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  • man  (22)
  • Chromatographie, Dünnschicht  (18)
  • oxidation  (12)
  • Springer  (52)
  • National Academy of Sciences
  • Periodicals Archive Online (PAO)
  • 1975-1979  (52)
  • 1975  (52)
Collection
Keywords
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  • Springer  (52)
  • National Academy of Sciences
  • Periodicals Archive Online (PAO)
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  • 1975-1979  (52)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of di-n-propylacetate in epileptic patients (1975)
    Springer
    European journal of clinical pharmacology 8 (1975), S. 97-105 
    Details
    ISSN: 1432-1041
    Keywords: Di-n-propylacetate ; 2-propyl-valeric acid sodium salt ; pharmacokinetics ; anti-epileptic ; drug monitoring ; man
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of the anti-epileptic drug di-n-propylacetate (DepakineR) have been studied in 7 patients, in whom plasma concentrations were determined during and following subchronic treatment. Elimination of the drug appeared to follow a monophasic exponential course; biological half lives were 8 to 15 hours. The data supported the assumption that an open one-compartment model can be used to describe the kinetics of dipropylacetate in man. The drug appeared to have a relatively restricted distribution: calculated relative distribution volumes ranged from 0.15 to 0.40 1/kg. There were large interindividual differences in clearance rate. The therapeutic range was considered to be between 50 and 100 mg/1 plasma. Plasma levels of phenobarbital were markedly raised during treatment with dipropylacetate for an unknown reason. Determination of the plasma concentrations of drugs at accurately fixed times appears to be a reliable method for pharmacotherapeutic monitoring of epileptic patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00561557
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  • 2
    Electronic Resource
    Electronic Resource
    Correlation between increased dopamine-β- hydroxylase activity and catecholamine concentration in plasma: Determination of acute changes in sympathetic activity in man (1975)
    Springer
    European journal of clinical pharmacology 8 (1975), S. 181-188 
    Details
    ISSN: 1432-1041
    Keywords: Sympathetic activity ; plasma catecholamine concentration ; dopamine-β-hydroxylase activity ; graded physical exercise ; heart rate ; man
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary In 11 healthy untrained volunteers the increase in plasma dopamine-β-hydroxylase (DBH) activity during graded physical exercise has been examined as a true measure of increased activity of the sympathetic nervous system. The correlation between DBH activity, catecholamine concentration (CA) in plasma and heart rate was studied. When work on an electrically braked bicycle ergometer was gradually increased from 12.5 to 100, 200 and 300 watts there was a linear increase in DBH activity and heart rate; the increase in CA concentrations followed an exponential function. The peak values for DBH activity and CA concentration in plasma after the 300 watt work load (as percentages of the resting levels) were 130±3% and 820±71%, respectively; the adrenaline concentration in plasma increased only to 150±19% (p〉0.05). There were significant correlations between heart rate and work load, DBH and work load and log CA and work load. The data imply direct correlations between heart rate and DBH, heart rate and log CA and DBH and log CA. The exponential increase in noradrenaline concentration in plasma might be due either to a greater net “overflow” from sympathetic nerve endings, and/or to increased secretion by the adrenal medulla. In the latter case, the release of noradrenaline would not be accompanied by secretion either of adrenaline or DBH. After work ceased there were sharp falls in heart rate and CA concentration, which indicate an immediate drop in sympathetic activity. DBH activity in plasma returned to normal very slowly; it reached half maximum values after 20 – 22 min. It is concluded that increased sympathetic activity in man can be estimated in vivo as changes in DBH and/or CA concentration in plasma. In contrast, a rapid decrease in sympathetic activity is directly reflected only by a rapid fall in the plasma concentrations of CA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567112
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  • 3
    Electronic Resource
    Electronic Resource
    Bioavailability of m-octopamine in man related to its metabolism (1975)
    Springer
    European journal of clinical pharmacology 8 (1975), S. 33-39 
    Details
    ISSN: 1432-1041
    Keywords: m-octopamine ; metabolism ; first-pass effect ; man ; enteric absorption ; monohydroxylated phenylalkylamines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The diminished sympathomimetic pressor activity of monohydroxylated phenylalkylamines after oral administration has been attributed to incomplete enteric absorption. Therefore, urinary excretion of the unchanged drug and its metabolites has been compared after intravenous and oral administration of3H-m-octopamine to eight patients. Identical amounts of3H-activity (80% of the dose) were excreted after the two routes of dosing, so enteric absorption has been assumed to be complete. Significant differences were found in the fraction of free urinarym-octopamine, which amounted to 10.5% of the dose after infusion and 0.58% after oral administration. The only metabolic pathways form-octopamine are deamination and conjugation. Following oral administration the percentage of conjugates was considerably higher than after intravenous infusion. This metabolic pattern appears typical of all phenylalkylamines with a hydroxyl group in themeta position. Ring hydroxylation to catecholamines was not observed. The enzymes mainly responsible for conjugation after oral administration are located in the gut wall. The resulting “first pass effect”, i.e. metabolism prior to the access to the central compartment, can account for the diminished pharmacodynamic effect after dosing by this route.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616412
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  • 4
    Electronic Resource
    Electronic Resource
    Excretion of norephedrine by man after oral administration of oxyfedrine (1975)
    Springer
    European journal of clinical pharmacology 8 (1975), S. 161-166 
    Details
    ISSN: 1432-1041
    Keywords: Oxyfedrine ; norephedrine ; man ; urinary excretion ; sympathomimetic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary After oral administration of oxyfedrine to healthy volunteers, norephedrine was identified in the urine by thin layer chromatography and gas liquid chromatography and mass spectrography. 30 hours after single oral doses of 8, 16 or 24 mg of oxyfedrine, about 4, 8 and 9 mg, respectively, of norephedrine were found in the urine, i.e. on a molar base 75–100% of the dose was excreted as norephedrine. The peak of excretion occurred within 2–4 hours after administration of the drug. No accumulation of oxyfedrine and/or its metabolite was observed after administration of 16 mg of oxyfedrine t.i.d. for three days. It could not be decided whether oxyfedrine was metabolized to norephedrine by liver enzymes, as in rats, or was spontaneously degraded to norephedrine, e.g. in duodenal fluid before absorption. 30–150 min after oral oxyfedrine (24 mg) norephedrine was demonstrable in duodenal fluid. Thus, in addition to the directβ-sympathomimetic effects of oxyfedrine, it may also have indirect sympathomimetic effects because of the noradrenaline-releasing properties of its metabolite norephedrine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567109
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  • 5
    Electronic Resource
    Electronic Resource
    Pharmacokinetics and side-effects of clonazepam and its 7- amino-metabolite in man (1975)
    Springer
    European journal of clinical pharmacology 8 (1975), S. 249-254 
    Details
    ISSN: 1432-1041
    Keywords: Clonazepam ; 7-amino-clonazepam ; pharmacokinetics ; side-effects ; man
