摘要
Bilayer film incorporating hesperidin was made for antioxidant food preservation. • Corona treatment improved the structural stability of the bilayer films. • Hesperidin enhanced the film's antioxidant activity, particularly at 3 wt%. • P-PCH3 film excelled in mechanical, barrier, and antioxidant properties. • P-PCH3 film well-preserved the arils, cutting oxidative stress and quality loss. As concerns about environmental sustainability and food safety rise, the demand for biodegradable antioxidant packaging solutions has increased. This study develops a biodegradable bilayer composite film for antioxidant food packaging, consisting of a commercial polylactic acid (PLA) substrate coated with a polyvinyl alcohol/chitosan (PVA/CS) layer enriched with hesperidin. Bilayer films were prepared using solution casting and corona treatment, improving adhesion and structural integrity. PLA layer provides water vapor barrier and UV resistance, while the PVA/CS coating loaded with hesperidin offers mechanical strength, oxygen barrier property, and antioxidant properties. Hesperidin formed an intercalation structure in the matrix, promoting the development of hydrogen, ester, and amide bonds and enhancing corresponding film crystallinity and thermostability. Bilayer films with hesperidin exhibited improved mechanical properties, hydrophobicity, thermostability, visible light transmittance, and barrier properties (moisture, oxygen, UV), particularly the film containing 3 wt% hesperidin (P-PCH3). P-PCH3 film demonstrated significant antioxidant activity, evidenced by 89.3% DPPH scavenging and 90.2% ABTS +· scavenging. In a storage experiment, the P-PCH3 film effectively preserved the quality of pomegranate arils by mitigating oxidative stress, enzymatic browning, and weight loss. This biodegradable antioxidant packaging offers a scalable, eco-friendly solution for food preservation, addressing both food safety and environmental challenges in the packaging industry.
危险品化学品经营许可证（带存储）