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