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Clonazepam (CNP) and its principal metabolite in plasma, 7-amino-CNP (ACNP), have been investigated in a prospective study of 27 newly diagnosed epileptics and correlated with specified side-effects. At a daily dose of 6 mg, the average plasma levels of both substances were about 50ng/ml, and individual values ranged from 30 to about 80ng/ml. There was a linear correlation between changes in dose and the resulting plasma levels, which indicates first order elimination kinetics. Side-effects were frequent, but neither their severity nor their occurrence could be related to plasma levels or to the rate of increase in plasma concentration of the drug. Three out of five patients who developed serious dysphoria had significantly high CNP levels. The concentration of ACNP was considerably increased in four patients who subsequently suffered from withdrawal symptoms. Drug interaction with diphenylhydantoin, i.e. decreased CNP level, was observed in all five patients who received both compounds. In general it is not yet possible to define an upper limit for the plasma levels of CNP and ACNP at which toxicity occurs. In patients treated with conventional doses of CNP, measurement of plasma concentration is not required, except in special circumstances, because of the lack of correlation between plasma level and side-effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567123
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  • 6
    Electronic Resource
    Electronic Resource
    Kinetics of nortriptyline in man according to a two compartment model (1975)
    Springer
    European journal of clinical pharmacology 8 (1975), S. 343-347 
    Details
    ISSN: 1432-1041
    Keywords: Nortriptyline ; pharmacokinetics ; man ; two compartment model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Plasma concentrations of nortriptyline have been assayed in four subjects after intravenous infusion of 57 mg nortriptyline hydrochloride. The data were evaluated according to a two compartment open model. The calculated best-fitting curves were in good agreement with the experimental data, better than could be expected from a simpler model. This justifies the assumption that the kinetics of nortriptyline in man may be described by this model with an appropriate input function. The data permitted estimation of all the parameters of the model. The meaning of the parameters is discussed, particularly in relation to individual variation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00562660
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  • 7
    Electronic Resource
    Electronic Resource
    Delayed absorption of lithium in intoxication (1975)
    Springer
    European journal of clinical pharmacology 8 (1975), S. 285-285 
    Details
    ISSN: 1432-1041
    Keywords: Lithium ; intoxication ; man ; delayed absorption ; gastric contents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary A 55-year old man with lithium intoxication showed increasing serum concentrations in spite of forced diuresis and dialysis. A high lithium content was found in gastric juice three days after the compound had been taken. The serum lithium level began to fall after gastric lavage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567130
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  • 8
    Electronic Resource
    Electronic Resource
    Plasma concentrations and urinary excretion of the antiarrhythmic quaternary ammonium compound QX-572 in man (1975)
    Springer
    European journal of clinical pharmacology 8 (1975), S. 277-282 
    Details
    ISSN: 1432-1041
    Keywords: QX-572 ; quaternary ammonium compound ; plasma level ; urinary excretion ; man ; anti-arrhythmic drug
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary A quantitative thin layer chromatographic (TLC) method has been developed for determination of the antiarrhythmic quaternary ammonium compound N, N-bis (phenylcarbamoylmethyl) dimethylammonium chloride (QX-572) in biological materials. Prior to chromatography QX-572 was transferred into chloroform as perchlorate by ion pair extraction. Tritium-labelled QX-572 was used as the internal standard and a TLC scanning spectrophotometer equipped with a linear detector system afforded the required accuracy, specificity and simplicity. The method was used to determine QX-572 in plasma from 11 patients with various cardiac diseases who received QX-572 8 mg/kg body wt. as an intravenous infusion over 30 min. There was a rapid initial decay of the plasma levels from 11.0±1.1 µg/ml (mean ± SE) at the end of infusion to 3.5±0.5 µg/ml after 30 min. 240 min after commencement of the infusion the plasma level was 0.7±0.1 µg/ml. In these patients 22±2% (mean±SE) of the total administered dose of QX-572 was excreted unchanged in urine during the 24 hours following infusion of the drug. A second group of 28 patients with acute myocardial infarction also received QX-572 8 mg/kg body wt. Their plasma levels did not differ significantly from those found in the first group of patients. There was a poor correlation between the amount of QX-572 administered and plasma level at the end of the infusion. The study has provided some preliminary data about the pharmacokinetics of QX-572, but before a detailed analysis can be done data from longer periods of observation is required. The present results suggest that in future QX-572 can be administered in a standardized dosage, what would be advantageous in practice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567128
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  • 9
    Electronic Resource
    Electronic Resource
    Biotransformation and pharmacokinetics of sulfinpyrazone (Anturan®) in man (1975)
    Springer
    European journal of clinical pharmacology 9 (1975), S. 135-145 
    Details
    ISSN: 1432-1041
    Keywords: Anturan® ; 14C-label ; man ; pharmacokinetics ; biotransformation ; C-glucuronidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The absorption, biotransformation and elimination of sulfinpyrazone, 1,2-diphenyl-3,5-dioxo-4-(2′-phenylsufinylethyl)-pyrazolidine, have been studied by administration of single 200 mg oral doses of a14C-labelled preparation to two male volunteers. Absorption from the gastro-intestinal tract was rapid and complete and the plasma concentration of unchanged drug reached maximum values of 22.67 and 13.04 µg/ml, respectively, after 1 – 2 hours. The elimination half-life in the two subjects, calculated from the decline between 3 and 8 hours, was 2.7 and 2.2 hours. The integrated concentration of unchanged sulfinpyrazone in plasma, estimated from the area under the concentration curves (AUC), was almost as high as that of total14C-substances, so the proportion of metabolized drug in plasma was low. In no case did the AUC of the three specifically determined metabolites, i.e. the sulphone G 31 442, the “para-hydroxy”-compound G 32 642 and the “4-hydroxy”-compound GP 52 097, exceed 4% of the sulfinpyrazone value. More than 95% of whole blood radioactivity was confined to plasma. The oral dose was rapidly and completely excreted, since within 4 days more than 95% was recovered, 85% from urine and 10% from faeces. A large proportion of the dose was excreted as unchanged drug in the two volunteers: 51 and 54% of total urinary radioactivity was present as sulfinpyrazone; 8.2 and 8.8% was present as “para-hydroxy”-metabolite, 2.7 and 3.0% as sulphone-metabolite, and 0.6 and 0.8% as “4-hydroxy”-metabolite. About 30% of urinary radioactivity consisted of highly polar metabolites. Spectroscopy of them showed that they were the C-β-glucuronides of sulfinpyrazone (28%) and the corresponding sulfone (2%). In these metabolites the C(4) of the pyrazolidine ring was directly attached to glucuronic acid, and thus they represent a new type of biosynthetic conjugate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00614010
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  • 10
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of the anticonvulsant drug clonazepam evaluated from single oral and intravenous doses and by repeated oral administration (1975)
    Springer
    European journal of clinical pharmacology 9 (1975), S. 155-159 
    Details
    ISSN: 1432-1041
    Keywords: Anticonvulsants ; benzazepines ; clonazepam ; pharmacokinetics ; gas chromatography ; man
