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  • 1980-1984  (7,065)
  • 1965-1969  (2,202)
  • 1920-1924
  • Analytical Chemistry and Spectroscopy  (4,636)
  • Physics  (4,506)
  • Insulin
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Year
  • 1
    ISSN: 1432-1440
    Keywords: Aldosterone ; Glucose ; Insulin ; Potassium ; Renin-angiotensin system ; Cortisol ; Captopril
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Glucose loading is known to cause acute suppression of plasma aldosterone and stimulation of plasma renin activity. The relative contribution of variations in circulating angiotensin II to the regulation of aldosterone secretion following glucose loading was assessed in ten normal subjects. The effects of a standard oral glucose loading test (100 g) on plasma concentrations of glucose, insulin, potassium, aldosterone, renin activity and cortisol were studied (a) under basal conditions, and (b) after inhibition of angiotensin II with the converting enzyme inhibitor captopril (50 mg t.i.d. during 3 days). Under basal conditions the acute increase in plasma glucose and insulin after glucose loading was accompanied by a significant decrease (P〈0.01) in plasma cortisol and aldosterone and by a significant increase in plasma renin activity (P〈0.01); plasma potassium was decreased slightly but not significantly. Following captopril treatment preloading plasma renin activity was increased significantly, most probably reflecting an effective reduction of angiotensin II. Glucose loading caused a similar suppression of plasma aldosterone, as observed under basal conditions. This observation suggests that renin activation does not substantially contribute to the acute regulation of plasma aldosterone after an oral glucose load.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 62 (1984), S. 523-530 
    ISSN: 1432-1440
    Keywords: Neurotensin ; Gastrointestinal hormones ; Gastric secretion ; Pancreatic secretion ; Motility ; Insulin ; Glucagon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Neurotensin is a tridecapeptide originally isolated and characterized from bovine hypothalamus and later, in identical form, from bovine and human intestine. In the rat about 85% of immunoreactive neurotensin is found in the gut and about 10% in the brain. When an antibody specific for the amino terminal region of neurotensin was used the highest concentrations were found in the mucosa of the ileum, while an antibody specific for the biologically active region, the carboxyl terminus, also detected large amounts in the mucosa of the upper gastrointestinal tract. After a meal neurotensin — as measured by carboxyl terminal antibodies — rises after 5 min, a time in which the chymus has not yet reached the ileum, the main source of whole neurotensin. It is therefore possible that the carboxyl terminal molecules of neurotensin, found in the upper gastrointestinal tract, play an important physiological role. In plasma, neurotensin is rapidly degraded into smaller amino terminal and therefore biologically inactive molecules. Increases of carboxyl terminal neurotensin have been found in plasma in only a very few studies. The nature of this immunoreactive material has not yet been established. Therefore, the physiological role of neurotensin as a circulating hormone is unknown. Potential actions of neurotensin include thermoregulation, regulation of hormone release from brain (pituitary hormones) and gut (glucagon, insulin, somatostatin, pancreatic polypeptide), increase of vascular permeability, vasodilatation, inhibition of gastric acid secretion, stimulation of pancreatic secretion and changes of gut motility from the fasting to the fed type.
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  • 3
    ISSN: 1433-8580
    Keywords: Oscillations ; Insulin ; Glucose
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The present study was designed to determine the effect of low dose continuous and oscillatory intraportal insulin infusions upon subsequent glucose-induced insulin release. In overnight-fasted and anesthetized rats with indwelling catheters in the jugular vein, carotic artery, and mesenteric vein insulin was infused intraportally for 3 h via the mesenteric vein catheter at a continuous rate of 45 µU/kg·min, or the same amount of insulin was administered at alternating high (72 µU/kg·min) and low infusion rates (18 µU/kg·min), respectively, in 2-, 4-, 8-, and 16-min cycles (oscillatory infusions). Another group received a continuous infusion of saline. Glucose (0.4 g/kg) was given i.v. 30 min after the end of the insulin or saline infusion. During the 3-h infusion of insulin or saline the peripheral glucose level remained unchanged in all groups. In response to the i.v. glucose load peripheral arterial plasma insulin levels were significantly elevated after preceding oscillatory infusions compared to the continuous insulin infusion. As compared to the group receiving saline the glucose-induced insulin response after continuous insulin infusion was significantly reduced. The plasma glucose responses were not different except for inexplicably elevated glucose levels in the 4-min cycle group. No difference was observed for plasma glucagon levels in all groups. The present data demonstrate an augmented responsiveness of theβ-cell to glucose after a preceding oscillatory infusion of insulin and an impaired responsiveness to glucose after continuous insulin infusion. This indicates that an oscillatory insulin release might be of importance for an adequate regulation ofβ-cell function.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Diabetologia 27 (1984), S. 373-378 
    ISSN: 1432-0428
    Keywords: Insulin ; administration and dosage ; therapeutic use ; insulin infusion devices
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The tendency of insulin to form insoluble aggregates is a major obstacle to the development of implantable insulin infusion systems for treatment of insulin-deficient diabetic patients. A test system was developed to examine the kinetics of insulin aggregation under controlled conditions of temperature, vibration and contact material in an effort to provide design criteria for minimising aggregation. The contact materials tested were all potentially suitable for pump reservoirs on engineering criteria and included metals (stainless steel, titanium and a titanium alloy) and various plastics (polypropylene, polytetrafluoroethylene, Polyvinylchloride, polyamide, cellulose butyrate and silicone elastomer). The rate of insulin aggregation was markedly affected by the nature of the contact material. Hydrophilic materials, particularly polyamide and cellulose butyrate (2% of total insulin aggregated after 96 h vibration), appeared more compatible with insulin stability than did hydrophobic ones, such as polypropylene (16% aggregation) and Polyvinylchloride (37% aggregation). A specially formulated ‘pump’ insulin preparation, stabilised by addition of polyethylenepolypropyleneglycol, was significantly superior (three to five times more stable) to a regular neutral insulin formulation under most, but not all, conditions. Standard clinical syringes (polypropylene) performed poorly with both insulin formulations but especially with the neutral regular insulin (100% aggregation after 96 h vibration). In addition to physical aggregates, significant amounts (5%–30%) of the insulin remaining in solution were no longer detectable by immuno- or receptorassay in all materials tested. Appropriate combinations of insulin formulations and materials can minimise insulin aggregation and denaturation, but since the mechanisms involved are as yet poorly understood, realistic testing of proposed reservoir components and insulin formulations must be a prerequisite in insulin infusion pump planning and design. These testing procedures should be designed to test for denaturation in solution as well as for precipitation of insulin.
