Study on properties of polyvinyl alcohol/nanocellulose/pomegranate peel polyphenol composite antibacterial films

Abstract

Objective: This study aimed to develop a kind of green antibacterial and antioxidant food packaging film. Methods: Polyvinyl alcohol/nanocellulose crystal/pomegranate peel polyphenol composite antibacterial films were prepared by blending method with pomegranate peel polyphenol as functional active substance, and their properties were characterized. Results: The continuity of the film surface was affected by the addition of pomegranate peel polyphenols. When the addition of polyphenols in pomegranate peel was 5 times the minimum bacteriostatic concentration, the water permeability of the film increased by 28.79%, and the tensile strength, elongation at break, hydrophobicity and light transmittance decreased by 44.97%, 29.37%, 36.36% and 22.35%, respectively. The total phenol content was (5.92±0.17) mg/L, and the DPPH radical scavenging rate was (13.31±0.22)%. The film showed good bacteriostasis, and had the best bacteriostasis effect on Candida albicans, followed by Staphylococcus aureus and Escherichia coli. Conclusion: The PVA/CNC/PPE composite antibacterial film has good performance and is a new active food packaging material. composite antibacterial film is a new type of active food packaging material.

Keywords

• pomegranate peel polyphenols
• polyvinyl alcohol
• nanocellulose crystal
• antioxidant
• antibacterial composite film