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• W2402663824 abstract "Total alcohol and successive extracts (diethyl ether, chloroform, ethyl acetate and n-butanol) of Covolvulus hystrix Vahl were screened for their antioxidant activity using free radical 2-2-diphenyl-1-picrylhydrazyl (DPPH) and Trolox as reference substance. The tested extracts showed variable antioxidant activities. The highest antioxidant activity was achieved in total alcohol (48.32%) followed by ethyl acetate (37.8%) and n-butanol (32.96%) extracts. From the ethyl acetate extract four compounds were isolated and identified as quercetin, quercetin 3-0-rutinoside and quercetin-7-O-rhamnoside in addition to ferulic acid using different spectroscopic analysis such as, 1HNMR, 13CNMR, COSY, HMBC and HMQC." @default.
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• W2402663824 date "2011-04-01" @default.
• W2402663824 modified "2023-10-13" @default.
• W2402663824 title "Antioxidant activity of Convolvulus hystrix Vahl and its chemical constituents." @default.
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