Fig. 1.

In vitro antioxidant activities of TBHE, TBCE, TBEE, TBBE and TBWE together with reference compounds. a Total antioxidant activity compared with Trolox, all values are highly significant with p < 0.001 versus control (0 μg/ml), b DPPH radical scavenging compared to ascorbic acid, 20, 50 and 100 µg/ml of TBHE have a significance level of p < 0.05, 10 and 80 µg/ml of TBHE have a significance level of p < 0.01 and the rest of the values are highly significant with p < 0.001. All values are compared to control (0 μg/ml), c reducing power activity compared to ascorbic acid, all values are highly significant at a level of p < 0.001 versus control (0 µg/ml). The results are represented as mean ± S.D. of six parallel measurements. AA ascorbic acid