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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 2 (1970), S. 150-154 
    ISSN: 1432-1041
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Zusammenfassung Das Sulfonamid Sulfaphenazol verstärkt den hypoglykamisierenden Effekt von Tulbutamid über eine Verlängerung der Serumhalbwertzeit für Tolbutamid. Es wird untersucht, an welcher Stelle des Abbauweges Sulfaphenazol die Metabolisierung von Tolbutamid im menschlichen Organismus hemmt. Da Sulfaphenazol nur die Serumhalbwertzeit des noch nicht metabolisierten Tolbutamid signifikant verlängert, nicht jedoch die Serumhalbwertzeit seiner Metaboliten Hydroxyl-Tolbutamid und Carboxyl-Tolbutamid, muß angenommen werden, daß Sulfaphenazol den ersten Abbauschritt von Tolbutamid, d.h. die Hydroxylierung, verzögert, während der nächste Abbauschritt, die Carboxylierung, ungehindert in wenigen Minuten abläuft.
    Notes: Summary Sulfaphenazol potentiates the hypoglycaemic effect of tolbutamide by prolonging its half-life in plasma. The attempt has been made in man to localize the step in tolbutamide metabolism which is inhibited by sulfaphenazol. It was found to prolong the half-life of undegraded tolbutamide without interfering with the elimination of its metabolites hydroxy-tolbutamide and carboxy-tolbutamide. It seems that sulfaphenazol blocks the first stage of tolbutamide metabolism, its hydroxylation, whilst the second step — carboxylation — remains uninhibited and is accomplished in a few minutes.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 4 (1971), S. 32-37 
    ISSN: 1432-1041
    Keywords: Glibenclamide ; pharmacokinetics ; metabolism ; potentiation of hypoglycemic action ; phenylbutazone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Summary Metabolically healthy subjects were given an intravenous injection of 1,13 mg14C-labelled glibenclamide (HB 419). The plasma level, renal elimination of the radioactivity and metabolism of the substance were investigated. Two minutes after administration the HB 419 is virtually present only in the blood and at the end of the distribution period mostly in the extracellular space. 53% of the radioactivity is excreted via the kidneys in the form of metabolites. If glibenclamide is administrated in the same way to the same subjects after pretreatment with phenylbutazone there are no differences in the course of the plasma levels or the rate of elimination from the blood. There is, however, a significant difference in the excretion of the radioactivity in the urine. In the presence of phenylbutazone significantly less HB 419 metabolite is excreted renally. In view of the known alternative route of elimination it is suggested that the amount not excreted in the urine is in compensation eliminated via the bile. There was no difference in the metabolism of glibenclamide between the control and phenylbutazone treated groups. The potentiation by phenylbutazone of HB 419 action, and probably also that of other antidiabetic sulphonylureas, must therefore be due predominantly to other causes (Communication III).
    Notes: Zusammenfassung Stoffwechselgesunde Versuchspersonen erhielten14C-markiertes Glibenclamid in einer Dosis von 1.13 mg/Vpn i.v. gespritzt. Plasmaspiegelverläufe, renale Elimination der Radioaktivität und die Metabolisierung der Substanz wurden untersucht. Zwei Minuten nach der Applikation ist HB 419 praktisch nur im Blutund nach Abschluß der Verteilung weitgehend im Extracellulärraum vorhanden. 53% der Radioaktivität werden über die Nieren in Form von Metaboliten ausgeschieden. Wird den gleichen Probanden nach Prämedikation mit Phenylbutazon Glibenclamid in gleicher Weise verabfolgt, ergibt sich kein Unterschied hinsichtlich der Plasmaspiegelverläufe und der Eliminationsgeschwindigkeit aus dem Blut. Ein signifikanter Unterschied besteht jedoch in der Ausscheidung der Radioaktivität in den Harn (26.3%). In Gegenwart von Phenylbutazon wird ein signifikant geringerer Anteil von HB 419-Metaboliten renal eliminiert. Aufgrund des bekannten zweiten Ausscheidungsweges wird vermutet, daß der fehlende Anteil kompensatorisch über die Galle eliminiert wird. Die Metabolisierung von Glibenclamid weist keine Differenzen zwischen Phenylbutazon-und Kontroll-Gruppe auf. Die Wirkungspotenzierung von HB 419 — wahrscheinlich auch diejenige anderer antidiabetisch wirksamer Sulfonylharnstoffe — durch Phenylbutazon dürfte demnach überweigend andere Ursachen haben. (Mitteilung III).
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  • 3
    Publication Date: 1971-12-01
    Print ISSN: 0031-6970
    Electronic ISSN: 1432-1041
    Topics: Chemistry and Pharmacology , Medicine
    Published by Springer
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  • 4
    Publication Date: 1970-06-01
    Print ISSN: 0031-6970
    Electronic ISSN: 1432-1041
    Topics: Chemistry and Pharmacology , Medicine
    Published by Springer
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  • 5
    Publication Date: 2019-07-13
    Description: Propellant flame temperature and emission spectra during depressurization by rarefaction waves, using rapid scanning spectrometer
    Keywords: PROPELLANTS
    Type: AIAA PAPER 70-663 , AMERICAN INST. OF AERONAUTICS AND ASTRONAUTICS, PROPULSION JOINT SPECIALIST CONFERENCE, 6TH; Jun 15, 1970 - Jun 19, 1970; SAN DIEGO, CA
    Format: text
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  • 6
    Publication Date: 2019-07-13
    Description: Composite propellant flame temperature and emission spectra during depressurization by rarefaction waves, using rapid scanning spectrometer
    Keywords: PROPELLANTS
    Type: AIAA PAPER 70-663 , ; TROPHYSICAL JOURNAL|PROPULSION JOINT SPECIALIST CONFERENCE; Jun 15, 1970 - Jun 19, 1970; SAN DIEGO, CA
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