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  • 5
    ISSN: 1432-0428
    Keywords: Insulin ; insulin antibody ; immunogenicity ; immune response genes ; haemocyanin ; HLA ; DR7 ; C2 ; C4 ; factor B ; Gm ; C-peptide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Seventy-nine patients were observed prospectively during their initial period of treatment with conventional bovine insulins. Insulin antibody levels 6 months after starting insulin therapy did not correlate with age, gender or β cell function at onset of treatment. Patients who required soluble insulin in addition to isophane insulin developed higher levels of insulin antibody. Patients bearing the HLA-B8, DR3 and C4AQO alleles had lower levels of insulin antibody, whereas those bearing DR7 produced significantly higher levels. Other alleles at the C4A, C4B, C2, factor B or Gm loci did not appear to have a significant effect on insulin antibody production. The hyporesponsiveness of B8/DR3/C4AQO-positive individuals probably reflects a non-specific abnormality of immunity whereas the enhanced responsiveness of those positive for DR7 suggests the presence of a specific immune response gene for insulin
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-0428
    Keywords: Insulin ; gastric inhibitory polypeptide ; insulin sensitivity ; glucose tolerance ; diabetes ; diet ; fat ; rate of carbohydrate digestion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The present study examined the acute effects of coingestion of fat (37.5 g) on the post-prandial metabolic responses to 75 g of carbohydrate which was either slowly absorbed (lentils) or rapidly absorbed (potatoes). Co-ingestion of fat resulted in a significant flattening of the post-prandial glucose curves, the effect being more pronounced for the rapidly absorbed potatoes. This was probably due to delayed gastric emptying. However, the post-prandial insulin responses to either carbohydrate were not significantly reduced by fat, suggesting that the insulin response to a given glucose concentration was potentiated in the presence of fat. The gastric inhibitory polypeptide (GIP) responses to both carbohydrates were greatly increased in the presence of fat. To investigate further the possible roles of GIP in the entero-insular axis, a 5-g bolus of glucose was injected intravenously 1 h after lentils ± fat. This was sufficient to raise the glucose levels above the threshold reported for GIP to potentiate insulin secretion. However, despite the large differences in circulating GIP levels, the insulin response to glucose was not affected by the presence of fat. These results suggest that (1) the rate of absorption of carbohydrate is a major determinant of post-prandial metabolic responses even in the presence of fat, (2) fat-stimulated GIP secretion does not potentiate glucose-induced insulin secretion, and (3) the potentiation of the insulin response to glucose when carbohydrate is co-ingested with fat is consistent with the well-documented insulin resistance associated with high fat diets.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0428
    Keywords: Insulin ; 3-hydroxy-3-methylglutaryl coenzyme A ; sterol synthesis ; human mononuclear leucocytes ; post-transcriptional regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Incubation of freshly isolated human mononuclear leucocytes in lipid-depleted serum for 4 h resulted in a two-fold increase in 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase activity. Insulin, when added to the incubation medium at concentrations of 10 and 100 nmol/l at zero time, caused additional increases in the enzyme activity of 30% and 37%, respectively. The hormone action was not immediate because no effect was observed when insulin was added at 4 h and activity examined thereafter. Under these conditions sterol synthesis from 14C-acetate and tritiated water was strictly proportional to the activity of HMG-CoA reductase. Cycloheximide (20 μg/ml), a translational inhibitor of protein synthesis, prevented the insulin-mediated increase in the enzyme activity and the incorporation of 14C-acetate into sterols. Cordycepin (50 μg/ml) inhibited messenger RNA synthesis by 〉 50%, but had no inhibitory effect on the induction of HMG-CoA reductase and sterol synthesis. Low density lipoprotein (80 μg protein/ml) and complete serum blocked the induction of the enzyme and sterol synthesis from 14C-acetate caused by lipid-depleted serum. The insulin-effect, however, remained unchanged. The results suggest that insulin may regulate the de novo synthesis of HMG-CoA reductase and accordingly sterol synthesis at a post-transcriptional level.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Intensive care medicine 10 (1984), S. 209-211 
    ISSN: 1432-1238
    Keywords: Amitriptyline ; Hydrocortisone ; Insulin ; Prenalterol ; Cardiac failure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A case of severe amitriptyline poisoning with grade IV coma, seizures, bradycardia and hypotension who did not respond to dopamine was successfully treated with prenalterol, a new cardioselective β-agonist. The case is discussed with respect to plasma concentrations of dopamine, prenalterol and amitriptyline. Prenalterol, hydrocortisone and insulin may be useful as inotropic agents in tricyclic poisoning where dopamine fails to provide an adequate response.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 400 (1984), S. 413-417 
    ISSN: 1432-2013
    Keywords: Sodium pump ; Na-K ATPase ; Na fluxes ; Vanadate ; Insulin ; Skeletal muscle ; Ouabain
