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Isolation and identification of (—)‐gallocatechin gallate and circular dichroism of green tea flavanols
Author(s) -
Wilkins C. K.,
de Bruijn J.,
Korver O.,
Frost D. J.,
Weinges K.
Publication year - 1971
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740220913
Subject(s) - circular dichroism , chemistry , chromatography , gallate , column chromatography , stereochemistry , nuclear chemistry
Partly raceme (—)‐gallocatechin gallate was isolated from green tea by counter‐current distributins and column chromatography on Sephadex LH‐20. The structure was proven by mass spectroscopy of the pertrimethylsilyl ether and by n.m.r. and circular dichroism (c.d.). The compound is probably an artifact produced by heating (—)‐epigallocatechin gallate. Circular dichroism curves of several tea flavanols are presented.