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ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 7
BKCSDE 30(7)
July 20, 2009 |
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Title |
Antioxidant Flavone Glycosides from the Root of Pteroxygonum giraldii
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Author |
Bao Lin Li*, Zhan Jun Yang, Lin Ling Jiang, Xi Quan Zhang, Hong Mei Gu, Hui Chun Wang, Xian Hua Tian |
Keywords |
Pteroxygonum giraldii, Flavone glycosides, Giraldiin A, Giraldiin B, Antioxidant
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Abstract |
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.
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1459 - 1462 |
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