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Antioxidant activity of PEESG. The antioxidant activity of PEESG was evaluated by DPPH radical scavenging assay (a), ABTS radical scavenging assay (b), and reducing power evaluation (c). Each experiment was repeated three times, and results represent the mean ± SD. Ascorbic acid was employed as a positive control. ∗ and ∗∗ mean P < 0.05 and P < 0.01 correspondingly compared with ascorbic acid group.