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Eight healthy volunteers were given single i.v. and oral doses of clonazepam (2 mg). The disposition curves after i.v. administration showed a biexponential decline and the data were applied to a two-compartment open model. The volume of distribution ((Vd)β) ranged between 1.5 and 4.4 l/kg and the plasma half-life (t1/2) between 19 and 60 hours. Absorption after oral administration was fast, with peak plasma concentrations within 4 hours in all subjects. Five of the subjects received repeated oral doses of clonazepam 0.5 mg bid for 15 days. The plasma level during steady state (estimated as Cmin within the dose interval) could be predicted from the constants A, B, α and β obtained in the single dose study with a coefficient of variation of 6%. The plasma half-lives after cessation of the subchronic dosing were of the same magnitude as after single doses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00614012
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  • 11
    Electronic Resource
    Electronic Resource
    The metabolism of (−)-ephedrine in man (1975)
    Springer
    European journal of clinical pharmacology 9 (1975), S. 193-198 
    Details
    ISSN: 1432-1041
    Keywords: (−)-[14C]-ephedrine ; metabolism ; urinary excretion ; tolerance ; man
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The metabolic fate of orally administered (−)-[14C]-ephedrine has been studied in 3 human subjects and the urinary excretion of metabolites determined quantitatively by solvent extraction, paper chromatography and reverse isotope dilution procedures. Following an oral dose of the drug (0.35 mg/kg, 1.6 µCi), 97% of the dose was excreted in the urine within 48 h, 88% in the first 24 h. Unchanged drug was the major urinary excretory product (53–74%), with N-demethylation occurring to a variable extent (8–20%) although there was little interindividual variation in urine pH. Oxidative deamination was also variable (4–13%); the main identified products of this were benzoic acid (free and conjugated) and 1,2-dihydroxy-1-phenylpropane (free and conjugated). No phenolic metabolites could be detected, and thus it would appear that these compounds cannot be implicated in the acquisition of tolerance to ephedrine which can occur on repeated dosage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00614017
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  • 12
    Electronic Resource
    Electronic Resource
    Induction of drug metabolism in man after rifampicin treatment measured by increased hexobarbital and tolbutamide clearance (1975)
    Springer
    European journal of clinical pharmacology 9 (1975), S. 219-227 
    Details
    ISSN: 1432-1041
    Keywords: Rifampicin ; induction of drug metabolism ; hexobarbital kinetics ; tolbutamide kinetics ; plasma concentrations ; man
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Five healthy volunteers took 1.2 g rifampicin daily for 8 days, and before and afterwards each received hexobarbital (7.32 mg/kg) and tolbutamide (20 mg/kg) by i.v. infusion on two consecutive days. The plasma concentrations of the two drugs were determined during and after infusion. The average elimination half-life of hexobarbital had decreased from 325 to 122 min and of tolbutamide from 418 to 183 min following rifampicin treatment. It was calculated that the metabolic clearance of hexobarbital had increased about three-fold and that of tolbutamide more than two-fold. Significant changes in the distribution kinetics of the two drugs were not observed. The results suggest that rifampicin is capable of inducing drug metabolism in man, which leads to an increased rate of elimination of drugs that undergo biotransformation in the liver.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00614021
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  • 13
    Electronic Resource
    Electronic Resource
    Disposition of quercetin in man after single oral and intravenous doses (1975)
    Springer
    European journal of clinical pharmacology 9 (1975), S. 229-234 
    Details
    ISSN: 1432-1041
    Keywords: Quercetin ; flavonoids ; pharmacokinetics ; absorption ; disposition ; metabolism ; man
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of quercetin, a flavonoid, have been studied in 6 volunteers after single intravenous (100 mg) and oral (4 g) doses. The data after iv administration were analyzed according to a two compartment open model with half lives of 8.8±1.2 min for the α phase and 2.4±0.2 h for the β phase (predominant half life), respectively. Protein binding was 〉98%. The apparent volume of distribution was small at 0.34±0.03 l/kg. Of the intravenous dose 7.4±1.2% was excreted in urine as a conjugated metabolite, and 0.65±0.1% was excreted unchanged. After oral administration no measurable plasma concentrations could be detected, nor was any quercetin found in urine, either unchanged or in a metabolized form. These results exclude absorption of more than 1% of unchanged drug. Recovery in faeces after the oral dose was 53±5%, which suggests extensive degradation by microorganisms in the gut. The data obtained show that oral administration of flavonoids may be of questionable value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00614022
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  • 14
    Electronic Resource
    Electronic Resource
    Effects of dixyrazine and methaqualone on the sleep pattern in normal man (1975)
    Springer
    European journal of clinical pharmacology 8 (1975), S. 227-231 
    Details
    ISSN: 1432-1041
    Keywords: Dixyrazine ; methaqualone ; etodroxizine ; Isonox® ; sleep stages ; man
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Whole night EEG and polygraphic recordings were made in ten young, healthy, male volunteers after dixyrazine (12.5 mg, 25 mg, 50 mg), methaqualone (250 mg) and Isonox® (methaqualone 250 mg + etodroxizine 50 mg). A total of 156 recording nights (36 adaptation nights were not included in the analyses) were scored for different sleep stages according to accepted criteria. The smallest dose of dixyrazine (12.5 mg) had no significant effect upon sleep pattern: the larger doses (25 mg and 50 mg) caused significant decreases in REM-sleep during the first nights of administration. The decrease disappeared during the following two nights of treatment. No withdrawal effects were seen. Methaqualone also caused moderate depression of REM-sleep during the first night of treatment, and this effect, too, disappeared during prolonged administration. Isonox® (methaqualone + etodroxizine) had a somewhat stronger surpressive effect upon REM-sleep than methaqualone alone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567120
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  • 15
    Electronic Resource
    Electronic Resource
    Distribution and elimination kinetics of carbamazepine in man (1975)
    Springer
    European journal of clinical pharmacology 8 (1975), S. 91-96 
    Details
    ISSN: 1432-1041
    Keywords: Carbamazepine ; pharmacokinetics ; man ; diphenylhydantoin ; phenobarbital ; plasma binding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Carbamazepine (2.7–3 mg/kg) was administered orally as an alcoholic solution (50% v/v) to eight healthy volunteers. Two of the subjects were also given 50 mg and 100 mg of carbamazepine in alcoholic solution and 200 mg as a tablet. Plasma concentrations, which were analysed by mass fragmentography, reached a maximum 1 – 7 hours after dosing, and then declined monoexponentially with half-lives ranging from 24 to 46 hours. The half-lives were independent of dose. The apparent distribution volume ranged from 0.79 to 1.40 l/kg. It was found that 72% of carbamazepine was bound to plasma proteins with little interindividual variation, and this was not influenced by the presence of diphenylhydantoin or phenobarbital in therapeutic concentrations. The pharmacokinetic parameters calculated from single oral doses were used to predict the steady-state plasma concentration expected after treatment with multiple doses of 200 mg three times daily. The predicted steady-state concentration was 2 – 3 times higher than that reported in patients undergoing chronic treatment with carbamazepine at this dose level, i.e. the pharmacokinetics of carbamazepine apparently change during multiple dosing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00561556
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  • 16
    Electronic Resource
    Electronic Resource
    Haemodynamic effects of intravenous disopyramide in heart failure (1975)
    Springer
    European journal of clinical pharmacology 8 (1975), S. 167-173 
    Details
    ISSN: 1432-1041
    Keywords: Disopyramide ; haemodynamic effect ; negative inotropic effect ; anticholinergic effect ; hear failure ; man
