Gas-regulating composite films with PBAT microsphere channels and ethylene adsorption for enhanced preservation of
Guang Nie1, Wenxuan Zhang1, Hao Ding1
1School of Materials Science and Engineering, North University of China, Taiyuan 030051, PR China; Shanxi Center of Technology Innovation for Polyamide Materials, Taiyuan 030051, PR China.
Abstract:
To address the challenge of fruit spoilage, this study developed an eco-friendly composite film (CGTZ-P) with dual functionality for gas regulation and ethylene adsorption. The film incorporates biodegradable PBAT microspheres to form porous gas-permeable channels and mesoporous nano-zeolites modified with tannic acid as ethylene scavengers. The optimized CGTZ-P1 formulation demonstrated remarkable mechanical enhancement, with tensile strength and elongation at break increasing by 455.84% and 49.45%, respectively, compared to the control film. The composite film exhibited improved CO₂/O₂ selectivity, strong antioxidant activity (DPPH radical scavenging: 72.10%; ABTS radical scavenging: 81.22%, and effective antibacterial effects against both Staphylococcus aureus and Escherichia coli. In the strawberry storage trial, the CGTZ-P1 film extended the shelf life by over 7 days at room temperature by maintaining fruit freshness, reducing weight loss, and delaying pH changes. This work provides a sustainable approach for developing multifunctional biodegradable packaging materials for fruit preservation.
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