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Flavonoids from the Pericarps of Litchi chinensis

文献类型: 外文期刊

作者: Ma, Qing 2 ; Xie, Haihui 2 ; Li, Sha 1 ; Zhang, Ruifen 1 ; Zhang, Mingwei 1 ; Wei, Xiaoyi 2 ;

作者机构: 1.Guangdong Acad Agr Sci, Sericulture & Agrifood Res Inst, Guangzhou 510610, Guangdong, Peoples R China

2.Chinese Acad Sci, South China Bot Garden, Key Lab Plant Resources Conservat & Sustainable U, Guangzhou 510650, Guangdong, Peoples R China

3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

关键词: Litchi chinensis;pericarp;flavonoids;bis(8-epicatechinyl)methane;dehydrodiepicatechin A;antioxidant activity

期刊名称:JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY ( 影响因子:5.279; 五年影响因子:5.269 )

ISSN:

年卷期:

页码:

收录情况: SCI

摘要: A new methylene-linked flavan-3-ol dimer, bis(8-epicatechinyl)methane (1), was isolated from the pericarps of Litchi chinensis Sonn. (Sapindaceae), together with dehydrodiepicatechin A (2), proanthocyanidin A1 (3), proanthocyanidin A2 (4), (—)-epicatechin (5), 8-(2-pyrrolidinone-5-yl)-(—)-epicatechin (6), (—)-epicatechin 8-C-β-D-glucopyranoside (7), naringenin 7-O-(2,6-di-O-α-L-rhamnopyranosyl)-β-D-glucopyranoside (8), and rutin (9). It was the first report of compound 2 as a natural product and compounds 6—8 from this species. Compounds 1, 2, and 6—8 were evaluated for antioxidant activity. The ferric reducing antioxidant powers (FRAP) of compounds 1 and 6 were comparable to that of L-ascorbic acid, and the scavenging activities of compounds 1, 2, 6, and 7 toward 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals and 2,2'-azinobis(3-ethylbenzthiazoline-6-sulfonic acid) radical cations were more potent than those of L-ascorbic acid; compound 8 was weak in FRAP and DPPH assays.

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