Enzymatic determination of cadmium, zinc, and lead in plant materialsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Авторы:
Muginova S.V. ,
Veselova I.A. ,
Parova L.M. ,
Shekhovtsova T.N.
Журнал:
Journal of Analytical Chemistry
Том:
63
Номер:
10
Год издания:
2008
Издательство:
Maik Nauka/Interperiodica Publishing
Местоположение издательства:
Russian Federation
Первая страница:
1005
Последняя страница:
1014
DOI:
10.1134/S1061934808100146
Аннотация:
Prospects are outlined for using the following enzymes (native and immobilized on polyurethane foam) in the rapid and highly sensitive determination of cadmium, zinc, and lead ions in plant materials (wild grass, fresh pea, and grape): horseradish peroxidase and alkaline phosphatases isolated from chicken intestine and Greenland seal small intestine. The analytical ranges of the above metals are 1 × 10-3-25, 7 × 10 -3-250, and 3 × 10-2-67 mg/kg dry matter, respectively. The enzymatic determination procedures developed are based on the inhibiting effect of metal ions on the catalytic activity of peroxidase in the oxidation of o-dianisidine with hydrogen peroxide and alkaline phosphatases in the hydrolysis of p-nitrophenyl phosphate. The rates of enzymatic reactions were monitored spectrophotometrically or visually. In the analysis of plant extracts, their high acidity was diminished by choosing optimum dilution factors and pH values for test samples and the nature and concentration of a buffer solution. The interference of iron(III) was removed by introducing a 0.1 M tartaric acid solution into the indicator reaction. The accuracy of the results of the enzymatic determination of cadmium, zinc, and lead in plant materials was supported by atomic absorption spectrometry and anodic stripping voltammetry. © 2008 MAIK Nauka.
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