# WILBERT

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• 1
Electronic Resource
Springer
Chromatographia 28 (1989), S. 375-378
ISSN: 1612-1112
Keywords: Column liquid chromatography ; Fluorimetric detection ; Adriamycin ; Adriamycinol ; Human plasma
Source: Springer Online Journal Archives 1860-2000
Topics: Chemistry and Pharmacology
Notes: Summary A simple and very sensitive HPLC method, for the simultaneous determination in human plasma of adriamycin and its metabolite adriamycinol, is described. Plasmas from patients were stored frozen. Thawed samples were extracted by absorption of anthracyclin onto a small C18 column. After evaporation of the eluate and reconstitution of the residue with methanol (100μL), 30 to 40μL of the mixture were injected into the chromatograph. Separation was obtained using an RP 8 column with a mobile phase of formate buffermethanol-acetonitrile (50∶23∶27, v/v). A spectrofluorimeter was used as detector. The limit of sensitivity of the assay was 50 pcg/ml of plasma.
Type of Medium: Electronic Resource
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• 2
Electronic Resource
Springer
Chromatographia 35 (1993), S. 435-438
ISSN: 1612-1112
Keywords: Column liquid chromatography ; Pirarubicin and metabolites ; Anthracyclines
Source: Springer Online Journal Archives 1860-2000
Topics: Chemistry and Pharmacology
Notes: Summary A new and highly sensitive HPLC method for the simultaneous determination of pirarubicine (THP-doxorubicin) and its metabolites, adriamycin and adriamycinol, in human plasma, is described. Samples were treated by liquid-liquid extraction, the organic phase removed and the residue dissolved in methanol. Separation was on a Lichrocart Supersher RP 8 column, (250×4 mm) 4 μm, with a mobile phase of acetonitrile/methanol/formate-buffer.
Type of Medium: Electronic Resource
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• 3
Electronic Resource
Springer
Cancer chemotherapy and pharmacology 36 (1995), S. 239-243
ISSN: 1432-0843
Keywords: Pirarubicin ; Pharmacokinetics ; Pharmacodynamics ; Anthracyclines ; THP-Adriamycin
Source: Springer Online Journal Archives 1860-2000
Topics: Medicine
Notes: Abstract The pharmacokinetic monitoring of anthracycline-containing regimens is warranted because of the important toxicity of these drugs and because pharmacokinetic-pharmacodynamic relationships have been clearly established. We studied the pharmacokinetics of the new anthracycline pirarubicin in 80 courses of treatment performed in 27 patients, using a limited sampling protocol we had previously validated. We observed (for 47 of these courses) a significant correlation between the leucocyte cell kill and the pirarubicin area under the timexconcentration curve, but the most significant correlation was obtained using the plasma concentration of doxorubicin, a metabolite of pirarubicin, at the end of the infusion. On the basis of this value, it is possible to predict for pirarubicin haematological toxicity in a way that can help the clinician in identifying patients at risk for toxicity.
Type of Medium: Electronic Resource
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• 4
Electronic Resource
Springer
Cancer chemotherapy and pharmacology 36 (1995), S. 233-238
ISSN: 1432-0843
Keywords: Pirarubicin ; Limited sampling strategy ; Pharmacokinetics ; Maximum-likelihood estimation ; Bayesian estimation
Source: Springer Online Journal Archives 1860-2000
Topics: Medicine
Notes: Abstract Pirarubicin (4′-O-tetrahydropyranyldoxorubicin, THP-Adriamycin) is a new anthracycline antibiotic that has recently been developed because its reduced cardiac toxicity is associated with an antitumour efficacy similar to that of doxorubicin. Pirarubicin is characterised by strong haematological toxicity, which has been shown to be correlated with pharmacokinetic parameters, especially the area under the time-concentration curve. To obtain routine pharmacokinetic evaluations of pirarubicin for dose monitoring we developed a limited sampling strategy relying on three blood samples taken at the end of the infusion and at 12 and 24 h post-infusion. The characteristics of interindividual variability were assessed on the first courses of treatment performed in 18 patients; the model was then validated on 10 independent first courses of treatment performed in 10 other patients. The main pharmacokinetic parameters (half-lives, total volume of distribution, total plasma clearance) were estimated in the test group by maximum-likelihood estimation using all samples and by Bayesian estimation using three samples. The concordance between the two estimates was correct (the bias and precision for clearance were 2.3% and 12.1%, respectively), which shows that this limited sampling strategy can be used in routine drug monitoring.
Type of Medium: Electronic Resource
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• 5
Electronic Resource
Springer
Cancer chemotherapy and pharmacology 36 (1995), S. 239-243
ISSN: 1432-0843
Keywords: Key words Pirarubicin ; Pharmacokinetics ; Pharmacodynamics ; Anthracyclines ; THP-Adriamycin
Source: Springer Online Journal Archives 1860-2000
Topics: Medicine
Notes: Abstract  The pharmacokinetic monitoring of anthracycline-containing regimens is warranted because of the important toxicity of these drugs and because pharmacokinetic-pharmacodynamic relationships have been clearly established. We studied the pharmacokinetics of the new anthracycline pirarubicin in 80 courses of treatment performed in 27 patients, using a limited sampling protocol we had previously validated. We observed (for 47 of these courses) a significant correlation between the leucocyte cell kill and the pirarubicin area under the time × concentration curve, but the most significant correlation was obtained using the plasma concentration of doxorubicin, a metabolite of pirarubicin, at the end of the infusion. On the basis of this value, it is possible to predict for pirarubicin haematological toxicity in a way that can help the clinician in identifying patients at risk for toxicity.
