Linyun Mou,Ya Lu,Jiale Ma,Shuwei Shu,Jianlong Li,Ganpeng Li
In response to the rapid quality degradation of peaches due to post-harvest decay, this study developed a composite film for preservation. Two primary pathogens responsible for peach decay, Aspergillus flavus and Talaromyces funiculosus , were identified. Molecular docking attributed to the main binding position of citral and geraniol's interactions with type I polyketide synthase on their antifungal effects, as well as the caffeic acid with its tyrosinase on antioxidant efficacy. β -CD-MOFs were synthesized via vapor diffusion, demonstrating exceptional spatial loading via SEM. CEOs (citral + geraniol) encapsulated in β -CD-MOFs were incorporated into a chitosan/pullulan matrix, yielding a film with 260.27 % fracture tensile strain, significantly ( P < 0.001) outperforming pure chitosan (21.87 %), possessing excellent mechanical properties, and the improvement in the water solubility of the film facilitates the release of active compounds. The utilization of a compositel film on peaches has shown significant efficacy in controlling decay index ( P < 0.05), weight loss ( P < 0.05), firmness ( P < 0.05) and production of malondialdehyde ( P < 0.05). Compared to untreated controls, the treated peaches exhibited an extended shelf life of 2 days, highlighting the superior preservation capabilities of the film. Hence, the film presents a promising solution for fruit preservation.
Lei Yang,Xuanxuan Yuan,Dian Dai,Shuqiang Wang,Ying Wu,Haihua Wang,Zhongguo Shan
The growing concern over food safety and environmental pollution has stimulated the development of multifunctional biodegradable films. Herein, β-Cyclodextrin metal-organic frameworks (β-CD-MOFs) were prepared as loading carriers for chlorogenic acid (CGA) and silver nanoparticles (Ag NPs). These materials (CGA-Ag@CD-MOFs) were then added into a zein matrix to construct bioactive packaging films (MOFs-Zein). SEM showed that appropriate content of CGA-Ag@CD-MOFs (2 wt%) promoted the formation of a more uniform and denser film structure. FT-IR verified that hydrogen bonding between CGA-Ag@CD-MOFs and zein matrix endowed MOFs-Zein-2 % with superior tensile strength (24.61 ± 2.58 MPa), elongation at break (5.01 ± 0.71 %), barrier properties of water vapor (1.84 × 10 −7 g·m −1 ·h −1 ·Pa −1 ) and oxygen (0.63 × 10 −10 g·cm/cm 2 ·s). Moreover, it can control the release of both CGA and Ag + , which displayed high-efficiency antioxidant and antimicrobial activities against Escherichia coli O157:H7 and Staphylococcus aureus . Comprehensive biosafety evaluation through cytotoxicity (Caco-2 viability >98 %), hemolysis (< 5 %), and acute toxicity studies confirmed material safety. When applied for grape storage, MOFs-Zein-2 % effectively preserved nutritional quality and texture, and prolonged the shelf-life of grapes by 16 days. Importantly, complete biodegradation occurred within 40 days. This study provides a simple strategy for constructing of high performance of biodegradable packing films.
危险品化学品经营许可证（带存储）