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Molecules 2010, 15(10), 6722-6732; doi:10.3390/molecules15106722

Antioxidant Activities of Caragana sinica Flower Extracts and Their Main Chemical Constituents

1 Key Laboratory of Medicinal Chemistry for Nature Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, Yunnan, P.R. China 2 Department of Applied mathematics, Kunming University of Science and Technology, Kunming 650093, P.R. China 3 Technology Center, Hongyun-Honghe Tobacco (Group) Co. Ltd., Kunming 650202, P.R. China
* Author to whom correspondence should be addressed.
Received: 10 August 2010 / Revised: 4 September 2010 / Accepted: 16 September 2010 / Published: 28 September 2010
(This article belongs to the Special Issue Antioxidants)
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The edible flowers of Caragana sinica are used in China a kind of health-promoting vegetable. In this study, the antioxidant activities of its ethanol extract, as well as its petroleum ether, ethyl acetate, n-butanol and water fractions, were evaluated through in vitro model systems including the DPPH, FRAP and β-carotene bleaching methods. Among the C. sinica flower extracts the ethyl acetate fraction was the most effective. Correlation analysis suggested that flavonoids might be the major contributors to the high antioxidant activity of this flower. Six flavonoids including quercetin (1), isoquercitrin (2), rutin (3), quercetin-3′-O-methyl-3-O-α-L-rhamnopyranosyl (1→6)-β-D-glucopyranoside (4), typhaneoside (5) and quercetin-3-O-β-D-glucopyranosyl(1→2)[α-L-rhamnopyranosyl (1→6)]-β-D-glucopyranoside (6), were isolated from this flower for the first time. Their contents were determined by a HPLC method. Compounds 3 and 4 were found to be the major flavonoids, with concentrations of 1.20 ± 0.07 and 3.94 ± 0.12 mg/g dry sample, respectively. These results demonstrated that the C. sinica flowers may be valuable natural antioxidant sources and are potentially applicable in the health food industry.
Keywords: Caragana sinica; antioxidant activity; flavonoid Caragana sinica; antioxidant activity; flavonoid
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Tai, Z.-G.; Cai, L.; Dai, L.; Sun, W.-J.; Zhe, W.; Yang, Y.-B.; Cao, Q.-E.; Ding, Z.-T. Antioxidant Activities of Caragana sinica Flower Extracts and Their Main Chemical Constituents. Molecules 2010, 15, 6722-6732.

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