Biodegradable packaging films with ε-polylysine/ZIF-L composites
Lei Zhang, Ziyuan Wang, Ziyuan Wang, Yi Jiao, Zichen Wang, Zichen Wang, Xiuming Tang, Zhanxin Du, Zeyang Zhang, Shihai Lu, Changsheng Qiao, Jiandong Cui
Abstract
Recent years, biobased polymer packaging film in food packaging has witnessed great developments. However, it is still a challenge to develop biodegradable packaging films with antimicrobial property and mechanical strength. Herein, agar and polyvinyl alcohol (PVA)/Chitosan (CS) packaging films with ε-polylysine/ZIF-L nanocomposites (ε[email protected]) were developed for the first time. Due to the incorporation of the nanocomposite, UV/visible light barrier properties (the transmittance decreased by 10.9%) of the films were improved, and the elongation at break of the composite agar films were increased by 43.0%. In the antimicrobial assays, with 4% ε[email protected], the inhibition zone diameters against Bacillus subtilis were 10 times as compared with the pure PVA/CS film. Furthermore, compared with commercial PE film, agar films and PVA/CS films with 4% ε[email protected] nanocomposites could provide long-term protection for strawberry to avoid the microbial infection and prolong the shelf life of the fruit at 25 °C. The results suggested that the agar and PVA/CS packaging films with ε[email protected] nanocomposites could significantly behave as potent antibacterial material in food packaging and preservation systems.