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- W2125532683 abstract "Antioxidant activity-guided fractionations of chloroform extract of Swertia minor yielded five known tetraoxygenated xanthones (1–5), of which compound 3 was isolated for the first time from plant sources. Compounds 1–5 were identified with the aid of extensive NMR spectroscopic studies. A relationship between the structural features of 1–5 and their antioxidant activity was also determined. Among these bioactive isolates (1–5), compound 4 exhibited strong scavenging effect in DPPH (IC50 = 10.31 µg mL−1), FRAP (8536.32 ± 34.1 Mmol Fe (II) g−1) and metal chelating (17.2 ± 0.88 mg EDTA g−1) assays. Compound 5 was potently active in secondary antioxidant assay (i.e. binding to metal ions strongly); however, its primary antioxidant capacity was found to be feeble." @default.
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- W2125532683 date "2012-07-01" @default.
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- W2125532683 title "Antioxidant and structure–activity relationships of five tetraoxygenated xanthones from<i>Swertia minor</i>(Griscb.) Knobl." @default.
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- W2125532683 doi "https://doi.org/10.1080/14786419.2011.561494" @default.
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