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The haemodynamic effects of disopyramide have been studied in 11 patients with manifest or imminent heart failure. Disopyramide, 2 mg per kg body weight, was given intravenously during right and left heart catheterisation. The cardiac index decreased by an average of 28% (p〈0.01); mean maximal left and right ventricular end-diastolic pressures were increased by 5.0±0.9 mm Hg (〈0.01) and 5.0±0.6 mm Hg (p〈0.05), respectively; and left ventricular systolic pressure fell slightly but significantly (p〈0.05). No significant change in right ventricular systolic pressure was seen. Pulmonary wedge pressure rose on average by 2.7 mm Hg (p〈0.05). No significant change in heart rate was observed in 5 patients with sinus rhythm. In 6 patients with atrial fibrillation, there was a significant (p〈0.01) increase in heart rate; the average increase in heart rate for the entire group was 19,6 heats per minute. The maximum effect on all the parameters occurred 7–11 minutes after the injection, and it gradually subsided during the following 10 minutes. It was concluded that disopyramide had a potentially serious myocardial depressant effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00567110
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  • 17
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of chlormethiazole in humans (1975)
    Springer
    European journal of clinical pharmacology 8 (1975), S. 353-357 
    Details
    ISSN: 1432-1041
    Keywords: Chlormethiazole ; pharmacokinetics ; man ; plasma levels ; gas-liquid chromatography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of chlormethiazole have been studied in six healthy volunteers following an intravenous infusion of the drug. The log. plasma concentration-time curve of chlormethiazole after cessation of the infusion was found to be curvilinear and was fitted therefore, by a bi-exponential equation computed by non-linear least squares regression analysis. Half-lives for the inital α-phase (0.54±0.05 h) and the terminal β-phase (4.05 ±0.60 h) were calculated together with other pharmacokinetic parameters of the two compartment open model. An explanation for the discrepancy between the presently reported plasma half-lives and those appearing in the literature has been presented. The pharmacokinetic treatment of the plasma concentration-time data obtained following intravenous infusion also enabled the prediction that the maximal systemic availability of an orally administered dose of chlormethiazole would be of the order of 15%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00562662
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  • 18
    Electronic Resource
    Electronic Resource
    Bioavailability studies with Digoxin-Sandoz® and Lanoxin® (1975)
    Springer
    European journal of clinical pharmacology 8 (1975), S. 371-376 
    Details
    ISSN: 1432-1041
    Keywords: Digoxin ; bioavailability ; plasma levels ; cumulative urinary excretion ; particle size ; man
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Various brands of digoxin tablets, and even different batches of one brand, may differ greatly in bioavailability. Digoxin-Sandoz® tablets have been compared with Lanoxin® manufactured between 1969 and 1972 and after May 1972. Comparisons were also made between and within batches of Digoxin-Sandoz tablets. Three separate cross-over studies were conducted involving a total of 20 volunteers. Digoxin-Sandoz tablets were shown to have a constant bioavailability and to produce plasma concentrations very similar to “new” Lanoxin. Storage for 2 years of one batch of Digoxin-Sandoz did not alter the bioavailability. Particle size was shown to influence bioavailability. Care should be exercised when plasma data alone are interpreted as an index of bioavailability. Measures of bioavailability based on plasma data obtained up to 6 h after administration differed from those based on cumulative urinary excretion data (in this study by a factor of about 2), which can lead to the belief that a difference in bioavailability is much greater than is actually the case. Data from cumulative urinary excretion, collected over a sufficiently long period of time, are likely to be the most reliable method for determining the bioavailability of a substance such as digoxin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00562665
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    On the pharmacokinetics of proscillaridin A in man (1975)
    Springer
    European journal of clinical pharmacology 8 (1975), S. 421-425 
    Details
    ISSN: 1432-1041
    Keywords: Proscillaridin ; enteric-coated tablets ; plasma levels ; urine excretion ; 86Rb-erythrocyte assay ; man
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The plasma concentration of proscillaridin was measured by a modified86Rd method during treatment with multiple doses of a commercial preparation of proscillaridin. Despite high doses, very low plasma levels were found, and there were only minute amounts of glycoside activity in urine and faeces. Administration of an enteric-coated proscillaridin preparation gave higher plasma levels, which raises the possibility of inactivation of the glycoside by acid gastric juice. The results suggest that proscillaridin has low biological availability when given orally, and that it is extensively metabolised in the body.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00562316
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  • 20
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    Haemodynamic effects of intravenous verapamil at rest and during exercise in subjectively healthy middle-aged men (1975)
    Springer
    European journal of clinical pharmacology 8 (1975), S. 317-322 
    Details
    ISSN: 1432-1041
    Keywords: Verapamil ; haemodynamics ; exercise ; man ; vascular resistance ; negative inotropism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Verapamil, 0.1 mg/kg body wt, was injected i.v. over 2 minutes in 8 subjectively healthy middle-aged men, followed by a continuous infusion of 0.007 mg/kg body wt per minute. Prior to the injection several of the subjects had raised pulmonary or systemic arterial pressures. At rest, the central pressures increased slightly, which was taken as a sign of a moderate negative inotropic effect, but there was no change in pre-ejection period or maximal dp/dt of the aortic pressure. The heart rate increased and there was a small decrease in systemic arterial pressure, probably due to a fall of systemic vascular resistance. The PQ time was prolonged. During exercise, with its positive inotropic stimulation, the moderate negative inotropic effect of verapamil disappeared, whereas the increase in heart rate and decrease in aortic pressures persisted. Some variables that reflected the oxygen demand of the heart decreased. The slight negative inotropic effect does not appear to be a particular contraindication to the use of verapamil, but it should be employed cautiously in conditions with a compensatory rise in systemic vascular resistance, or if atrioventricular conduction is impaired.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00562656
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    Plasma kinetics of carbamazepine and its epoxide metabolite in man after single and multiple doses (1975)
    Springer
    European journal of clinical pharmacology 8 (1975), S. 337-341 
    Details
    ISSN: 1432-1041
    Keywords: Carbamazepine ; carbamamazepine-10,11-epoxide ; pharmacokinetics ; induction of metabolism ; man
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Carbamazepine (Tegretol®) was administered orally to four patients as a single dose, and one week later three times daily for 15–21 days. The plasma half-lives of the drug were shorter in all patients after multiple doses (20.9±5.0 hours) than after the initial single dose (35.6±15.3 hours). During multiple doses the plasma concentrations of the metabolite carbamazepine-10,11-epoxide followed those of the parent drug. The steady-state plasma concentrations expected during multiple doses were calculated from the pharmacokinetic parameters obtained in the single dose studies. The calculated levels were higher (17.2±7.2 µg/ml) than the observed maximal concentrations (8.4±1.6 µg/ml on day 4), which were obtained 3–4 days after starting the multiple doses. The levels tended to decrease further during the experimental period. The results suggest that carbamazepine induces its own metabolism in man.
