Journal
CHEMICAL & PHARMACEUTICAL BULLETIN
Volume 56, Issue 6, Pages 851-853Publisher
PHARMACEUTICAL SOC JAPAN
DOI: 10.1248/cpb.56.851
Keywords
Camellia sinensis; oolong tea; quercetin; kaempferol; 1,1-diphenyl-2-pierylhydrazyl
Funding
- National Science Council of the Republic of China [NSC 94-2317-B-020-001, NSC 96-2317-B-020-003]
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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 EC50 values of 30.5 and 487.2 mu M, respectively.
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