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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 52 (1980), S. 729-733 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 42 (1970), S. 729-737 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 46 (1974), S. 647-650 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 40 (1968), S. 402-418 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 42 (1970), S. 284-304 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 56 (1968), S. 1049-1058 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Zur Spurenbestimmung von acht Metallionen, die als Hemmstoffe der Ureasewirkung auf die Harnstoffhydrolyse wirken, wurde eine kinetische Methode mit Hilfe eines pH-Staten ausgearbeitet. Die kinetischen Parameterv M undK m für das Ureasesystem und die HemmungskonstantenK 0′ für die Einwirkung der Metallionen wurden gemessen. Nach absteigendenK 0′-Werten ergab sich folgende Empfindlichkeitsreihe: Ag(I) 〉 Hg(II) 〉 Cu(II) 〉 〉 Cd(II) 〉 Mn(II) ∼Co(II) 〉 Pb(II) 〉 Ni(II). Ag(I) wurde in der Größenordnung 2–10 · 10−8 Mol mit einem maximalen Fehler von rel. 11,6% bestimmt, was einem absoluten Fehler von 0,5 ng entspricht. Die Genauigkeit der Einzelbestimmungen betrug ±2% rel. Die Ergebnisse zeigen eindeutig die Anwendbarkeit der Fermenthemmung für die Analyse von Metallspuren.
    Notes: Summary A pH-stat, kinetic method, based on the decreased rate of the ureasecatalyzed hydrolysis of urea, was developed for the trace determination of eight metal ion inhibitors. The kinetic parameters,v M andK m for the urease system and the apparent inhibition constants,K 0′, for the metal ion interactions were measured. The sensitivities of the metal ions in decreasing order ofK 0′ are: Ag(I) 〉 Hg(II) 〉 Cu(II) 〉 Cd(II)〉 〉 Mn(II) ∼Co(II) 〉 Pb(II) 〉 Ni(II). Ag(I) was determined in the range of 2–10 · 10−8 M with a maximum error of 11.6% relative which corresponds to an absolute error of 0.5 ng. The precision of individual determinations was ±2% relative. Results clearly indicate the adaptability of enzymatic inhibition to trace metal ion analyses.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 56 (1968), S. 538-545 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Über die Hemmung der Glukose-Oxydase durch die Schwermetalle Ag(I), Hg(II) und Pb(II) wurde berichtet. Die Mikrobestimmung dieser Metalle läßt sich auf der Basis der Verminderung der enzymatisehen aeroben Oxydation der Glukose zu Glukonsäure und Wasserstoffperoxid durchführen. In Gegenwart von Meerrettich-Peroxydase läßt sich die rasche Oxydation von o-Dianisidin durch Wasserstoffperoxid spektrophotometrisch bei 440 nm verfolgen. Ag(I) wurde in der Größenordnung von 0,005 bis 0,2,μg/ml mit einem absoluten Fehler von weniger als 14 ng bestimmt, Hg(II) in der Größenordnung von 0,1 bis 0,4,μg/ml mit einem maximalen Fehler von 34 ng. Unterhalb 260μg/ml zeigt Pb(II) keine nennenswerte Hemmung. Die Ergebnisse zeigen die Eignung enzymatischer Methoden für die Spurenanalyse von Metallion-Inhibitoren.
    Notes: Summary The inhibition of the glucose oxidase enzyme by three heavy metal inhibitors, Ag(I), Hg(II), and Pb(II) is reported. The method for the microdetermination of these metals is based on the decreased rate of the enzyme-catalyzed, aerobic oxidation of glucose to gluconic acid and hydrogen peroxide. In the presence of horseradish peroxidase, the rapid oxidation ofo-dianisidine by hydrogen peroxide can be followed spectrophotometrically at 440 nm. Silver(I) has been determined in the range of 0.005 to 0.2μg/ml with an absolute error of less than 14 ng. Mercury(II) has been determined in the range of 0.1 to 0.4μg/ml with a maximum error of 34 ng. Below a concentration of 260μg/ml Pb(II), no appreciable inhibition was observed. Results indicate the utility of enzymatic methods to the trace determination of metal ion inhibitors.
    Type of Medium: Electronic Resource
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