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    URL: http://dx.doi.org/10.1007/BF00562659
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  • 22
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    Metabolism and excretion of methylproscillaridin by man (1975)
    Springer
    European journal of clinical pharmacology 8 (1975), S. 427-432 
    Details
    ISSN: 1432-1041
    Keywords: Methylproscillaridin ; urinary and faecal excretion ; polar and non-polar metabolites ; man ; glucuronides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary 0.5 mg3H-proscillaridin-4-methylether was administered orally to 5 healthy males. Maximum plasma levels of total radioactivity were reached after one to two hours. In two subjects a second peak was observed between 6 and 12 hours. The plasma half life of total radioactivity was 51 hours. 20% and 56% respectively of the dose were eliminated in urine and faeces during the following 7 days. 55% of the total radioactivity in plasma, 80% in urine and 20% in faeces consisted of CHCl3-insoluble compounds. 50 – 60% of the latter in plasma and urine could be hydrolysed by β-glucuronidase. More than 90% of the split products were identified as conjugates of methylproscillaridin. TLC-separation of the CHCl3-soluble fractions of plasma and urine yielded two unidentified metabolites, P2 and P3, as the main compounds, besides methylproscillaridin, proscillaridin and scillarenin. In faeces more than 90% of the non-polar fraction was identified as methylproscillaridin. Shortly after administration of3H-methylproscillaridin, the radioactivity in plasma consisted mainly of CHCl3-in-soluble conjugates and of the metabolite P2.
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    URL: http://dx.doi.org/10.1007/BF00562317
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    The oxidation and hot corrosion behavior of tungsten-fiber reinforced composites (1975)
    Springer
    Oxidation of metals 9 (1975), S. 45-67 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; hot corrosion ; nickel alloys ; composites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation and hot corrosion behavior of a tungsten-fiber, reinforced Ni~ 20Cr alloy has been examined under the following exposure conditions: (a) pure oxygen at 1 atm pressure; (b) sulfidation in H2–10 %H2S; (c) presulfidation in H2–10 %H2S followed by oxidation in oxygen; and (d) oxidation in 1 atm oxygen after precoating with approximately 1 mg/cm2 of Na2SO4. Rapid oxidation of the tungsten fibers causes considerable distortion of the matrix and catastrophic degradation of the matrix follows. Inter diffusion between the matrix and the fibers is also important. During sulfidation, only the matrix forms sulfides, the fibers remaining unaffected. Consequently, presulfidation, although having a dramatic effect on the oxidation of the matrix does not have a damaging effect on the fibres. Equally, the presence of sodium sulfate is not critical, although severe oxidation of the exposed tungsten fibers is still observed.
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    URL: http://dx.doi.org/10.1007/BF00613494
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  • 24
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    The high-temperature oxidation of Ni-20%Cr alloys containing various oxide dispersions (1975)
    Springer
    Oxidation of metals 9 (1975), S. 275-305 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; Ni-Cr alloys ; rare-earth oxide dispersion ; dispersion-strengthened alloys
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation behavior of Ni-20%Cr alloys containing approximately 3 vol.% Y2O3, ThO2, and A12O3 as dispersed particles has been examined in the temperature range 900 to 1200° C in slowly flowing oxygen at 100 Torr. The results show that the oxidation behavior of the Y2O3-, ThO2-, Al2O3-, and Ce02-containing alloys is very similar and that some anomalies in the behavior of the ThO2-containing alloy might be explained by the slower rate of chromium diffusion in this coarse-grained alloy. Two Al2O3-containing alloys were studied. One with a relatively coarse dispersoid size behaved in a manner analogous to a dispersion-free Ni-30% Cr alloy at 1100°C. The other alloy contained a dispersion of fine Al2O3 particles and behaved exactly like the Y2O3-containing alloy at 1000 and 1100°C, but at 1200° C oxidized at a faster rate. It has been shown that the adherent scales on dispersion-containing alloys have a stabilized fine grain size, whereas the nonadherent scales on dispersion-free alloys undergo grain growth.
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    URL: http://dx.doi.org/10.1007/BF00613277
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  • 25
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    Study of the oxidation kinetics of vanadium carbide (1975)
    Springer
    Oxidation of metals 9 (1975), S. 415-425 
    Details
    ISSN: 1573-4889
    Keywords: vanadium carbide ; vanadium oxycarbide ; oxidation ; parabolic rate law ; cubic rate law ; chemisorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation of an oxycarbide of vanadium, VO0.6C0.7, and of a vanadium carbide, VC0.98, was studied athermally up to temperatures of 800° C and isothermally between 400 and 580° C at oxygen pressures ranging from 10−2 to 1 atm. The oxycarbide followed the parabolic rate law below 450° C with V2O5 forming as the only reaction product. The activation energy was 49 kcal/mole. VC0.98 did not form an oxide in this temperature range, but rather dissolved oxygen, the activation energy being 26.6 kcal/mole. No oxygen pressure dependence on the kinetics was found for either sample in this temperature range. Both samples followed the cubic rate law during oxidation in the range of 500–580° C during which V2O5 formed. There was a P1/3 dependence and the activation energy was the same for both materials, 51 kcal/mole. The cubic rate law and the positive pressure dependency (rather than an anticipated negative dependency) were attributed to an electric field associated with oxygen ions chemisorbed on a thin layer of V2O5.
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    URL: http://dx.doi.org/10.1007/BF00611690
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  • 26
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    Effect of oxide grain structure on the high-temperature oxidation of Cr (1975)
    Springer
    Oxidation of metals 9 (1975), S. 459-472 
    Details
    ISSN: 1573-4889
    Keywords: Cr ; oxidation ; kinetics ; Cr2O3 grain size ; short-circuit diffusion ; surface ; preparation ; Fe-Cr
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Cr was oxidized in 1 aim O2 at 980, 1090, and 1200°C. ElectropolishedCr and some orientations of etched Cr oxidize rapidly and develop compressive stress in the growing Cr2O3; other orientations oxidize slowly, apparently free of stress. SEM examination of fracture sections shows that the thick oxide is polycrystalline whereas the thin oxide on etched Cr is monocrystalline. It is deduced that the monocrystalline oxide grows by lattice diffusion of cations outward, and the polycrystalline layer by the two-way transport of cation diffusion outward and anion diffusion inward along oxide grain boundaries. The consequent formation of oxide within the body of the polycrystalline layer generates compressive stress and leads to wrinkling by plastic deformation. The activation energy for oxidation of Cr by cation lattice transport is 58 kcal/mole. Polycrystalline Cr2O3 forms on Fe-26Cr alloy, whether electropolished or etched; oxidation is accordingly rapid and accompanied by compressive stress.
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    URL: http://dx.doi.org/10.1007/BF00611694
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  • 27
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    The oxidation and decarburizing of Fe-C alloys in air and the influence of relative humidity (1975)
    Springer
    Oxidation of metals 9 (1975), S. 69-97 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; decarburization ; Fe-C alloys ; effect of humidity ; effect of microstructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Isothermal oxidation treatments were carried out on an Fe-C alloy (0.4 % C): (a) in almost dry air around A1, and also with an Fe-C alloy (0.5% C) and IRSID pure iron; (b) in dry air ( $${\text{P}}_{H_2 O} \simeq 10^{ - 5} $$ nm Hg); (c) in almost dry air(1–2% water vapor) at 700° C; and (d) in moist air (31% water vapor). Theresults are as follows: The rate of oxidation at a temperature below A1depends chiefly on alloy structure, i.e., on thermal history of the sample.The water vapor content of the air strongly influences the scale adherenceas well as the rate of oxidation of the Fe-C alloys below A1, but has virtuallyno effect on the rate of oxidation of pure iron. Under the same conditions, avery light decarburization of metal occurs in air, whereas no decarburizationoccurred in air with 13% water vapor.
