Structural Determination and DPPH Radical-Scavenging Activity of Two Acylated Flavonoid Tetraglycosides in Oolong Tea (Camellia sinensis)

Viola Szu-Yuan Lee; Chiy-Rong Chen; Yun-Wen Liao; Jason Tze-Cheng Tzen; Chi-I Chang

doi:10.1248/cpb.56.851

Notes

Structural Determination and DPPH Radical-Scavenging Activity of Two Acylated Flavonoid Tetraglycosides in Oolong Tea (Camellia sinensis)

Viola Szu-Yuan Lee, Chiy-Rong Chen, Yun-Wen Liao, Jason Tze-Cheng Tzen, Chi-I Chang

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Keywords: Camellia sinensis, oolong tea, quercetin, kaempferol, 1,1-diphenyl-2-picrylhydrazyl

JOURNAL FREE ACCESS

2008 Volume 56 Issue 6 Pages 851-853

DOI https://doi.org/10.1248/cpb.56.851

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Abstract

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-3^G-O-β-D-glucosyl-3^R-O-β-D-glucosylrutinoside] (1) and kaempferol 3-O-[2^G-(E)-coumaroyl-3^G-O-β-D-glucosyl-3^R-O-β-D-glucosylrutinoside] (2). Compounds 1 and 2 exhibited scavenging activity against DPPH radical with EC₅₀ values of 30.5 and 487.2 μM, respectively.

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