Title: Theaflavate B, ISOTHEAFLAVIN-3′-O-GALLATE and NEOTHEAFLAVIN-3-O-GALLATE: three polyphenolic pigments from black tea
Abstract: Three new polyphenolic compounds, theaflavate B, isotheaflavin-3'-O-gallate and neotheaflavin-3- O-gallate, have been characterised in extracts from black tea (the fermented leaves of Camellia sinensis). The structures of these compounds were determined using 1D and 2D NMR spectroscopy, mass spectrometry and chemical oxidation of catechin precursors. Theaflavate B contains a benzotropolone moiety produced from oxidation of the galloyl ester group of a flavan-3-O-gallate and as such represents a new class of polyphenol pigments obtained from black tea. 1998 Elsevier Science Ltd. All rights reserved.
Publication Year: 1998
Publication Date: 1998-12-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 59
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