To develop active biodegradable packaging materials, in this study, a multifunctional (antimicrobial, antioxidant, and controlled-release) packaging film was prepared by encapsulating eugenol (EG) in IRMOF-3 (EG/IRMOF-3) and blending it with a zein-based film by solution casting method.The micro-morphology, chemical structure, physicochemical properties, antioxidant, antimicrobial, and controlled-release characteristics of the composite film were investigated.Scanning electron microscopy and Fourier transform infrared spectroscopy analysis showed that the incorporation of EG/IRMOF-3 did not cause any damage to the film structure, and the compatibility and hydrogen bonding existed.The addition of EG/IRMOF-3 significantly improved the mechanical and barrier properties of the films.When the addition of EG/IRMOF-3 was 8%, the composite film had the lowest water vapor permeability[2.17×10-11 g/(m·s·Pa)], and the tensile strength could reach 11.82 MPa, which was significantly better than that of pure zein films and showed good UV blocking performance, antioxidant, and antimicrobial properties.The free radical scavenging rates of DPPH free radicals and ABTS cationic radicals were increased to 91.29% and 93.79%, respectively, and the diameter of the inhibition zone against Staphylococcus aureus and Escherichia coli could be up to (11.24±0.37) mm and (11.82±0.32) mm, respectively.In addition, the eugenol had a slow-release property in composite films.Overall, the zein/EG/IRMOF-3 film has a good application prospect as a food-active packaging material.
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