Figure 1: IC50values were calculated from these regression equations. IC50 values of DPPH radical scavenging activity lipid peroxidation, NO radical scavenging activities and superoxide radical scavenging activity of nine different varieties of P.betle leaves (A,B,C,D,E,F,G,H & I) were compared with the IC50 value of Ascorbic Acid in each system to assess the antioxidant property of P.betle leaves.