum plateau level of digoxin of 4–5 ng/ml was rapidly achieved and maintained in 6 healthy volunteers. The infusion scheme was calculated on the basis of data published on the pharmacokinetics and pharmacodynamics of digoxin following bolus intravenous injection. The magnitude of the response (change in electromechanical systole) at the end of the plateau phase was comparable to that observed with the concentration in the therapeutic range at steady state.
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  • 192
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 25 (1983), S. 449-453 
    ISSN: 1432-1041
    Schlagwort(e): canrenone ; pharmacokinetics ; plasma level ; bioavailability ; urinary excretion ; spironolactone
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary Five healthy male volunteers received canrenoate-K 200 mg (Sincomen® pro injectione) by intravenous injection and one week later spironolactone 200 mg (Sincomen®-100) orally. Plasma levels and urinary excretion of unchanged canrenone were determined up to 24 h by a specific HPLC method. Following intravenous administration, the maximum plasma level of 2066±876 ng/ml was found after 29±15 min and thereafter the concentration declined with a half-life of 3.7±1.2 h. Total clearance was 4.2±1.7 ml/min·kg. After oral ingestion, the maximum concentration of 177±33 ng/ml was observed at 4.4±0.9 h. The absolute bioavailability of canrenone was 25±9%. Within 24 h, respectively 0.4 and 0.6 mg, canrenone were excreted by the kidney after intravenous and oral administration. The half-life of elimination was 4.9±1.8 h (i.v.) and 3.9±1.2 h (p.o.).
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  • 193
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 25 (1983), S. 497-501 
    ISSN: 1432-1041
    Schlagwort(e): methadone ; pharmacokinetics ; steady state ; addiction rehabilitation ; therapeutic failure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary Deuterated methadone (M-d3) and GC-MS analysis were used to study the steady state pharmacokinetics of methadone (M) in eight patients reported as therapeutic failures in a methadone maintenance treatment programme. The patients were compared to an unselected group of 12 patients stabilized on M for 25 days. During one dosage interval a pulse dose of M-d3 was administered intravenously instead of the oral M-dose (M-d0). The pharmacokinetic parameters, half-life in the β-phase (t1/2β), volume of distribution during the postdistributive phase (Vdβ) and during steady state (Vdss) were determined as well as the body (ClS) and renal (ClR) clearances of M. Pronounced differences in Vdβ and Vdss were found between the two groups. The therapeutic failures had a smaller Vdβ and Vdss 3.09±0.96 l/kg and 2.74±0.96 l/kg vs 4.56±1.00 l/kg and 4.20±0.78 l/kg in the control group. The differences were due to changes between the groups in the volume of the central compartment. Differences between the groups were also found in t1/2β — 24.5±2.6 h in the therapeutic failures and 34.0±7.0 h (p〈0.001) in the comparison group. However, the change in t1/2β was probably a consequence of the change in Vdβ, as the body clearance of M was similar in the two groups — 104±36 ml/min vs 111±36 ml/min. The smaller volume of distribution could lead to unacceptably high fluctuation of M in the central compartment, and withdrawal symptoms during the latter part of the dosage interval. The appropriate treatment of this subgroup of patients on methadone treatment is not to increase the dose but to shorten the dosage interval. Alternatively, a longer-acting opiate, such as 1-α-acetylmethadol (LAAM), may be used.
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  • 194
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 25 (1983), S. 529-534 
    ISSN: 1432-1041
    Schlagwort(e): penbutolol ; pharmacokinetics ; blood pressure effect ; heart rate effect ; dose response relationship ; tolerance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary The present study was done to establish the dose-response relationships for effects on heart rate and systolic and diastolic blood pressure, tolerance and plasma disappearance kinetics after large intravenous and oral doses of penbutolol. Twelve healthy volunteers were randomly allocated to receive penbutolol (n=8) or placebo (n=4) in this single blind, placebo-controlled investigation. The degree of beta-blockade was measured by standarized exercise tests at work loads selected to produce a heart rate of 150/min without treatment. Penbutolol was given as single i.v. doses of 3, 6 and 12 mg and as 40, 80 and 120 mg once daily for one week, measurements being made 2 and 24 h after the last dose. Penbutolol i.v. did not influence the resting heart rate but it did reduce resting systolic blood pressure in a non-dose dependent manner. Exercise heart rate and systolic pressure were lowered by all the intravenous doses. All oral doses of penbutolol lowered exercise heart rate and systolic blood pressure to the same extent. The reductions in exercise tachycardia was still present after 24 h. After i.v. administration t1/2 was approximately 1.2 h and the volume of distribution was 32–42 l. All doses were well tolerated.
    Materialart: Digitale Medien
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  • 195
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 25 (1983), S. 633-637 
    ISSN: 1432-1041
    Schlagwort(e): delta-9-tetrahydrocannabinol ; mood ratings ; pharmacodynamics ; pharmacokinetics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary This study explored the relationships in man between various pharmacological effect of Δ9-tetrahydrocannabinol (THC), plasma THC concentration, and pharmacokinetic parameters of THC. Three male and three female experienced marihuana users smoked two standard marihuana cigarettes. The relationships between heart rate, subjective “high” rating, Linear Mood Scale factors, and plasma THC concentration were assessed. Significant correlations were observed between various Linear Mood Scale factors and pharmacokinetic parameters reflecting the magnitude of drug intake and the degree of temporal dissociation between the time courses of plasma THC concentration and pharmacological effects (tachycardiac effect, “high”). In particular, the disturbed/weird and sensitive/aware mood factors correlated positively with pharmacokinetic measures of drug intake and time lag to effect. A more reliable index of intoxication with THC may be provided by the global subjective “high” rating, rather than other ratings more specific for particular moods.
