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Phenolic Antioxidants Isolated from the Flowers of Osmanthus fragrans
Department of Food Nutrition, Chung Hwa University of Medical Technology, No.89, Wenhua 1st St., Rende Dist., Tainan City 71703, Taiwan
* Author to whom correspondence should be addressed.
Received: 21 July 2012; in revised form: 21 August 2012 / Accepted: 5 September 2012 / Published: 7 September 2012
Abstract: O. fragrans has slightly less antioxidative activity than green tea. Five phenolic compounds, tyrosyl acetate (1), (+)-phillygenin (2), (8E)-ligustroside (3), rutin (4), and verbascoside (5), were isolated from the CHCl3 sub-extract of O. fragrans. The structures were elucidated by interpreting their spectral data. Evaluation of the antioxidative property of the isolated (+)-phillygenin (2), rutin (4), and verbascoside (5) revealed strong DPPH radical scavenging activity, with IC50 values of 19.1, 10.3, and 6.2 μM, respectively. These isolates also exhibited an H2O2 scavenging ability, with IC50 values of 10.5, 23.4, and 13.4 μM, respectively.
Keywords: Osmanthus fragrans; Oleaceae; antioxidative activity; DPPH scavenging activity; H2O2 scavenging ability; phenolic antioxidant
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MDPI and ACS Style
Hung, C.-Y.; Tsai, Y.-C.; Li, K.-Y. Phenolic Antioxidants Isolated from the Flowers of Osmanthus fragrans. Molecules 2012, 17, 10724-10737.
Hung C-Y, Tsai Y-C, Li K-Y. Phenolic Antioxidants Isolated from the Flowers of Osmanthus fragrans. Molecules. 2012; 17(9):10724-10737.
Hung, Chien-Ya; Tsai, Yu-Cheng; Li, Kuo-Yu. 2012. "Phenolic Antioxidants Isolated from the Flowers of Osmanthus fragrans." Molecules 17, no. 9: 10724-10737.