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Two New Flavones from Tridax procumbens Linn
Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang Agriculture and Forestry University, Linan 311300, China
College of Chemistry and Life Science, Zhejiang Normal University, Jinhua 321004, China
College of Pharmacy, Henan University of Traditional Chinese Medicine, Zhengzhou 450008, China
* Author to whom correspondence should be addressed.
Received: 10 July 2010; in revised form: 11 August 2010 / Accepted: 13 August 2010 / Published: 9 September 2010
Abstract: Two new flavones, 8,3′-dihydroxy-3,7,4′-trimethoxy-6-O-β-D-glucopyranosyl flavone (1) and 6,8,3′-trihydroxy-3,7,4′-trimethoxyflavone (2) were isolated from Tridax procumbens Linn., together with the four known compounds puerarin (3), esculetin (4), oleanolic acid (5) and betulinic acid (6). The structures of the two new flavones were elucidated based on chemical analysis and spectral methods (IR, 1D and 2D NMR, ESI-MS, HR-ESI-MS). The antioxidant activity of the two new flavones were evaluated by two methods, the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity and ferric reducing antioxidant power (FRAP) assays, and the data showed that compounds 1 and 2 have certain antioxidant activity, with the antioxidant activity of compound 2 being stronger than that of compound 1.
Keywords: Tridax procumbens Linn; 8,3′-dihydroxy-3,7,4′-trimethoxy-6-O-β-D- glucopyranosyl flavone; 6,8,3′-trihydroxy-3,7,4′-trimethoxyflavone; antioxidant activity; DPPH; FRAP
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MDPI and ACS Style
Xu, R.; Zhang, J.; Yuan, K. Two New Flavones from Tridax procumbens Linn. Molecules 2010, 15, 6357-6364.
Xu R, Zhang J, Yuan K. Two New Flavones from Tridax procumbens Linn. Molecules. 2010; 15(9):6357-6364.
Xu, Runsheng; Zhang, Jing; Yuan, Ke. 2010. "Two New Flavones from Tridax procumbens Linn." Molecules 15, no. 9: 6357-6364.