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  • 196
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 25 (1983), S. 117-121 
    ISSN: 1432-1041
    Schlagwort(e): serum digoxin ; pregnancy ; digoxin-renal-clearance ; creatinine-clearance ; digoxin-elimination ; pharmacokinetics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary Digoxin-renal-clearance, creatinine-clearance, 24-h urine elimination of digoxin and serum digoxin were studied in 15 patients in the third trimester of pregnancy and 6 to 12 weeks post-partum. There was significant fall post-partum in the first three. There was also a significant fall post-partum in serum digoxin levels. This finding was unexpected, but may be due to heightened absorption exceeding increased elimination because of the physiological status in pregnancy.
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  • 197
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 24 (1983), S. 89-92 
    ISSN: 1432-1041
    Schlagwort(e): theophylline ; kwashiorkor ; marasmus ; children ; nutritional status ; pharmacokinetics ; dosage recommendation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary The pharmacokinetics of theophylline in Ethiopian children of differing nutritional status was studied. In 8 children of normal weight, the t1/2β (4.93 h) plasma clearance (1.22 ml/min/kg and Vd area (504 ml/kg) were similar to those of Swedish children of normal weight. In children with marasmus or kwashiorkor there was an increased volume of distribution. The increase in Vd was reflected in an increased biological half-life, in spite of a slight but not significant increase in clearance in both of these groups of children. The pharmacokinetic changes in clearance and volume of distribution found in malnutrition should counteract each other, so from a clinical point of view theophylline can be given to Ethiopian children according to the standard dosage recommendation, regardless of nutritional status.
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  • 198
    ISSN: 1432-1041
    Schlagwort(e): theophylline ; smoking habit ; absolute bioavailability ; pharmacokinetics ; sustained release preparation ; plain tablet preparation ; antipyrine pharmacokinetics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary The bioavailability and pharmacokinetics of theophylline from a plain uncoated and 2 newly designed, sustained-release tablet formulations, as compared to intravenous aminophylline, were studied in 12 healthy adult male volunteers. The subjects were divided into two groups (n=6) with respect to smoking habit and on 4 separate occasions each received, on a randomized cross-over basis, a single dose of 400 mg equivalent of theophylline from every dosage form. The intravenous aminophylline study showed that habitual smoking had a significant (p〈0.05) effect on plasma theophylline clearance (0.051±0.006 vs 0.035±0.004 l/kg/h). Smoking significantly reduced the raw AUC from the 4 dosage forms (p〈0.05), but did not change the characteristics of absorption of each formulation. There was a non-significant trend towards reduced absolute bioavailability of theophylline from sustained-release formulations in smokers (percentage mean difference — 16% for one formulation and 13% for another). The trend was not observed for the plain uncoated tablet, which was rapidly absorbed (p〈0.01 to 0.05 in Ka, tmax and Cmax compared to sustained-release tablets). Similarity of the in vitro dissolution profiles of the two sustained-release formulations did not imply similarity of the in vivo absorption characteristics. Plasma clearances of theophylline and antipyrine were significantly correlated (p〈0.05,r=0.693,n=10). Thus, smoking enhanced the elimination of theophylline regardless of the dosage form administered. However, the extent to which habitual smoking may affect the hepatic first-pass effect on theophylline from sustained-release formulations requires further study. The results also suggest that theophylline and antipyrine may share a similar or common and presumably polycyclic hydrocarbon-inducible form(s) of microsomal drugmetabolizing enzyme.
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  • 199
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 24 (1983), S. 103-108 
    ISSN: 1432-1041
    Schlagwort(e): dexamethasone ; bioavailability ; pharmacokinetics ; ‘first-pass’ effect ; pre-systemic elimination
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary The pharmacokinetics and oral biovailability of dexamethasone were studied in 6 patients with neurological disease being treated with high dosages of the drug. A specific high performance liquid chromatographic assay was used to measure dexamethasone concentrations. Unlike the previously published mean figure of 0.78 for the oral bioavailability of the drug given in single doses to healthy volunteers, the mean bioavailability of dexamethasone in the patients studied was 0.53±SD 0.40. It appeared more likely that this incomplete bioavailability was due to presystemic elimination than to poor absorption. The intravenous clearance of the drug was relatively high (0.4902±SD 2291 l kg−1, approximately 65% of expected hepatic plasma flow), the oral clearance higher (2.5804±SD 3.2181 l kg−1 h−1) while the absorption rate constant (4.8729±8.4998 h−1), suggested rapid absorption after oral administration. Prior phenytoin and possibly prior dexamethasone therapy is likely to have contributed to the higher clearance values of the drug in these patients than the values reported in healthy volunteers after single dose studies.
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  • 200
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 24 (1983), S. 109-112 
    ISSN: 1432-1041
    Schlagwort(e): cefroxadine ; haemodialysis ; pharmacokinetics ; terminal renal impairment
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary The pharmacokinetics of cefroxadine was studied in 17 patients with terminal renal impairment, 10 of whom were undergoing 5 h dialysis sessions. The antibiotic was administered as a single oral dose of 500 mg. Cefroxadine followed a single compartment open kinetic model. During the interdialysis period in patients with terminal renal impairment, an average Cmax of 26.59 µg/ml and a tmax of 3.65 h were reached, which are greater than in patients with normal renal function. The serum half-life was reduced from 23.55 h in the interdialysis periods to 3.40 h during the dialysis sessions. The average extraction coefficient was 0.249. It is recommended that a 500 mg dose cefroxadine should be administered at the end of each dialysis session if the interdialysis period is 48 h.
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