Kazan (Volga region) Federal University, KFU
KAZAN
FEDERAL UNIVERSITY
 
CHRONOAMPEROMETRIC EVALUATION OF THE ANTIOXIDANT CAPACITY OF TEA ON A POLYQUERCETIN-MODIFIED ELECTRODE
Form of presentationArticles in international journals and collections
Year of publication2017
Языканглийский
  • Budnikov German Konstantinovich, author
  • Ziyatdinova Guzel Kamilevna, author
  • Guss Ekaterina Valerevna, postgraduate kfu
  • Bibliographic description in the original language Ziyatdinova G.K. Chronoamperometric evaluation of the antioxidant capacity of tea on a polyquercetin-modified electrode / G.K. Ziyatdinova, E.V. Kozlova, H.C. Budnikov // J. Anal. Chem. - 2017. - V. 72. - № 4. - P. 382-389.
    Annotation It was established that the components of tea are oxidized on a glassy carbon electrode modified with carbon nanotubes and electropolymerized quercetin in a phosphate buffer solution (pH 7.0) as a supporting electrolyte under conditions of differential pulse voltammetry. The oxidation potentials of the individual phenolic antioxidants of tea (gallic acid, rutin, quercetin, catechin, epigallocatechin gallate, and tannin) on the modified electrode were found. A method for the chronoamperometric determination of the antioxidant capacity (AOC) of tea was developed based on the oxidation of tea antioxidants at a potential of 0.20 V. The AOC of tea was evaluated using а difference between the oxidation currents of the analyte and a supporting electrolyte after 50 s of electrolysis in terms of gallic acid. The analytical range of gallic acid was 0.25‒750 μM with a detection limit of 0.063 μM.
    Keywords Сhronoamperometry, chemically modified electrodes, electropolymerized materials, antioxidant capacity, food analysis
    The name of the journal JOURNAL OF ANALYTICAL CHEMISTRY
    URL https://www.scopus.com/inward/record.uri?eid=2-s2.0-85018463449&doi=10.1134%2fS1061934817040189&partnerID=40&md5=8b0bbd7970ddd2ba535e88cb060699f6
    Please use this ID to quote from or refer to the card https://repository.kpfu.ru/eng/?p_id=157850&p_lang=2

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