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We have measured the effects of concentrations of vanadate ranging between 0.01 and 10 mM on the22Na efflux of frog sartorius muscles. The addition of vanadate had no effects when concentrations lower than 0.5 mM were used; higher concentrations increased Na efflux. The increase was abolished by the addition of ouabain (10−5M). In muscles pretreated with ouabain vanadate did not modify Na efflux. The stimulatory effects of vanadate on Na efflux were also observed in Na-free solutions indicating that the effux of vanadate was not caused mainly either by an increase in the exchange of Na for Na or by an increase in Na entry into the muscle. We also examined the effects of vanadate on muscles immersed in solutions containing 20 mM K+; both vanadate and increased K+ produced stimulations of Na efflux that were additive. Similarly when the effects of vanadate and insulin were measured on the Na efflux of the same muscle, additive effects were found. As the ouabain-sensitive Na efflux in frog muscle is generally agreed to be due to the activity of the Na-K ATPase, our findings suggest that the net effect of vanadate in intact muscle cells is an increase in the activity of the Na pump. Since vanadate affects many enzymes it is quite possible that the stimulatory action is not due to a direct effect on the Na-K ATPase but may be mediated through an intermediary step. Regardless of the specific mechanism, it is evident that, our results as well as other findings in the literature, strongly indicate that Na pumping by intact cells can be increased by vanadate administration. Hence it is not justified to attribute the physiological modifications caused by vanadate administration to blockade of the Na-K ATPase unless the attribution is justified by specific experimental evidence.
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  • 10
    ISSN: 1432-2013
    Keywords: Biological transport ; Insulin ; Energy metabolism ; Epinephrine ; Endocrinology ; Albuterol (salbutamol) ; Active sodium-potassium transport ; Muscle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The total metabolic energy expenditure associated with active Na−K-transport over the first 20 min of stimulation with insulin, adrenaline or salbutamol (ΔHmNa−K) was determined from direct calorimetric and tracer ion flux measurements in isolated muscles at rest. The reversible work performed by the Na−K-pump during the same interval of time (WrevNa−K) was calculated as the product of the ouabain-suppressible Na−K transfers and the mean free energy increase imparted to the two ions as they are transported against their electrochemical gradients across the plasma membrane. Comparison of membrane potential and intracellular Na and K concentrations before and after the stimulations indicated that part of WrevNa−K had contributed to increase the ion electrochemical gradients in the preparation (i.e. had not been lost as heat) during the 20 min period. Accordingly, the maximum value of ΔHmNa−K was taken as the sum of the ouabain-suppressible heat production and WrevNa−K. Following stimulation with insulin, adrenaline or salbutamol this maximum corresponded to 10, 10 and 12% respectively, of basal metabolism. Under the same three conditions, the minimum “energetic efficiency” of the active Na−K-transport process, defined as the ratio between WrevNa−K and maximum ΔHmNa−K, was 35, 41 and 38%, respectively.
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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 142 (1984), S. 179-185 
    ISSN: 1432-1076
    Keywords: Craniopharyngioma ; Growth ; Insulin ; Neurosurgery ; Radiotherapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Management of craniopharyngiomas is still controversial. 28 children with this tumor were studied. GH deficiency was present in 22 patients following surgery, 10 of these GH-lacking patients had normal or accelerated growth (usually associated with rapid weight gain) postoperatively. Somatomedin levels were normal in three of six normally growing patients. After craniotomy their basal and TRH-stimulated prolactin levels were in the normal range, but their insulin secretion was markedly increased. Postoperatively there was a significant correlation between peak insulin levels following arginine infusion and growth velocity in all patients. Complete tumor removal could be performed in 28% of our patients. Altogether 36% of all patients had at least one tumor recurrence. Recent literature with the addition of our series showed tumor recurrence in 22% of patients with “total” tumor excision and in 72% of patients with partial tumor removal. Radiotherapy seems to be capable of destroying craniopharyngioma tissue. The recurrence rate was only 26% in patients with subtotal excision plus radiotherapy. Unless radical tumor removal can be attempted with safety, subtotal tumor removal plus radiotherapy appears to be the treatment of choice for craniopharyngioma.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 237 (1984), S. 169-179 
    ISSN: 1432-0878
    Keywords: Foetal pancreas ; β Cells ; Insulin ; Fasting mothers ; Morphometry ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary After maternal fasting for 72 h the pancreatic β cells of 18-day-old foetal rats show a conspicuous enrichment in secretory material, with an increase of pancreatic insulin concentration and a marked development of the rough endoplasmic reticulum and the Golgi apparatus. The morphometric analysis shows that the intracytoplasmic migration of the secretory granules is inhibited, principally inside the cell web. Consequently the number of secretory granules fused with plasma membrane decreases and this is associated with a decreased foetal plasma insulin. The difference in the ultrastructural aspect of the β cells of foetuses from fasting mothers and of foetuses from fed mothers is less conspicuous at 19 days of gestation and progressively disappears at 20 and 21 days. The modifications in ultrastructural aspect and in functional state are discussed.
