Fig. 2

Evaluation of antioxidant activities of Pep-A and Pep-B, inhibitions of ROS and SOD levels by antioxidant peptide A. a Antioxidant activities of Pep-A and Pep-B were evident from the decrease in ROS levels in Y79 RB cells on peptide treatment. The percentage decrease in ROS levels relative to untreated control can be noticed. * indicates the significant difference at P < 0.05 relative to 10 µM of peptide A. b Antioxidant Pep-A- and Pep-B-treated Y79 RB cells showed initial decrease in SOD activity when treated at 10–50 µM, and at 100 µM, the enzyme activity increased. SOD activity was calculated as a percentage of the inhibition activity of xanthine oxidase and depicted as increase/decrease relative to untreated control. Data points indicate mean ± SEM of duplicate values. * indicates the significant difference at P < 0.05 relative to 50 µM of Pep-A