Preparation of pectin/agar-based functional films integrated with zinc sulfide nano petals for active packaging applications

Here we report on the robust synthesis of zinc sulfide nanoparticles (ZnSNP) using a simple one-pot reaction. The prepared ZnSNP was characterized and confirmed to be a petal-shaped nanoparticle. The ZnSNP was added to fabricate the pectin/agar-based functional composite film. The integration of ZnSNP has greatly improved the physical properties of the film, such as mechanical and UV protection properties, without significantly changing the transparency of the film. The addition of the nanofillers did not affect the film's hydrophobicity, water vapor barrier, and thermal properties. Moreover, the composite film showed intense antibacterial activity against foodborne pathogenic bacteria, E. coli and L. monocytogenes. The functional bio-nanocomposite films based on pectin/agar have high potential in active packaging applications.

Automated summary

In this study, zinc sulfide nanoparticles were successfully synthesized using a simple one-pot reaction method and integrated into pectin/agar-based functional composite films. The resulting films exhibited improved mechanical properties, UV protection, and strong antibacterial activity against E. coli and L. monocytogenes, making them ideal for active packaging applications. The transparency, hydrophobicity, water vapor barrier, and thermal properties of the films were maintained after the addition of the nanofillers.