Theadibenzotropolone A, a New Type Pigment from Enzymatic Oxidation of (-)-Epicatechin and (-)-Epigallocatechin Gallate and Characterized from Black Tea Using LC/MS/MS.

A New Type of Tea Pigment—From the Chemi

A New Type of Tea Pigment—From the Chemical Oxidation of Epicatechin Gallate and Isolated from Tea

✍ Wan, Xiaochun; Nursten, Harry E; Cai, Ya; Davis, Adrienne L; Wilkins, John P G; 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 326 KB

Epicatechin-3-O-gallate (ECG), one of the major green tea polyphenols, was oxidised chemically using potassium ferricyanide. The major oxidation product, termed theaÑavate A, which gave a sharp peak on HPLC analysis, was separated and puriÐed by a combination of chromatography on Sephadex LH-20 and