Elsevier

Phytochemistry

Volume 8, Issue 8, August 1969, Pages 1553-1558
Phytochemistry

Identification of three flavan-3-ols from grapes

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Abstract

Three phenolic substances present in sizable amount in grapes, particularly in underripe grape seeds, are relatively easily extracted into ether and were isolated and unequivocally identifed as (+)-catechin, (+)-(2R:3S)-5,7,3′,4′-tetrahydroxyflavan-3-ol; (−)-epicatechin, (−)-(2R:3R)-5,7,3′,4′-tetrahydroxyflavan-3-ol; and (−)-epicatechin-3-gallate. These identifications clear up previous conflicting and incomplete reports and show that the grapevine synthesizes the catechin isomers to be expected from work with other plants.

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