Poly (lactic) acid‐poly(3‐hydroxybutyrate‐co‐4‐hydroxybutyrate) (PLA‐PHB) blends were prepared through melting method and incorporated with α‐tocopherol. The structural, thermal, mechanical and antioxidant properties of resulting active films were characterized, and its preservation effect on peaches (Prunus persica L.) was investigated. Results revealed that the glass transition temperature (T_g) of PLA film was reduced from 53.2°C to 39.7°C after addition of plasticizer but increased again to 43.3°C after supplementation with α‐tocopherol. PLA‐PHB are polyesters with carboxylic groups that interacted with the hydroxide groups of α‐tocopherol. Furthermore water vapour permeability, gas permeability and elongation at break were significantly improved, and 72.1% 2,2‐diphenyl‐1‐picrylhydrazyl free radical scavenging activity was observed. PLA‐PHB‐α‐tocopherol group revealed higher combined water and less oxidative spoilage through low‐field nuclear magnetic resonance (LF‐NMR) and effectively extended the shelf life of peach. Thus, the plasticized PLA‐PHB‐α‐tocopherol film can be used as an active biodegradable packaging for fruits and vegetables.

中文翻译：

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利用α-生育酚用于桃子贮藏的可生物降解的聚乳酸-乳酸-3-羟基丁酸酯-co-4-羟基丁酸酯薄膜的增强的机械和抗氧化性能

通过熔融方法制备了聚乳酸-聚（3-羟基丁酸酯-co-4-羟基丁酸酯）（PLA-PHB）共混物，并与α-生育酚混合。表征了所得活性膜的结构，热，机械和抗氧化性能，并研究了其对桃（Prunus persica L.）的保鲜效果。结果表明，玻璃化转变温度（T _g）添加增塑剂后，PLA膜的温度从53.2°C降至39.7°C，但补充α-生育酚后再次升高至43.3°C。PLA‐PHB是具有与α-生育酚的氢氧根相互作用的羧基的聚酯。此外，水蒸气渗透性，气体渗透性和断裂伸长率得到了显着改善，并且观察到了72.1％的2,2-二苯-1--1-吡啶并肼基自由基清除活性。PLA-PHB-α-生育酚基团通过低场核磁共振（LF-NMR）显示出更高的混合水含量和更少的氧化变质，并有效地延长了桃子的保质期。因此，增塑的PLA-PHB-α-生育酚薄膜可以用作水果和蔬菜的活性生物降解包装。