ESTIMATION OF ANTTOXIDATIVE PROPERTIES OF TEA LEAVES BY ABRASIVE STRIPPING ELECTROCHEMISTRY USING PARAFFIN-IMPREGNATED GRAPHITE ELECTRODE

摘要

Electrooxidation potentials of powdered green and black teas were determined by abrasive stripping voltammetry. A circular surface of paraffin-impregnated graphite rod was contaminated with tea microparticles and used as a chemically prepared working electrode in square-wave voltammetric experiments. The responses are ascribed to electrooxidation of flavanols in teas. Low oxidation potentials of some green teas were observed. An advantage of the proposed method is that no extraction of electroactive components is necessary. [PUBLICATION ABSTRACT]