Fig. 2From: Antioxidant capacities and total phenolic contents of 20 polyherbal remedies used as tonics by folk healers in Phatthalung and Songkhla provinces, ThailandSuperoxide anion scavenging activity of water extracts prepared from Thai traditional polyherbal formulations. The water extracts inhibited superoxide anion production in a dose-dependent manner (a). The IC50 values (50% inhibitory concentration) are expressed as the mean ± SD (b). The IC50 value of catechin, a positive control, was 9.1 ± 0.3 μg/mL. Different letters indicate statistically significant differences (p < 0.01)Back to article page