Biphenyl-linked biflavanoids from grape pomace

被引：18

作者：

Foo, LY ^{[1
]}

Lu, YR ^{[1
]}

Wong, H ^{[1
]}

机构：

[1] Ind Res Ltd, Lower Hutt, New Zealand

来源：

PHYTOCHEMISTRY | 1998年 / 47卷 / 06期

关键词：

Vitis vinifera; Vitaceae; grape pomace; oxidative coupling; biphenyl linkage; biflavanoids;

D O I：

10.1016/S0031-9422(97)00525-6

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Two novel biphenyl linked biflavanoids commonly associated with polyphenol oxidase-coupled products were isolated from Chardonnay grape pomace. Their chemical structures were established by long-range H,C couplings as epicatechin [6' --> 8]-epicatechin and epicatechin [6' --> 8] catechin. The disproportionate representation of the epicatechin unit as compared with catechin among the isolated biflavanoids could not be accounted for by their relative concentration in the pomace and suggested that the 2,3-trans configuration provided more steric constraints than the 2,3-cis one during grape polyphenol enzymatic oxidation of the B-ring leading to the quinone intermediate. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：1137 / 1140

页数：4

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