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 53 (1984), S. 57-62 
    ISSN: 1439-6327
    Keywords: Muscle glycogen ; Time sequence ; Free fatty acids ; Insulin ; Exercise in humans
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To evaluate the metabolic and hormonal adaptations following a rapid change in muscle glycogen availability, 14 subjects had their muscle glycogen content increased in one leg (IG) and decreased in the other (DG). In group A (n=7), subjects exercised on a bicycle ergometer at 70% maximal oxygen uptake for 20 min using the DG leg. Without resting these same subjects exercised another 20 min using the IG leg. Subjects in group B (n=7) followed the same single-leg exercise protocol but in the reverse order. In order to get some information on the time sequence of these possible adaptations, blood samples were collected at rest and at the beginning and the end of each exercise period (min 5, 20, 25, and 40). Results indicated that 5 min after the switch from the DG leg to the IG leg. transient increases in plasma free fatty acids (1.20 to 1.39 meq·l−1) and serum insulin (10.1 to 12 mU·l−1) concentrations occured. Between minute 25 and 40 of exercise, the DG to IG switch was accompanied by a decrease in free fatty acids and glycerol concentrations as well as an increase in lactate levels. An opposite response was observed in the IG to DG condition during the same time span. Plasma norepinephrine, epinephrine, glucagon, and serum cortisol concentrations were not significantly affected by the leg change. These results suggest a rapid preferential use of muscle glycogen when available and a time lag in the response of the extramuscular substrate mobilization factors.
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 53 (1984), S. 267-273 
    ISSN: 1439-6327
    Keywords: Exercise ; Triglycerides ; Free fatty acids ; Glycerol ; Insulin ; Catecholamines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Metabolic and hormonal responses to prolonged treadmill exercise in dogs fed a fat-enriched meal 4 h prior to the exercise were compared to those measured 4 h after a mixed meal or in the postabsorptive state. Ingestion of the fat-enriched meal caused significant elevations in the resting values of plasma triglyceride (TG), free fatty acid (FFA), and glycerol concentrations. A reduction of the plasma TG concentration (from 1.6±0.2 to 1.1±0.10 mmol·l−1,P〈0.005) occurred only in dogs exercising after the fat-enriched meal. No significant changes in this variable were noted in dogs fed a mixed meal, whilst in the postabsorptive state exercise caused an increase in the plasma TG level (from 0.42±0.03 to 0.99±0.11 mmol·l−1,P〈0.01). The exercise-induced elevations in plasma FFA and glycerol concentrations were the highest in the dogs given the fat-enriched meal. Plasma glycerol during exercise correlated with the initial values of circulating TG (r=0.73). The plasma FFA-glycerol ratio, at the end of exercise was lowest in the dogs taking the fat-enriched meal (1.39±0.19), suggesting an increased utilization of FFA in comparison with that in the postabsorptive state (3.27±0.37) or after a mixed meal (2.88±0.55). Basal serum insulin (IRI) concentrations were similarly enhanced in dogs fed fat-enriched and mixed meals, and they were reduced to control values within 60 min of exercise. Plasma adrenaline and noradrenaline concentrations correlated with time of exercise (r=0.84 andr=0.96, respectively) and were unaffected by the nutritional modifications. It is concluded that ingestion of a single fat-enriched meal considerably modifies the exercise-induced changes in lipid metabolism. The pattern of changes in plasma TG, FFA, and glycerol concentrations indicates an enhanced hydrolysis of plasma chylomicron-TG, suggesting that this lipid source may contribute markedly to exercise metabolism.
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  • 15
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 52 (1984), S. 426-430 
    ISSN: 1439-6327
    Keywords: Apoproteins ; Lipoproteins ; Insulin ; Blood lactate ; Physical training
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Eight well-trained males were studied before, during and after 6 months of a progressively increased amount of endurance training in order to elucidate the effects on the apoproteins and apo-lipoproteins. Initially high HDL-cholesterol levels were revealed (1.62±0.15 mmol×l−1, mean ± SE.). After a transient but not significant, slight decline at the onset of the increased training program (1.57±0.06 mmol×l−1) HDL-cholesterol increased gradually to the end of the training period (1.92±0.12 mmol×l−1). There was an increased aerobic capacity as judged by maximal oxygen uptake and by lactate concentration during standardized submaximal work. However, at the end of the training period, a levelling off in maximal oxygen uptake was revealed, while HDL-cholesterol was still increasing. The present data demonstrate that HDL can be influenced by training at all levels of aerobic capacity.
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  • 16
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 140-141 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary columns ; Narcotics: street samples ; Narcotics, adulterants and diluents: simultaneous determination ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 17
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 147-148 
    ISSN: 0935-6304
    Keywords: Liquid chromatography ; HPLC ; Racemate separation ; β-Cyclodextrin stationary phase ; Cyclohexylphenylglycolic acid ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 18
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 154-155 
    ISSN: 0935-6304
    Keywords: Capillary gas chromatography ; Effluent splitter ; Dual detection ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 19
    Electronic Resource
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 165-166 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 20
    Electronic Resource
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 160-161 
    ISSN: 0935-6304
    Keywords: Liquid chromatography HPLC ; Bonded phases ; 3,5-Dinitrobenzamidopropyl silica gel ; Charge transfer interaction ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
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  • 21
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 161-164 
    ISSN: 0935-6304
    Keywords: High-performance-thin layer chromatography, HPTLC ; Zirconium oxychloride ; Backside fluorodensitometric detection on TLC plate ; Content uniformity test for lanatoside C tablets ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 22
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 172-184 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 11 Ill.
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  • 23
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 203-207 
    ISSN: 0935-6304
    Keywords: Liquid adsorption chromatography, LSC, HPLC ; Multilayer effects in LSC ; HPLC with mixed mobile phase ; HPLC theory ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This paper describes the theory of liquid adsorption chromatography (LSC) with mixed mobile phase, involving formation of multilayer surface phases. An equation describing the dependence of the capacity ratio upon the mobile phase composition is derived and theoretical curves illustrating the same dependence are calculated accordingly by assuming different thicknesses of the surface phase.
