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Phenolic Compounds from the Twigs of Stewartia pseudocamellia  

Bae, Jong Jin (Department of Oriental Pharmacy, Woosuk University)
Kwak, Jong Hwan (School of Pharmacy, Sungkyunkwan University)
Publication Information
Korean Journal of Pharmacognosy / v.46, no.4, 2015 , pp. 303-308 More about this Journal
Abstract
Ten phenolic compounds were isolated from the twigs of Stewartia pseudocamellia. The isolated compounds were identified as 5,7,3',5'-tetrahydroxyflavanone (1), 3,5,7,3',5'-pentahydroxyflavanone (2), quercetin (3), (+)-aromadendrin (4), (+)-ampelopsin (5), myricetin (6), (+)-catechin (7), (-)-epicatechin (8), kaempferol (9), and fraxin (10) by spectroscopic analysis. Compounds 1, 2, 4, 6, 8, and 9 were isolated from this plant for the first time. The antioxidant activities of compounds 1-10 were evaluated by the DPPH and/or ORAC (oxygen radical absorbance capacity) assay. Compounds 3, 5-9 showed significant antioxidative effects on DPPH assay. Among the active compounds, 6 exhibited higher activity compared to trolox on ORAC assay.
Keywords
Stewartia pseudocamellia; Phenolic compound; Antioxidant activity; DPPH assay; ORAC assay;
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Times Cited By KSCI : 5  (Citation Analysis)
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