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Molecules 2010, 15(2), 672-679; doi:10.3390/molecules15020672

A New Flavone C-Glycoside from Clematis rehderiana

1, 1 and 1,*
1 State Key Laboratory of Phytochemistry and Plant Resources of West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, China 2 Key Laboratory of Marine Bioresources Sustainable Utilization, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
* Author to whom correspondence should be addressed.
Received: 24 December 2009 / Revised: 28 January 2010 / Accepted: 29 January 2010 / Published: 29 January 2010
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A new flavone C-glycoside, isovitexin 6″-O-E-p-coumarate (1) and two known flavonoid glycosides—quercetin 3-O-β-D-glucuronopyranoside (2) and isoorientin (3)—were isolated from an ethanol extract of aerial parts of Clematis rehderiana. Their structures were determined by spectroscopic methods. The antioxidant effects of the two flavone C-glycosides were evaluated by both the MTT and DPPH assays. Compound 1 showed potent activities against H2O2-induced impairment in PC12 cells within the concentration range tested, whereas compound 3 scavenged DPPH radical strongly, with an IC50 value of 13.5 μM.
Keywords: Clematis rehderiana; flavonoide glycosides; antioxidant Clematis rehderiana; flavonoide glycosides; antioxidant
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Du, Z.-Z.; Yang, X.-W.; Han, H.; Cai, X.-H.; Luo, X.-D. A New Flavone C-Glycoside from Clematis rehderiana. Molecules 2010, 15, 672-679.

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