Novel antimicrobial biodegradable composite films as packaging materials based on shellac/chitosan, and ZnAlO or CuAlO spinel nanoparticles.

ZnAlO and CuAlO spinel nanoparticles were prepared by a modified Pechini method and used with the natural chitosan (CS) and shellac (SH) polymers to form novel composite membranes as promising food packaging materials. The selection of ZnAlO and CuAlOspinel nanoparticles was based on their antibacterial characteristics, availability, and economy. Using a straightforward and adaptable solution mixing and casting method, the bio-composites were created.