    Additional Material: 3 Ill.
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  • 24
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 211-212 
    ISSN: 0935-6304
    Keywords: Thin layer chromatography, TLC ; Alkylchlorosilanes ; Phosphatidylcholines ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 25
    Electronic Resource
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984) 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 26
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 265-267 
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; C18-silica ; UV-detection ; Tetrodotoxin ; Oxidized derivative ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 27
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 268-270 
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Citrus fruit ; Fungicide residues ; Prochioraz ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 28
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 274-276 
    ISSN: 0935-6304
    Keywords: 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
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 29
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 280-281 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Reaction GC ; Iodination reactor ; Electron capture detection ; Trace analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 30
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    Journal of High Resolution Chromatography 7 (1984), S. 289-291 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 31
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    Journal of High Resolution Chromatography 7 (1984), S. 375-381 
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Reverse phase columns ; Window diagrams ; Aromatic carboxylic acids ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The optimization of the separation of eight aromatic carboxylic acids, using Hypersil SAS and MOS reverse phase columns, with respect to eluent (methanol : water) composition, pH, and temperature, is described. Window diagram techniques are used and the pH of the aqueous buffer and elution temperature are shown to be more critical than eluent composition.
    Additional Material: 11 Ill.
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  • 32
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    Journal of High Resolution Chromatography 7 (1984), S. 398-403 
    ISSN: 0935-6304
    Keywords: Capillary gas chromatography ; Enantiomeric separation ; Racemization ; Halocarboxylic acids ; Amide derivatives ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The direct determination of the enantiomeric purity of halocarboxylic acids is described. The method used involves gas chromatographic separation of the corresponding tert-butylamides on deactivated glass or fused-silica capillaries coated with Chirasil-Val. Both the influence of the amide moiety on enantiomeric resolution and tailing, and the racemization during formation of the amide derivatives were studied.
    Additional Material: 2 Ill.
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  • 33
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    Journal of High Resolution Chromatography 7 (1984), S. 477-479 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Glass capillary column ; Adsorbent ; Cold trapping ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 34
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Packed and capillary columns ; Fungicides and insecticides ; Adsorption ; Length of column ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
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  • 35
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 490-491 
    ISSN: 0935-6304
    Keywords: Column liquid chromatography, HPLC ; Peak compression technique ; Precolumn derivatization ; Thiamine compounds ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 36
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    Journal of High Resolution Chromatography 7 (1984), S. 499-500 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 37
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    Journal of High Resolution Chromatography 7 (1984) 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 38
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 509-514 
    ISSN: 0935-6304
    Keywords: Gas chromatography, GC ; OV-1/FFAP mixed phase, high-temperature ; silylated glass capillary ; Polar phase-coated HTS capillary ; Golay curves of mixed phases ; Thermal and long-term stability of OV-1/FFAP ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: As an alternative to acid pretreated UCON and FFAP capillaries for the analysis of wide-boiling free fatty acid mixtures, OV-1 : FFAP phase mixtures were used on high-temperature silylated inert glass capillary columns. The HETP-carrier gas velocity curves, peak asymmetry factors, coating efficiency, gas phase and stationary phase contributions to the mass transfer resistance were determined for various OV-1 : FFAP ratios. Mixed-phase capillaries showed optimum performance at a 2 : 1 OV-1 : FFAP ratio. The thermal and long-term stability of OV-1-stabilized FFAP columns surpassed those of the UCON and pure FFAP reference column used.
    Additional Material: 3 Ill.
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  • 39
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    Journal of High Resolution Chromatography 7 (1984), S. 531-532 
    ISSN: 0935-6304
    Keywords: Gas chromatography, GC ; Capillary columns ; Retention gaps ; Large sample volumes ; Flooded zone ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 40
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    Journal of High Resolution Chromatography 7 (1984), S. 529-531 
    ISSN: 0935-6304
    Keywords: Capillary electrophoresis ; High resolution separation ; High speed analysis ; Dansyl amino acids ; Fluorescamine labeled peptides ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
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  • 41
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    Journal of High Resolution Chromatography 7 (1984), S. 536-537 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary column ; On-Column injection ; Vaporizing injection ; Decomposition ; α-Ferrocenyl carbinols ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
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  • 42
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    Journal of High Resolution Chromatography 7 (1984), S. 504-508 
    ISSN: 0935-6304
    Keywords: 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
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
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  • 43
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Reversed phase mode ; Prediction of retention time ; Prediction of pKa ; Hydrophobic fragmental constant ; Aromatic acids ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: For optimization of liquid chromatography separations, several approaches have been reported, among them the use of the hydrophobic fragmental constant, as proposed by Rekker [1]. The fragmental constant is derived from the partition coefficients of various solutes between octanol and water and represents a summation of solubility parameters: van der Waals volume, π - π interactions, hydrogen bonding, etc. With these constants the optimization of reversed phase mode liquid chromatography using octadecyl bonded silica gels as packing was feasible, although large error was found for the eluent with a high concentration of organic modifier or water. This is probably due to the heterogeneous solvation of the surface of the packings and to various solvent effects. In addition, when the acid dissociation constant was known, the retention times of aromatic acids in the ionic form were also predicted using the hydrophobic fragmental constant and the dissociation constant. By comparison of the previous data and a method proposed by Perrin et al. [2] it was possible to predict the dissociation constant of aromatic acids and optimize separation in reversed phase mode liquid chromatography using octadecyl bonded silica gels as packing. Furthermore, an equation for calculating the capacity ratios in a given pH eluent was proposed and the predicted and observed capacity ratios of aromatic acids in several eluents were examined in order to improve the above system.
