Antioxidant Flavone Glycosides from the Root of Pteroxygonum giraldii

• Published in: Bulletin of the Korean Chemical Society Vol. 30; no. 7; pp. 1459 - 1462
• Main Authors: Li, Bao-Lin, Yang, Zhan-Jun, Jiang, Lin-Ling, Zhang, Xi-Quan, Gu, Hong-Mei, Wang, Hui-Chun, Tian, Xian-Hua
• Format: Journal Article
• Language: Korean
• Published: 2009
• Subjects: Giraldiin B; Giraldiin A; Pteroxygonum giraldii; Flavone glycosides; Antioxidant
• ISSN: 0253-2964; 1229-5949

Two new flavone glycosides, giraldiin A and B, together with three known compounds, annulatin, myricetin 3-O-$\alpha$- 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'-($\alpha$-L-arabinopyranosyloxy)-4',5,5',7- tetrahydroxy-3-methoxyflavone and 4'-($\beta$-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 $Fe^{2+}-H_2O_2$ Fenton radical generating system. The results indicated the hydroxyl free radical scavenging activity of giraldiin A (E$D_{50}$ = 23.7 nmol/mL) is higher than that of some known antioxidants such as rutin, puerarin, daidzein and 2,6-di-tertbutyl-4-methylphenol.