The reactivity of 18-molybdodiphosphate heteropoly complex (18-MPC) with respect to the polyphenolic compounds contained in green teas was estimated. The one-and two-electron heteropoly blues coexist depending on the ratio of reducing agent to 18-MPC in such reactions. The results for the determination of total content of polyphenols in green teas of different brands obtained with 18-MPC and Folin-Ciocalteu reagent are close to each other. The disadvantages of the existing methods are shown.
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