Figure 3.

Concentration-response curves of in vitro free-radical scavenging capacity assays. Chemical free radicals: (a) DPPH; (b) ABTS; (c) H₂O₂ were used to assess in vitro free-radical scavenging capacities of R.RBE and P.RBE. IC₅₀ values of RBEs and positive controls (gallic acid, quercetin and vitamin C) were determined through identification of concentrations of test samples required to scavenge free radicals by 50% from respective concentration-response curves. Data are expressed as mean ± SEM (n = 3).