    Additional Material: 4 Tab.
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  • 44
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    Journal of High Resolution Chromatography 7 (1984), S. 542-544 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Fused silica (capillary) columns ; Bonded (cross-linked) phases ; Hydrocarbon analysis ; Olefinic hydrocarbons ; Retention index data ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
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  • 45
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    Journal of High Resolution Chromatography 7 (1984), S. 563-565 
    ISSN: 0935-6304
    Keywords: Gas chromatography, GC ; Fused silica capillary columns ; Amino acid pyrolysates ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In this study, application of a fused silica capillary column for analysis of major mutagenic heterocyclic compounds found in cooked foods was investigated.
    Additional Material: 2 Ill.
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  • 46
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    Journal of High Resolution Chromatography 7 (1984), S. 577-577 
    ISSN: 0935-6304
    Keywords: Multidimensional gas chromatography, MGC ; Deans System ; Temperature programming ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 47
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    Journal of High Resolution Chromatography 7 (1984), S. 584-586 
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Normal and reversed phases ; Steroid esters ; Long-acting contraceptive ; Injectable contraceptives ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
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  • 48
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    Journal of High Resolution Chromatography 7 (1984), S. 593-595 
    ISSN: 0935-6304
    Keywords: High performance thin layer chromatography, HPTLC ; Fluorescence ; Prostaglandins ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 49
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    Journal of High Resolution Chromatography 7 (1984), S. 601-604 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 50
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    Journal of High Resolution Chromatography 7 (1984), S. 142-143 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Solute focussing ; Solvent effect ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 51
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    Journal of High Resolution Chromatography 7 (1984), S. 153-154 
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Silanized silica for HPLC ; Surface silanol groups ; Dimethylzinc tetrahydrofuranate ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 52
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    Journal of High Resolution Chromatography 7 (1984), S. 156-157 
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; HPLC profiling ; Prostaglandins ; High speed HPLC ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 53
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    Journal of High Resolution Chromatography 7 (1984), S. 158-159 
    ISSN: 0935-6304
    Keywords: Multi-mode liquid chromatography ; Adsorption chromatography ; Size exclusion chromatography ; Phenyl-bonded phase ; Styrene oligomers ; Polystyrene polymers ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 54
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    Journal of High Resolution Chromatography 7 (1984), S. 312-318 
    ISSN: 0935-6304
    Keywords: Supercritical fluid chromatography ; Capillary column ; Column diameter ; Efficiency ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Fused silica capillary columns with internal diameters from 100 to 25 μm were coated with SE-54 and evaluated under supercritical fluid chromatographic conditions using carbon dioxide as mobile phase. Experimental results compared well with theoretical predictions. At ten times the optimum mobile phase velocity and for a capacity factor, k of 3, efficiencies of 2300 to 5600 plates m-1 were obtained for column diameters of 100 to 25 μm, respectively.
    Additional Material: 6 Ill.
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  • 55
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    Journal of High Resolution Chromatography 7 (1984), S. 327-327 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 56
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    Journal of High Resolution Chromatography 7 (1984), S. 329-332 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Fused silica capillary columns ; Deactivation ; Polymethylhydrosiloxanes ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 57
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    Journal of High Resolution Chromatography 7 (1984), S. 338-339 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Pesticides ; Multidetection ; ECD-NPSD-SSD ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
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  • 58
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    Journal of High Resolution Chromatography 7 (1984), S. 345-350 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 59
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    Journal of High Resolution Chromatography 7 (1984), S. 355-355 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 60
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary columns ; Thick liquid phase films ; Natural and refinery gases ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
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  • 61
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    Journal of High Resolution Chromatography 7 (1984), S. 382-388 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary columns ; HETP equation ; Optimum column parameters ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
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  • 62
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    Journal of High Resolution Chromatography 7 (1984), S. 431-432 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary columns ; Triglycerides ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 63
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    Journal of High Resolution Chromatography 7 (1984), S. 423-428 
    ISSN: 0935-6304
    Keywords: Capillary column ; Supercritical fluid chromatography ; Stationary phase film thickness ; Efficiency ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Fused-silica capillary columns with internal diameters of 50 μm were coated with 0.25 to 1.0 μm films of SE-54 and evaluated under supercritical fluid chromatographic conditions using carbon dioxide as mobile phase. Experimental results compared well with theoretical predictions. There was no significant difference in hmin or ūopt for film thicknesses from 0.25 to 1.0 μm over k = 1 to 5. At a film thickness of 1.0 μm, calculations indicate that approximately 10% resolution loss would be expected for solutes with k = 1.
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  • 64
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    Journal of High Resolution Chromatography 7 (1984), S. 433-435 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 65
    ISSN: 0935-6304
    Keywords: Low and high resolution liquid chromatography ; Gas chromatography ; Capillary columns ; Alkali flame detection ; Chemical ionization mass spectrometry ; Nitro-PAHs ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Additional Material: 7 Ill.
