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 nbutanol (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, 1 HNMR, 13CNMR, COSY, HMBC and HMQC
