Film antioxidant activity was assessed by the DPPH scavengi ngmethod. Fig. 2b shows the antioxidant activity of different ZEO-formulated CMC films. As expected, the control film showed low antioxidant activity, and the DPPH scavenging activity of the films significantly increased (P < 0.05) with an increase in ZEO concentrations. ZEO-containing films at a level of 3% had the highest