Research and Development Center of Food Proteins, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, South China University of Technology, Guangzhou, 510640, PR China.
Research and Development Center of Food Proteins, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, South China University of Technology, Guangzhou, 510640, PR China; State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, PR China.
Carbohydr Polym. 2018 Feb 1;181:727-735. doi: 10.1016/j.carbpol.2017.11.085. Epub 2017 Nov 26.
Biodegradable food packaging is sustainable and has a great application prospect. PLA is a promising alternative for petroleum-derived polymers. However, PLA packaging suffers from poor barrier properties compared with petroleum-derived ones. To address this issue, we designed bilayer films based on PLA and Pickering emulsions. The formed bilayer films were compact and uniform and double layers were combined firmly. This strategy enhanced mechanical resistance, ductility and moisture barrier of Pickering emulsion films, and concomitantly enhanced the oxygen barrier for PLA films. Thymol loadings in Pickering emulsion layer endowed them with antimicrobial and antioxidant activity. The release profile of thymol was well fitted with Fick's second law. The antimicrobial activity of the films depended on film types, and Pickering emulsion layer presented larger inhibition zone than PLA layer, hinting that the films possessed directional releasing role. This study opens a promising route to fabricate bilayer architecture creating synergism of each layer.
可生物降解的食品包装具有可持续性，应用前景广阔。聚乳酸（PLA）是一种有前途的石油基聚合物替代品。然而，与石油基聚合物相比，PLA 包装的阻隔性能较差。为了解决这个问题，我们设计了基于 PLA 和 Pickering 乳液的双层薄膜。形成的双层薄膜致密且均匀，双层结合牢固。该策略提高了 Pickering 乳液膜的机械强度、延展性和防潮性，同时提高了 PLA 膜的氧气阻隔性。百里香精油负载在 Pickering 乳液层中，赋予其抗菌和抗氧化活性。百里香精油的释放曲线符合菲克第二定律。薄膜的抗菌活性取决于薄膜类型，Pickering 乳液层比 PLA 层呈现出更大的抑菌圈，表明薄膜具有定向释放作用。本研究为制备协同各层的双层结构开辟了一条有前景的途径。
