Incidence of molecular structure in oxidation of grape seed procyanidins

被引:60
作者
de Freitas, VAP
Glories, Y
Laguerre, M
机构
[1] Univ Porto, Fac Ciencias, Dept Quim, P-4150 Oporto, Portugal
[2] Univ Bordeaux 2, Inst Oenol, F-33405 Talence, France
[3] Univ Bordeaux 1, CRPP, CNRS, UPR 8641, F-33600 Pessac, France
关键词
grape seeds; procyanidins; identification; oxidation; molecular mechanics;
D O I
10.1021/jf970468u
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
The kinetics of decomposition of the following flavan-3-ol derivatives isolated from grape seeds under oxidative conditions by airing and using metal ion catalysis (iran and copper) are determined: if)catechin and (-)-epicatechin; seven natural procyanidin dimers, B1 [(-)-epicatechin-(4-->8)-(+)-catechin], B2 [(-)-epicatechin-(4-->8)-(-)-epicatechin], B3 [(+)-catechin-(4-->8)-(+)-catechin], B4 [(+)-catechin-(4-->8)-(-)-epicatechin], B6 [(+)-catechin-(4-->6)-(+)-catechin], B7 [(-)-epicatechin-(4-->6)-(+)-catechin], and B8 [(-)-epicatechin-(4-->6)-(-)-epicatechin]; trimers, C1 [(-)-epicatechin-(4-->8)-(-)-epicatechin-(4-->8)-(-)-epicatechin], (+)-catechin-(4-->8)-(+)-catechin-(4-->8)-(-)-epicatechin, and (+)-catechin-(4-->8)-(-)-epicatechin-(4-->6)-(+)-catechin, monogallate esters of B2 and B4 and digallate of B2, which were isolated from grape seeds. Kinetic decomposition comparisons were monitored by HPLC. The following order was found for oxidative decomposition for procyanidin dimers: B3 approximate to B4 > B7 approximate to B6 > B1 approximate to B2 > B8. In the conditions of this study, the gallate ester of (-)-epicatechin is more unstable than (-)-epicatechin; inversely, kinetic decompositions of dimeric procyanidins B2 and B4 are much more important than those of their gallate esters. Molecular mechanics (MM2*) and H-1 NMR studies of dimeric 3-O-gallate structures show a pi-pi stacking arrangement between the aromatic gallate and catechol rings, absent in analogous dimeric procyanidins, which reduces the total surface accessible to oxidizing agents.
引用
收藏
页码:376 / 382
页数:7
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