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    URL: http://dx.doi.org/10.1007/BF00613495
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    The oxidation behavior of an aligned Co-TaC eutectic alloy (1975)
    Springer
    Oxidation of metals 9 (1975), S. 225-257 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; eutectic alloys ; refractory metals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation behavior of the directionally aligned eutectic alloy, TaC-Co50B, has been examined between 600 and 1155°C. Parabolic oxidation behavior, isotropic in nature, is found to 800°C. Above 800°C, the oxidation behavior is no longer either parabolic or isotropic. The interaction between the Co matrix alloy and the TaC fibers adjacent to the oxidizing interface is reported as a function of temperature in oxidation.
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    URL: http://dx.doi.org/10.1007/BF00613275
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  • 29
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    Role of kinetic effects on metal partition at the alloy-scale interface during the oxidation of alloys (1975)
    Springer
    Oxidation of metals 9 (1975), S. 215-223 
    Details
    ISSN: 1573-4889
    Keywords: cation diffusion ; oxidation ; metal partition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An alternative mass balance at the alloy-scale interface is proposed for the Wagner theory of binary alloy oxidation. A simple relation between the bulk composition of the alloy and the scale composition at the alloy-scale interface, ξ′, is derived in terms of the transport properties of the scale and the limit of application of the relation defined. There is good agreement between calculated and measured values of ξ′.
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    URL: http://dx.doi.org/10.1007/BF00613274
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    The high-temperature oxidation resistance of Co-Al alloys (1975)
    Springer
    Oxidation of metals 9 (1975), S. 427-440 
    Details
    ISSN: 1573-4889
    Keywords: cobalt ; cobalt-aluminum alloys ; oxidation ; thermal cycling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Most Ni and Co-base alloys used for high-temperature service rely on the production of a compact, stable Cr2O3 scale for their oxidation resistance. However, as operating temperatures have risen above 900–950° C, the loss of Cr2O3 as the volatile CrO3 has led to an inadequate life span of these alloys, particularly in rapidly flowing, turbulent gas streams. As a result of this, it has been necessary to examine the possibility of using Al2O3 as the protective scale. Al2O3 has a lower growth rate than Cr2O3, it is nonvolatile, and, unlike Cr-containing systems, it is less likely to form compound oxides such as spinels. In this study, the amount of Al which must be present in the Co-Al system to form a continuous layer of Al2O3 in the temperature range 800–1000° C has been determined. The quantity was found to rise from about 7–10 wt. % at 800° C to 10–13 wt. % at 900° C and 13 wt. % at 1000° C. Notice has also been taken of the abilities of the alumina-forming alloys to re-form a protective oxide in the event of spalling, blistering, or any other disruptions of the scale, and some “cyclic-oxidation” checks have been conducted on the Co13Al alloy at 900 and 1000° C.
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    URL: http://dx.doi.org/10.1007/BF00611691
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    Kinetics of the oxidation of ilmenite (1975)
    Springer
    Oxidation of metals 9 (1975), S. 99-116 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; kinetics ; ilmenite ; rutile ; pseudobrookite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation of ilmenite (FeTiO3) in air and dry oxygen was investigated over the temperature interval 600 to 970°C. Dense platelets of ilmenite crystals as well as powder samples of ilmenite were oxidized. The weight data were recorded employing a thermobalance. The oxidation kinetics of ilmenite platelets were parabolic except for the initial stages during which logarithmic kinetics were observed. For powder samples the logarithmic rate law was followed primarily. The logarithmic rate law was attributed to free penetration of oxygen through cracks and short-circuit paths. The activation energies associated with the logarithmic rate law were nearly one-half of those obtained from parabolic oxidation. The growth morphology of the products of oxidation of ilmenite was observed with a scanning electron microscope. The effect of growth morphology on the kinetics is discussed, and a probable reaction mechanism is suggested for the oxidation of ilmenite.
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    URL: http://dx.doi.org/10.1007/BF00613496
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    Mechanical stresses developed in austenitic Fe-Cr-Ni alloys by oxidation in a CO2 atmosphere (1975)
    Springer
    Oxidation of metals 9 (1975), S. 259-274 
    Details
    ISSN: 1573-4889
    Keywords: stress ; oxidation ; austenitic steel ; CO2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The stresses developed during oxidation of Fe-Cr-Ni alloys in a CO 2 atmosphere at 600 and 700°C have been estimated by measuring the deflection of thin foil specimens oxidized on one side only. One side of the specimen was protected from oxidation by an Al-Au film which was oxidized prior to the deflection experiment. The character and magnitude of the stresses measured are explained by electron microscope and x-ray measurements. During the initial stage of oxidation, high stresses are formed due to epitaxial growth of the oxide. These stresses are high enough to plastically deform the alloy. As oxidation proceeds, the stress decreases and eventually reaches a “steady-state” value. During this stage, the alteration in composition and molecular volume of the oxide, the formation of carbides, and the growth of whiskers determine the stresses.
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    URL: http://dx.doi.org/10.1007/BF00613276
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    The effect of small amounts of silicon on the oxidation of high-purity Co-25 wt. % Cr at elevated temperatures (1975)
    Springer
    Oxidation of metals 9 (1975), S. 409-413 
    Details
    ISSN: 1573-4889
    Keywords: cobalt ; cobalt-chromium alloys ; silicon ; oxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Some investigators have reported that Co-25 wt.% Cr oxidizes slowly at temperatures in the range 1000–1200°C forming a protective Cr2O3 scale; and this is the normal behavior of cobalt-base superalloys. Others have reported very rapid oxidation, forming a two-layer scale: an outer CoO layer and an inner mixture of Cr2O3 and CoCr2O4 particles in a CoO matrix. This investigation shows that the principal reason for this behavior is the purity of the material; it appears that the rapid mode of oxidation is the intrinsic behavior for high purity material. The most probable impurity to produce the slower mode is silicon, and it is shown that as little as 0.05 wt. % Si is sufficient to change the mode of oxidation provided sufficient oxygen is also present in the alloy: it seems probable therefore that a fine dispersion of SiO2 is responsible.
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    URL: http://dx.doi.org/10.1007/BF00611689
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    Dünnschicht-Chromatographie der Methylolmelamine (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 276 (1975), S. 205-207 
    Details
    ISSN: 1618-2650
    Keywords: Trenn. von Methylolaminen, Melaminharzen ; Chromatographie, Dünnschicht ; Celluloseschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Identifizierung der Komponenten in einem Methylolmelamin-Gemisch mittels Dünnschicht-Chromatographie wurde möglich, nachdem die einzelnen Methylolmelamine (Mono-, Di-, Tri-, Tetra-, Penta- und Hexamethylolmelamin) rein dargestellt werden konnten. Aus der zweidimensionalen dünnschichtchromatographischen Entwicklung des Methylolmelamin-Gemisches folgt, daß während der Dauer der Entwicklung keine Änderung der Zusammensetzung des Methylolmelamin-Gemisches stattfindet. Die Chromatographie wurde auf Celluloseschichten mit Butanol/Äthanol/Wasser (4∶1∶2) als Fließmittel und ammoniakalkalischer Silbernitratlösung als Nachweisreagens durchgeführt.
