Fig. 5. Antioxidative activities of the Jin Guanyin extracts by ABTS and DPPH assays. (a) Dose-dependent inhibition actions of STE and ATE and trolox on ABTS˙⁺ and its linearity correlation. (b) Dose-dependent inhibition actions of STE and ATE and trolox on DPPH˙ free radicals and its linearity correlation. (c) IC₅₀ values of STE. Each value represents means ± SD (n = 3). * and ** indicate statistical difference at P < 0.05 and P < 0.01 level by comparing with trolox group.