The stable radical DPPH has been used widely for the determination of primary anti-oxidant
activity24. The DPPH anti-oxidant assay is based on the ability of DPPH, a stable free radical to decolorize
in the presence of anti-oxidants. The methanol extracts of leaves of A. paniculata recorded the highest
scavenging activity of 54% at 0.7 mg/mL and 52% at 0.9 mg/mL followed by ethanolic extract of leaves of T. cordifolia consisting 51% at 0.9 mg/mL. Both have lower scavenging activity, when compared to
synthetic anti-oxidant butylated hydroxyl anisole (BHA).