    Notes: Abstract Identification of the components in a methylolmelamine mixture by thin-layer chromatography was facilitated after obtaining each of the individual methylolmelamines (mono-, di-, tri-, tetra-, penta- and hexamethylolmelamine). By the use of two-dimensional thin-layer chromatography it was noted that no change in the composition of the mixture takes place during the time of Chromatographic development. Separation was achieved on cellulose layers using butanol/ethanol/water (4∶1∶2) as solvent and ammonia-alkaline AgNO3 solution as detection reagent.
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    URL: http://dx.doi.org/10.1007/BF00437568
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    In situ-Auswertung von Dünnschicht-Chromatogrammen über die Kubelka-Munk-Funktion (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 277 (1975), S. 105-110 
    Details
    ISSN: 1618-2650
    Keywords: Chromatographie, Dünnschicht ; Auswertung über die Kubelka-Munk-Funktion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Eine quantitative Auswertung von Dünnschicht-Chromatogrammen über die Kubelka-Munk-Funktion wird beschrieben. Die mathematische Ableitung erfolgt über zwei Ansätze: Differentialgleichung und hyperbolisch-trigonometrische Funktionen. Es zeigt sich, daß beim Zweiwellenlängen-Densitometer die Bestimmung absoluter Remissionswerte entfällt, und das erhaltene Meßsignal mit geringem Aufwand linearisiert werden kann. Die Auswertung erfolgt über die Peakhöhe, ermittelt durch Zig-Zag-Scantechnik (Shimadzu CS 900). Meß- und Vergleichswellenlänge sollen dicht beieinander liegen, um ähnliche Streukoeffizienten zu erhalten. Vermessen wird Coffein im Bereich von 0,25–20 μg, in dem die Linearisierung noch einwandfrei arbeitet. Der Fehler liegt als relative Standardabweichung bei 1,9% (c=4–20μg,n=15) bzw. 2,7% (c=0,25–2 μg,n=22).
    Notes: Abstract The mathematical derivation is given by two different statements: differential equation and hyperbolic-trigonometric functions. It is shown that measurement of absolute values of remission is inapplicable. The signal is easily to be linearized. The evaluation is given by the maximum peak value obtained by the zig-zag scan technique (Shimadzu CS 900). To get similar scatter values sample and reference wave-length should be tuned as close as possible. Caffeine is measured from 0.25 to 20 μg. In this range the linearizer works unobjectionably and the error as relative standard deviation is in the order of 1.9% (4–20 μg,n=15) and 2.7% (0.25–2 μg,n=22), respectively.
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    Thin-layer chromatography of inorganic ions as xanthates (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 277 (1975), S. 126-126 
    Details
    ISSN: 1618-2650
    Keywords: Trenn. von Anorgan. Ionen als Xanthate ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00602085
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    Nachweis von Diphenylpyralin und Metaboliten im menschlichen Urin (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 277 (1975), S. 208-208 
    Details
    ISSN: 1618-2650
    Keywords: Nachw. von Diphenylpyralin im Urin ; Chromatographie, Dünnschicht ; UV-Bestimmung, N-Oxid und Desmethylderivat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00462242
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    Hydroxylation in isolated liver cells (1975)
    Springer
    Bulletin of experimental biology and medicine 80 (1975), S. 1193-1194 
    Details
    ISSN: 1573-8221
    Keywords: isolated cells ; hydroxylation ; oxidative phosphorylation ; oxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Isolated cells were obtained by using EDTA and mechanical action to dissociate rat liver tissue. The presence of oxidative phosphorylation reactions in the hepatocytes was taken as an indication of their integrity. The hepatocytes were able to hydroxylate dimethylaniline, ethylmorphine, and aminopyrine. The maximal velocity of hydroxylation was higher in the cells than in microsomes, when calculated per nmole cytochrome P-450. The NAD·H2 formed by oxidation of glutamate and malate in isolated cells can be used for the hydroxylation reactions.
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    URL: http://dx.doi.org/10.1007/BF00833157
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    Quantitative Auswertung von Dünnschicht-Chromatogrammen: On line-Kopplung mit programmierbaren elektronischen Tischrechnern (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 273 (1975), S. 7-9 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Coffein, Phenacetin ; Chromatographie, Dünnschicht ; Spektralphotometrie ; Kopplung mit Tischrechner
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Am Beispiel der Bestimmung von Phenacetin und Coffein im pharmazeutisch verwendeten Mengenverhältnis wird die quantitative in situ-Auswertung eines Zweikomponentensystems im on line-Betrieb: Densitometer—Integrator—Tischrechner beschrieben. Die Eichgerade wird für beide Substanzen auf jeder Platte gesondert bestimmt. Durch eine Einschränkung des Konzentrationsbereichs auf obere und untere Toleranzgrenze ergeben sich Vereinfachungen der Ausgleichsrechnungen. Die erzielten Genauigkeiten liegen bei 2 Analysen pro Platte bei 1,51% (Phenacetin) und 2,56% (Coffein) bzw. bei 4 Analysen pro Platte bei 1,50% (Phenacetin) und 2,64% (Coffein) (rel. gen. Standardabweichung, n=18 bzw. n=36).
    Notes: Abstract A TLC method for the determination of phenacetin and caffeine in pharmaceutical preparations using a densitometer in line with an integrator and electronic desk calculator is described. The calibration curves of each compound were prepared where the higher and lower tolerance concentration levels were defined. The accuracy of the method is 1.51% (phenacetin) and 2.56% (caffeine) for two experiments carried out on each plate; 1.50% (phenacetin) and 2.64% (caffeine) for four experiments for each plate (relative standard deviation, n=18 and n=36, respectively).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00459396
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    Identification and determination of pentacyclic triterpenes in natural mixtures by thin-layer chromatography and densitometric evaluation (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 273 (1975), S. 127-128 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Triterpenen in Pflanzen ; Chromatographie, Dünnschicht ; densitometrisch, pentacyclische Verb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00426273
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  • 41
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    Zur Stabilität von Morphin-Injektionslösungen (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 274 (1975), S. 30-30 
    Details
    ISSN: 1618-2650
    Keywords: Aufklärung von Morphinabbauprodukten ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00440294
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  • 42
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    Gerät zur automatischen Auftragung strichoder kreisförmiger Flecke auf Dünnschichtplatten (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 274 (1975), S. 265-269 
    Details
    ISSN: 1618-2650
    Keywords: Chromatographie, Dünnschicht ; automatisches Auftragegerät, strich- und kreisförmige Flecke
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurde ein Gerät zur automatischen Auftragung von kreisoder strichförmigen Flecken auf Dünnschicht-Platten entwickelt. 8 oder mehr gleiche Volumina verschiedener Konzentration werden in vorzuwählender Zeit auf die Schicht gebracht. Dadurch erhält man reproduzierbare Flecke, die nach dem Chromatographieren direkt auf der Schicht in Remission oder Transmission gemessen werden. Konzentrationen von Komponenten in Gemischen lassen sich mit einem relativen Fehler von 2–3,5% bestimmen. Der Zeitaufwand beträgt 5–10 min.
