目的 包装薄膜的气体透过性是调控果蔬采后微环境的核心。本研究通过设计薄膜透气性,调节包装内O2和CO2的动态平衡,从而抑制香水柠檬的呼吸代谢,在实现采后护绿的同时延缓生理衰老,最终有效延长保鲜期。方法 通过熔融挤出制备不同梯度的聚（乳酸）（PLA）和聚对苯二甲酸-己二酸丁二醇酯（PBAT）复合膜,探究复合膜阻隔性能、机械等性能,并将其应用于香水柠檬的保鲜实验,通过袋内气体成分分析、质量损失率以及叶绿素含量等理化指标评估了薄膜对果实外观维持的能力。结果 3PLA-7PBAT组别的复合薄膜（PLA/PBAT/热塑性淀粉的比例为16/64/20）展现出优异的气体调节能力,其O2透过量为（221.02±58.74）cm3/（m2·24 h·0.1 MPa）。这种性能组合使其在常温保鲜实验中能够维持包装内理想的气体环境,从而有效抑制叶绿素降解,更好地保持了香水柠檬的特有色泽,将护绿周期相比于裸露组延长了250%。结论 本研究证实,PLA和PBAT组分的比例是调控PLA/PBAT/TPS复合薄膜性能及其香水柠檬护绿效果的关键。其中,3PLA-7PBAT组别薄膜通过精准调节气体透过性,优化了包装微环境,从而表现出最佳的护绿效果。该研究为生物基包装材料的绿色化与功能化设计提供了新思路。
Abstract
The gas permeability of packaging films is crucial for regulating the post-harvest micro-environment of fruits and vegetables. The work aims to extend the freshness preservation period of perfume lemon by designing the gas permeability of the films to regulate the dynamic balance of O2 and CO2 inside the packaging, thereby inhibiting respiration, maintaining green color, and delaying physiological senescence. Composite films with different gradients of polylactic acid (PLA) and poly (butylene adipate-co-terephthalate) (PBAT) were prepared via melt extrusion to investigate the barrier properties and mechanical performance of the composite films. Then, the films were subsequently applied in the preservation experiment of perfume lemon. The ability of the films to maintain fruit appearance was evaluated through physicochemical indicators, including analysis of gas composition inside the package, weight loss rate, and chlorophyll content. The 3PLA-7PBAT composite film (PLA/PBAT/thermoplastic starch ratio of 16/64/20) demonstrated excellent gas regulation capability, with an O2 transmission rate of (221.02±58.74) cm3/(m2·24 h·0.1 MPa). This combination of properties enabled it to maintain an ideal gas atmosphere inside the packaging during room-temperature preservation experiments, effectively suppressing chlorophyll degradation and preserving the characteristic color of fragrance lemon. Consequently, the green-retention period was prolonged by 250% compared with that of the untreated group. In conclusion, this research confirms that the ratio of PLA to PBAT is key to regulating the properties of PLA/PBAT/TPS composite films and their green-keeping effect on perfume lemons. The 3PLA-7PBAT composite film exhibits the best green-keeping performance by precisely adjusting gas permeability and optimizing the packaging micro-environment. This research provides new insights for the green and functional design of bio-based packaging materials.
关键词
可降解薄膜 /
气体透过性 /
香水柠檬 /
货架期
Key words
biodegradable film /
gas permeability /
perfume lemon /
shelf life
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基金
上海市科技创新行动计划（23N31900200）
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