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  • 66
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; General methods of nucleotide HPLC ; Molecular and ionic basis of separation ; Two-dimensional separation ; Stationary phase; selectivity to nucleotide size and composition, selectivity control ; Mobile phase (solvent, salt, pH), influence on retention and selectivity ; Guard-column functions ; Column loadability and packing, consolidation of bed particles ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In order to develop efficient separation methods for nucleotides according to their size and heterocyclic composition, the application of ion-exchange, reverse-phase, and normal-phase adsorption HPLC has been studied. The comparative investigation of retention power and selectivity of various packings (non-polar bonded-phase and amino silicas) in relation to nucleotide length and composition yields data which enable suitable packings to be selected and a method of preparing the new packing for a particular separation problem to be formulated. Thus a new anion exchanger with high selectivity and dynamic mass transfer has been prepared for fractionation of large oligonucleotides. The effect of the eluent pH and composition (organic modifier, salt) on retention, selectivity, and resolution in ion-exchange and reverse-phase HPLC has been studied. The optimum separation conditions comprise elution with oppositely directed gradients of the salt and the modifier, use of a precolumn packing that provides the best protection for the main column without loss of its efficiency, and the optimum gradient program for the desired retention of the component of interest. The relation between loading and sample concentration has been studied and the system for gradient elution improved. Our work shows that two-dimensional separation is the most reliable and informative method for preparation of homogeneous oligonucleotides. The hydrophobic-pair ion-exchange mechanism is proposed for ion-pair chromatography. Protected and partially deblocked oligonucleotides, chemically synthesized for genetic engineering studies, have been separated with high selectivity by adsorption (normal-phase) HPLC which is efficient for gradient elution with isohydric eluents. The analysis of a monomeric composition of nano-(pico-) molar amounts of oligonucleotides has been developed; the procedure involves microcolumn digestion of the oligonucleotides with immobilized enzymes followed by microcolumn separation of the nucleoside-mononucleotide mixture. Also, a new slurry method for packing stable HPLC columns with a tightly consolidated, nonshrinkable bed of particles has been developed.
    Additional Material: 31 Ill.
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  • 67
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    Journal of High Resolution Chromatography 7 (1984), S. 558-562 
    ISSN: 0935-6304
    Keywords: Gas chromatography, GC ; Capillary columns, glass ; On-column injection ; Sugars ; Oligosaccharides ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Sugars were separated gas chromatographically on short apolar glass capillary columns by using cold, on-column injection (OCI) techniques. After silylation, oligomers up to the hexasaccharides could be efficiently separated in resonable retention times. Response factors of silylated sugars were determined as a function of varying sample amounts and concentrations. The optimum injection amount was found to be 1 μl in heptane as solvent.
    Additional Material: 5 Ill.
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  • 68
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    Journal of High Resolution Chromatography 7 (1984), S. 580-581 
    ISSN: 0935-6304
    Keywords: Ion chromatography, IC ; Steel surface analysis ; Carbonate, chloride, nitrite ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 69
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    Journal of High Resolution Chromatography 7 (1984), S. 587-589 
    ISSN: 0935-6304
    Keywords: Gas chromatography, GC ; Packed glass columns ; Solvent extraction ; Plastics ; Ethylene oxide ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 70
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    Journal of High Resolution Chromatography 7 (1984), S. 597-598 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 71
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    Journal of High Resolution Chromatography 7 (1984), S. 620-624 
    ISSN: 0935-6304
    Keywords: Gas chromatography, GC ; Glass capillary columns ; Immobilization ; Gamma radiation ; Very thick films ; Nonpolar stationary phases ; OV-1, OV-101, SE-54 ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Borosilicate glass capillaries, silylated and coated with OV-1 or SE-54, were irradiated by a 60Co gamma source. The effect of radiation on chromatographic performance was determined for a series of dosages and was evaluated before and after rinsing with solvent. Results for both regular and thick films were obtained.
    Additional Material: 3 Ill.
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  • 72
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    Journal of High Resolution Chromatography 7 (1984), S. 538-539 
    ISSN: 0935-6304
    Keywords: Thin-layer chromatography, TLC ; Alkylchlorosilanes ; Prostaglandins ; Hydroxyelcosatetraenoic acids ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 73
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    Journal of High Resolution Chromatography 7 (1984), S. 641-643 
    ISSN: 0935-6304
    Keywords: Gas chromatography, GC ; Fused silica capillary columns ; Bonded stationary phase ; Distilled beverages ; Direct analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 74
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    Journal of High Resolution Chromatography 7 (1984), S. 649-652 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 75
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    Journal of High Resolution Chromatography 7 (1984), S. 671-678 
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Isomer separation ; Mutagenic compounds ; Nitropolycyclic aromatic hydrocarbons ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Since positional isomers of several nitro-polycyclic aromatic hydrocarbons (nitro-PAH) contain widely different mutagenic properties, methods for separating the isomers were investigated. High performance liquid chromatography with dichloromethane in hexane on silica gave the best resolution for the majority of the compounds. A few groups of isomers were better resolved with other modifiers or with reversed phases. Of the reversed phase systems, methanol-water gave better resolution than acetonitrile-water. With dichloromethane/hexane on silica, the retention was found to depend on the presence of a bay nitro group (first), the number of H atoms peri to the nitro group (second), and the length/breadth ratio of the molecule (third).Front electron density calculations were combined with the structure-retention relations in making tentative structure assignments of minor isomers of nitro-PAH.
    Additional Material: 12 Ill.
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  • 76
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 700-701 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Glass capillary columns ; Immobilization ; 60Co gamma radiation ; Medium-polarity phase ; OV-1701-Vi ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 77
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 712-713 
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Ion-Pair, reverse phase ; Sulfate analysis ; Lead acid batteries ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 78
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    Journal of High Resolution Chromatography 7 (1984), S. 719-720 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 79
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    Journal of High Resolution Chromatography 7 (1984), S. 697-699 
    ISSN: 0935-6304
    Keywords: Gas chromatography, GC ; Capillary columns, 100 μm I.D. ; On-column injector ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
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  • 80
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    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 707-709 
    ISSN: 0935-6304
    Keywords: Supercritical fluid chromatography, SFC ; Diffuse reflectance infrared spectrometry ; Fourier transform infrared spectrometry ; Spectrometry/chromatography interface ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
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  • 81
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    Journal of High Resolution Chromatography 7 (1984), S. 185-190 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary columns ; Mass spectrometry ; Dynamic headspace ; Deans switching ; Cold trap ; Reinjection ; Polymers ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Additional Material: 6 Ill.
