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標題: Structural determination and DPPH radical-scavenging activity of two acylated flavonoid tetraglycosides in oolong tea (Camellia sinensis)
作者: 曾志正
Lee, V.S.Y.
Chen, C.R.
Liao, Y.W.
Tzen, J.T.C.
Chang, C.I.
關鍵字: Camellia sinensis;oolong tea;quercetin;kaempferol;1,1-diphenyl-2-pierylhydrazyl;green tea;phenolic-compounds;glycosides;tannins;identification;flavan-3-ols;constituents;elucidation;catechins;fruits
Project: Chemical & Pharmaceutical Bulletin
期刊/報告no:: Chemical & Pharmaceutical Bulletin, Volume 56, Issue 6, Page(s) 851-853.
Two major acylated flavonoid tetraglycosides were isolated from the methanol extract of oolong tea. Their structures were elucidated by spectroscopic methods as quercetin 3-O-[2(G)-(E)-coumaroyl-3G-O-beta-D-glucosyl-3R-O-beta-D-glucosylrutinoside] (1) and kaempferol 3-O-[2(G)-(E)-coumaroyl-3G-O-beta-D-glucosylrutinoside] (2). Compounds 1 and 2 exhibited scavenging activity against DPPH radical with EC(50) values of 30.5 and 487.2 mu M, respectively.
ISSN: 0009-2363
DOI: 10.1248/cpb.56.851
Appears in Collections:生物科技學研究所

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