Antibacterial and Antioxidant Compounds from the Flower Extracts of Vernonia amygdalina

Table 2

Radical scavenging activities of the extracts and constituents of the flowers of V. amygdalina.

Chloroform extract		Acetone extract	Isorhamnetin	Vernolide
Concentration (µg/mL)	% DPPH inhibition	% DPPH inhibition	% DPPH inhibition	% DPPH inhibition
12.5	32.8 ± 0.2	69.0 ± 1.1	76.5 ± 0.5	24 ± 0.4
25	37.1 ± 0.9	74.5 ± 0.4	84 ± 0.6	31 ± 2.0
50	43.0 ± 0.4	83.0 ± 0.2	88 ± 0.8	37 ± 0.8
100	54.1 ± 0.5	91.6 ± 0.8	94 ± 0.1	49 ± 0.2

The results are reported as mean ± SD of three replicates. Ascorbic acid was used as the positive control with % DPPH inhibition of 97.7.