Chemical constituents with antioxidant activities from litchi (Litchi chinensis Sonn.) seeds
文献类型： 外文期刊
作者： Wang, Lijun 1 ; Lou, Guodong 1 ; Ma, Zhongjun 1 ; Liu, Xueming 2 ;
作者机构： 1.Zhejiang Univ, Sch Pharmaceut Sci, Hangzhou 310058, Zhejiang, Peoples R China
2.Guangdong Acad Agr Sci, Sericulture & Farm Produce Proc Res Inst, Guangzhou 510610, Guangdong, Peoples R China
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 ）
ISSN：
年卷期：
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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.
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