    Notes: Abstract An automatic device for the application of spots or bands on TLC plates has been constructed. 8 or more equal volumes of different concentrations are applied to the TLC plate in preselected time. Reproducible spots or bands are obtained, which are measured by remission or transmission directly on the plate after chromatography. Concentrations of components in mixtures can be evaluated with a relative error of 2–3.5%. The time required is 5–10 min.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00424246
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  • 43
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    Katalytische Dehydrierung im Mikrogrammbereich (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 274 (1975), S. 257-264 
    Details
    ISSN: 1618-2650
    Keywords: Katalytische Dehydrierung ; Ultramikrobereich, Apparatur, TAS-Verfahren ; Thermofraktographie/TAS-Verfahren/Chromatographie, Dünnschicht ; Dehydrierung, Ultramikrobereich ; Analyse von Sesquiterpenderivaten, Terpenoiden, Steroiden ; Chromatographie, Dünnschicht ; katalyt ; Dehydrierung, TAS-Verfahren
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die direkte Kopplung einer katalytischen Dehydrierung mit der Dünnschicht-Chromatographie wird beschrieben. Die Reaktion erfolgt nach dem Prinzip der Gasphasendehydrierung durch schubweises Einspritzen der Lösung der zu dehydrierenden Verbindung in die z. B. mit Palladium-Bariumsulfat-Katalysator versehene TAS-Patrone. Die Einwaagen liegen im Bereich von 20–100 μg und die Reaktionstemperaturen je nach Verbindung zwischen 200 und 400°C. Die Reaktionsprodukte werden durch die Lösungsmitteldämpfe zur Schicht transferiert. Anschließend wird chromatographiert und die Reaktionsprodukte identifiziert. Als Anwendungsbeispiele werden Sesquiterpenkohlenwasserstoffe und -alkohole, Sesquiterpenoide des Eudesmantyps, Abietinsäure und Steroide dehydriert.
    Notes: Abstract Direct coupling of a catalytic dehydrogenation to TLC is described. The reaction takes place according to the principle of gas phase dehydrogenation by injecting the solution of the compound to be dehydrogenized in batches into the TAS-cartridge, loaded with e.g. palladium-barium sulphate catalyst. Sample size are in the range of 20–100 μg and the reaction temperatures, depending on the compound, is between 200 and 400°C. The reaction products are carried by the solvent vapours to the thin-layer and subsequently chromatographed and identified. In given examples the dehydrogenation is applied to sesquiterpene hydrocarbons and alcohols, sesquiterpenoids of the eudesman type, abietic acid and steroids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00424245
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    Dünnschicht-chromatographische Bestimmung von Nicotin und Nicotinmetaboliten im Urin (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 274 (1975), S. 300-300 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Nicotin, Cotinin, Nicotin-N-oxid in Harn ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00424253
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  • 45
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    Identifizierung von Wasserstoffperoxidlösungen an aktivierten Fertigfolien für die Dünnschicht-Chromatographie (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 274 (1975), S. 381-381 
    Details
    ISSN: 1618-2650
    Keywords: Nachw. von Wasserstoffperoxid ; Chromatographie, Dünnschicht ; Fertigfolien
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626040
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  • 46
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    Note on the detection of organic compounds with N-containing multiple functional groups on silica gel thin-layers by the chlorination method (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 275 (1975), S. 28-28 
    Details
    ISSN: 1618-2650
    Keywords: Nachw. von Organ. Verbindungen, stickstoffhaltig ; Chromatographie, Dünnschicht ; Chlorierungsreaktion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00432995
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    TLC separation of closely related phenols (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 275 (1975), S. 29-29 
    Details
    ISSN: 1618-2650
    Keywords: Trenn. von Phenolen ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00432996
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  • 48
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    Semiquantitative determination of the mycotoxin sterigmatocystin on thin-layer chromatograms with a gray scale (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 275 (1975), S. 30-30 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Sterigmatocystin ; Chromatographie, Dünnschicht ; Grauskala
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00432997
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  • 49
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    Chromatographie von Carbamat- und Phenylharnstoff-Pesticiden auf Dünnschichten von basischem Zinkcarbonat (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 275 (1975), S. 201-202 
    Details
    ISSN: 1618-2650
    Keywords: Trenn. von Pesticiden, Carbamaten, Phenylharnstoffen ; Chromatographie, Dünnschicht ; Schicht aus basischem Zinkcarbonat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Dünnschichten von basischem Zinkcarbonat eignen sich zur Trennung und multiplen Identifizierung von Herbiciden und Insecticiden aus den Wirkstoffgruppen der Carbamate und Phenylharnstoffderivate. Fünf Wirkstoffe, die für die Praxis große Bedeutung haben, konnten mit Hilfe der eindimensionalen Dünnschicht-Chromatographie getrennt werden. Die beste Trennung erhielten wir mit folgenden Laufmitteln: a) Benzol, b) einer Mischung aus Benzol/Petroläther/Chloroform (6∶1∶1). Die Substanzen sind entweder im kurzwelligen UV-Licht bei Indicatorzusatz, oder nach dem Sprühen mit einer 0,1 N AgNO3-Lösung in 3 N HNO3 und anschließender UV(254)-Bestrahlung zu erkennen.
    Notes: Abstract Thin layers of basic zinc carbonate can be used with good results for separation and multiple identification of carbamate and phenylurea pesticides. Five important substances could be separated by one-dimension TLC. The best results were obtained by the following developing solvents: a) benzene, b) a mixture of benzene/petroleum ether/chloroform (6∶1∶1). The substances are either recognisable in short-wave UV-light, when a fluorescence indicator (F 254 nm) is added, or in day-light, after spraying a solution of 0.1 N AgNO3 in 3 N HNO3, followed by an UV-exposure for about 4 min.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00488065
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    Dünnschicht-chromatographische Nachweisgrenzen (semiquantitative Bestimmung) von toxischen Metallionen (Blei, Cadmium, Quecksilber, Zink) (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 275 (1975), S. 206-206 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Blei, Cadmium, Quecksilber, Zink ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00488071
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  • 51
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    Einfluß verschiedener Polyamid-Chargen auf die dünnschicht-chromatographische Trennung von Carbamat- und Phenylharnstoff-Pesticiden (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 276 (1975), S. 301-302 
    Details
    ISSN: 1618-2650
    Keywords: Trenn. von Pesticiden, Carbamaten, Phenylharnstoffen ; Chromatographie, Dünnschicht ; Schichten aus verschiedenen Polyamid-Chargen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00430993
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  • 52
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    TLC separation of closely related amines (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 276 (1975), S. 382-382 
    Details
    ISSN: 1618-2650
    Keywords: Trenn. von Aminen ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00429500
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