The antioxidant activity of the RE was performed based on the
reduction of the free radical DPPH by antioxidants present in the
plant extract. This results in a decrease of aDPPHradical absorbance
at 515 nm. Fig. 3 shows the scavenging activity variation provided
by RE at different concentrations (0.02%, 0.05%, and 0.08%) comparatively
to a synthetic antioxidant (BHT).