Chemical constituents with antioxidant activities from litchi (Litchi chinensis Sonn.) seeds

文献类型： 外文期刊

第一作者： Wang, Lijun

作者： Wang, Lijun;Lou, Guodong;Ma, Zhongjun;Liu, Xueming

作者机构：

关键词： litchi chinensis seeds;flavan dimer;antioxidant activities

期刊名称：FOOD CHEMISTRY （ 影响因子：7.514； 五年影响因子：7.516 ）

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收录情况： SCI

摘要： Litchi (Litchi chinensis Sonn.) is widely accepted as a delicious fruit in China and its seeds have been commonly used in traditional Chinese medicine to relieve neuralgic pain. In the present study, chemical investigation of the 95% ethanol extract of Litchi chinensis seeds led to the isolation of four new compounds, 2x,3x-epoxy-5,7,3',4'-tetrahydroxyflavan-(4p-8-catechin) (5), 2p,3p-epoxy-5,7,3',4'-tetra-hydroxyflavan-(4x-8-epicatechin) (7), litchiol A (9) and litchiol B (12), together with 11 known ones, 2,5-dihydroxy-hexanoic acid (1), soscopoletin (2), coumaric acid (3), protocatechuic acid (4), 2x,3x-epoxy-5,7,3',4'-tetrahydroxyflavan-(4p-8)-epicatechin (6), pterodontriol D-6-O-β-D-glucopyranoside (8), Narirutin (10), naringin (11), dihydrocharcone-4'-0-p-D-glucopyranoside (13), pinocembrin-7-ruti-noside (14), pinocembrin-7-neohesperidoside (15). Their structures were mainly elucidated on the basis of NMR, MS, IR, CD and UV spectral evidences. Antioxidant activities of 14 compounds were determined by DPPH radical-scavenging assay and Trolox equivalent antioxidant capacity assay, and the results showed that four compounds, protocatechuic acid (4), 2x,3x-epoxy-5,7,3',4'-tetrahydroxyflavan-(4β-8-catechin (5), 2x,3x-epoxy-5,7,3',4'-tetrahydroxyflavan-(4β-8)-epicatechin (6), 2β,3β-epoxy-5,7,3',4'-tet-rahydroxyflavan-(4x-8)-epicatechin (7), exhibited moderate antioxidant activities.

分类号： TS2

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