Antioxidant activity of extracts of I. purpurea leaves assessed by DPPH and FRAP assays. (a) DPPH radical scavenging activity of I. purpurea leaves extracts (ethanol, chloroform, and aqueous) was assessed at different concentrations (20-400 μg/ml) in terms of free radical inhibition percentage. (b) Ferric reducing antioxidant power of extracts of I. purpurea leaves (ethanol, chloroform, and aqueous) assessed at different concentrations (20-400 μg/ml) in terms of FRAP value expressed in μmol Fe2+.