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  • 82
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    Journal of High Resolution Chromatography 7 (1984), S. 196-202 
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; LC/MS ; Mass spectrometry ; Field desorption ; Chemical ionization ; Gossypol ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Conditions are reported for the reverse-phase HPLC analysis of gossypol and of some of its derivatives, including anhydrogossypol, gossypolone, gossypol hexaacetate, and Schiff's base derivatives. It is shown that field desorption (FD) and chemical ionization (CI) mass spectrometry have advantages over electron impact (EI) mass spectrometry for the characterization of these compounds and that combined high-performance liquid chromatography/mass spectrometry (LC/MS), especially when used in the CI mode, is particularly effective.
    Additional Material: 12 Ill.
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  • 83
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    Journal of High Resolution Chromatography 7 (1984), S. 215-217 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, fused silica ; Coupled columns ; Halogenated organic pollutants ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
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  • 84
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    Journal of High Resolution Chromatography 7 (1984), S. 225-226 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 85
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    Journal of High Resolution Chromatography 7 (1984), S. 218-219 
    ISSN: 0935-6304
    Keywords: High-speed micro-HPLC ; Rapid Identification ; Polycyclic aromatic hydrocarbons ; Environmental sample ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 86
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    Journal of High Resolution Chromatography 7 (1984), S. 222-224 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Interface ; Partition ; Adsorption ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 87
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    Journal of High Resolution Chromatography 7 (1984), S. 232-244 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 8 Ill.
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  • 88
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    Journal of High Resolution Chromatography 7 (1984), S. 252-257 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: After having witnessed, over a period of more than 20 years, the extremely difficult early development of capillary gas chromatography, the growth of scientific understandign, and finally its sudden blossoming into a commonly accepted technique, the author is confronted with a dichotomy. On the one hand, there are the dramatic advances in the fields of column preparation, and of sampling techniques. Implementation of these advances should logically result in correspondingly drastic progress in the average quality of application work in drastic progress in the average quality of application work in capillary gas chromatography. On the other hand, however, such progress is lacking. The greater the practical potential, the smaller the fractionm of that potential which is practically exploited. The reason is that most users interpret te recent advances as exempting them from their obligation to know and think about the many details of practical work, and to attempt standardized work with standard columns and techniques. Standardization of routine work is beneficial, provided the standards are optimized-a condition which all too often remains unfulfilled. Research work, performed in a realm of ever new and unknown conditions, is of poor quality when done by standardized means. Since the most critical part of optimization is column selection, the capillary column must be mastered as a familiar tool in the hands of the investigator. This is hardly possible in the absence of any direct contact with column technology.
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  • 89
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    Journal of High Resolution Chromatography 7 (1984), S. 258-264 
    ISSN: 0935-6304
    Keywords: Gas-liquid chromatography ; Packed and capillary columns ; Plasma anaysis ; Pharmacokinetic studies ; Benzodiazepines ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A sensitive gas-liquid chromatographic assay was developed for plasma determinations of flurazepam (F), N1-desalkylflurazepam (DF), and N1-hydroxyethylflurazepam (HF). The internal standards used were delorazepam for F and DF and 1 ã-hydroxymidazolam for HF. Following extraction and derivatization for HF, these compounds were analyzed by ECD-GLC, using either glass packed columns (poly A 103 for F and DF, OV 225 for HF) or CP-Sil 5 capillary columns for DF and HF. The detection limit of the packed-column assay was approximately 3ng/ml for HF and DF, and 5ng/ml for F; with capillary GLC analysis, the sensitivity limit for HF and DF was lower than 1 ng/ml. These methods were used for pharmacokinetic investigations after i. v. administration of these compunds.
    Additional Material: 4 Ill.
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  • 90
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    Journal of High Resolution Chromatography 7 (1984), S. 276-278 
    ISSN: 0935-6304
    Keywords: HPLC, Packed microbore columns ; Band broadening and flow rate ; Calculated van Deemter plot ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
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  • 91
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    Journal of High Resolution Chromatography 7 (1984), S. 282-283 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Gas analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 92
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    Journal of High Resolution Chromatography 7 (1984), S. 286-288 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 93
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    Journal of High Resolution Chromatography 7 (1984), S. 296-300 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 9 Tab.
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  • 94
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    Journal of High Resolution Chromatography 7 (1984), S. 306-311 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary columns ; Thermodesorption ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Additional Material: 3 Ill.
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  • 95
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    Journal of High Resolution Chromatography 7 (1984), S. 333-333 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 96
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    Journal of High Resolution Chromatography 7 (1984), S. 334-335 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Fused-Silica columns ; Thermal stability ; Dibenzothiophene oxides ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
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  • 97
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    Journal of High Resolution Chromatography 7 (1984), S. 340-342 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Sample preparation ; Closed loop stripping analysis ; Charcoal adsorbent filter ; Overcoming contamination ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 98
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    Journal of High Resolution Chromatography 7 (1984), S. 352-352 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 99
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    Journal of High Resolution Chromatography 7 (1984), S. 356-357 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 100
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    Journal of High Resolution Chromatography 7 (1984) 
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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