Dynamically crosslinked chitosan/cellulose nanofiber-based films integrated with γ-cyclodextrin/curcumin inclusion complex as multifunctional packaging materials for perishable fruit

Robust biomass-derived packaging films with excellent antimicrobial and antioxidative properties are highly desired for preservation of the perishable fruit. However, most reported packaging films rely on introducing artificial antibacterial and antioxidant agents and their abuse could cause severe safety and environmental issues. To address these drawbacks, herein, we developed a dynamically crosslinked chitosan/cellulose nanofiber-based packaging film integrated with γ-cyclodextrin/curcumin inclusion complex where curcumin is an edible natural photosensitizer with excellent photodynamic antimicrobial and antioxidative properties. The resulting composite packaging material can be easily applied as conformal coating or package film on different types of perishable fruits. Adopting banana, tomato and cut apple slices as representative examples, we demonstrate that this material can effectively extend their shelf life by reducing microbial invasion, water loss and oxidation thanks to its excellent photodynamic antimicrobial and antioxidative properties. This work provides a promising strategy to develop sustainable, low-cost and environmentally friendly packaging materials from readily available biodegradable biomass sources to extend the shelf life of perishable produce.