Type of Medium: Electronic Resource
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• 6
Electronic Resource
Springer
Cancer chemotherapy and pharmacology 36 (1995), S. 233-238
ISSN: 1432-0843
Keywords: Key words Pirarubicin ; Limited sampling strategy ; Pharmacokinetics ; Maximum-likelihood estimation ; Bayesian estimation
Source: Springer Online Journal Archives 1860-2000
Topics: Medicine
Notes: Abstract  Pirarubicin (4′-O-tetrahydropyranyldoxoru-bicin, THP-Adriamycin) is a new anthracycline antibiotic that has recently been developed because its reduced cardiac toxicity is associated with an antitumour efficacy similar to that of doxorubicin. Pirarubicin is characterised by strong haematological toxicity, which has been shown to be correlated with pharmacokinetic parameters, especially the area under the time-concentration curve. To obtain routine pharmacokinetic evaluations of pirarubicin for dose monitoring we developed a limited sampling strategy relying on three blood samples taken at the end of the infusion and at 12 and 24 h post-infusion. The characteristics of interindividual variability were assessed on the first courses of treatment performed in 18 patients; the model was then validated on 10 independent first courses of treatment performed in 10 other patients. The main pharmacokinetic parameters (half-lives, total volume of distribution, total plasma clearance) were estimated in the test group by maximum-likelihood estimation using all samples and by Bayesian estimation using three samples. The concordance between the two estimates was correct (the bias and precision for clearance were 2.3% and 12.1%, respectively), which shows that this limited sampling strategy can be used in routine drug monitoring.
Type of Medium: Electronic Resource
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• 7
Electronic Resource
Springer
Pharmaceutical research 2 (1985), S. 87-90
ISSN: 1573-904X
Source: Springer Online Journal Archives 1860-2000
Topics: Chemistry and Pharmacology
Notes: Abstract The effects of isosorbide dinitrate (ISDN) and its 2- and 5-mononitrate metabolites (2-ISMN and 5-ISMN) against platelet aggregation and thromboxane release were investigated by analysis of platelet aggregation curves. ISDN, 2-ISMN and 5-ISMN (isosorbide nitrates, ISN) inhibited both ADP- and epinephrine (EPI)-induced platelet aggregation. ISN affected specifically the extent of ADP-induced aggregation and the velocity of EPI-induced effects. 2-ISMN was more potent against platelet aggregation compared to ISDN and 5-ISMN. The isosorbide nitrates were poor inhibitors of both arachidonic acid-induced aggregation and platelet TxB2 release. The differential inhibition by the three isosorbide nitrates of endogenous TxB2 release during ADP-induced aggregation further indicates that 2-ISMN is a significantly more potent platelet inhibitor than either ISDN or 5-ISMN. These studies suggest a role of the metabolites in modulating the pharmacological effects of ISDN on platelet activity.
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• 8
Electronic Resource
Springer
ISSN: 1741-0444
Keywords: Gnathology ; Occlusal sounds ; Sound locatisation ; Waveform analyser
Source: Springer Online Journal Archives 1860-2000
Topics: Biology , Chemistry and Pharmacology , Medicine
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• 9
Electronic Resource
Springer
Annals of vascular surgery 11 (1997), S. 637-639
ISSN: 1615-5947
Source: Springer Online Journal Archives 1860-2000
Topics: Medicine
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• 10
Electronic Resource
Springer
Polymer bulletin 16 (1986), S. 537-543
ISSN: 1436-2449
Source: Springer Online Journal Archives 1860-2000
Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
Notes: Summary A viscosimetric method was used to investigate the intramolecular association in diluted aqueous solution of two polyacrylamides. The concentration at which only intramolecular association take place were obtained from temperature effect on [η]. Addition of kalium iodide, a hydrogen bond breaker, increased [η]. As salt concentration was higher [η] became greater, proving that some part of intramolecular hydrogen bonds was broken. The values of [η] in 1 N salt solutions were in the order: $${\text{HPO}}_{\text{4}}^{{\text{2 - }}} 〈 {\text{H}}_{\text{2}} {\text{O}} 〈 {\text{ Br}}^{\text{ - }} 〈 {\text{NO}}_{\text{3}}^{\text{ - }} 〈 {\text{I}}^{\text{ - }} = {\text{BrO}}_{\text{3}}^{\text{ - }} 〈 {\text{ClO}}_{\text{3}}^{\text{ - }} = {\text{SCN}}^{\text{ - }}$$ . The dependence of the reduced viscosity at a constant concentration of 0.05 % polyacrylamide for the above mentioned salts, as well as for isopropyl alcohol, isobutyl alcohol, glycerine, urea, hydroxylamine hydrochloride, sodium acetate and sodium carbonate on additive concentration has been determined. The slopes of these diagrams were positive for hydrogen bond breakers and negative for hydrogen bond makers, showing that the first increased the macromolecular coil dimensions, whereas the last decreased them.
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