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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 7
BKCSDE 30(7)
July 20, 2009 

Antioxidant Flavone Glycosides from the Root of Pteroxygonum giraldii
Bao Lin Li*, Zhan Jun Yang, Lin Ling Jiang, Xi Quan Zhang, Hong Mei Gu, Hui Chun Wang, Xian Hua Tian
Pteroxygonum giraldii, Flavone glycosides, Giraldiin A, Giraldiin B, Antioxidant
Two new flavone glycosides, giraldiin A and B, together with three known compounds, annulatin, myricetin 3-O-α- L-rhamnopyranoside and gallic acid, were isolated from the ethanol extract of the root of Pteroxygonum giraldii Damm. et Diels. The structures of giraldiin A and B are designated as 3'-(α-L-arabinopyranosyloxy)-4',5,5',7- tetrahydroxy-3-methoxyflavone and 4'-(β-D-glucopyranosyloxy)-5,5',7-trihydroxy-2',3-dimethoxyflavone, respectively, on the basis of detailed spectroscopic analyses. The free radical scavenging activity of giraldiin A was evaluated by decolouring spectrophotometry of pentamethine cyanine dye (Cy5) with Fe2+-H2O2 Fenton radical generating system. The results indicated the hydroxyl free radical scavenging activity of giraldiin A (ED50 = 23.7 nmol/mL) is higher than that of some known antioxidants such as rutin, puerarin, daidzein and 2,6-di-tertbutyl- 4-methylphenol.
1459 - 1462
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