College of Food Science and Engineering, Shandong Agricultural University, Taian 271000, PR China; College of Chemistry and Material Science, Shandong Agricultural University, Taian 271000, PR China.
College of Chemistry and Material Science, Shandong Agricultural University, Taian 271000, PR China; Key Laboratory of Agricultural Film Application of Ministry of Agriculture and Rural Affairs, Taian 271000, PR China.
Int J Biol Macromol. 2024 Jun;272(Pt 1):132893. doi: 10.1016/j.ijbiomac.2024.132893. Epub 2024 Jun 3.
Foodborne pathogens result in a great harm to human, which is an urgent problem to be addressed. Herein, a novel cellulose-based packaging films with excellent anti-bacterial properties under visible light were prepared. A porphyrin-based covalent organic polymer (Por-COPs) was constructed, then covalently grafted onto dialdehyde cellulose (DAC). The addition of Por-COPs enhanced the mechanical, hydrophobicity, and water resistance of the DAC-based composite films. DAC/Por-COP-2.5 film exhibited outstanding properties for the photodynamic inactivation of bacteria under visible light irradiation, delivering inactivation efficiencies of 99.90 % and 99.45 % towards Staphylococcus aureus and Escherichia coli within 20 min. The DAC/Por-COPs films efficiently generated •O and O under visible light, thereby causing oxidative stress to cell membranes for bacterial inactivation. The prepared composite film forms a protective barrier against bacterial contamination. Results guide the development of high performance and more sustainable packaging films for the food sector.
食源性致病菌对人类健康造成极大危害，是亟待解决的问题。本研究制备了一种新型的具有可见光下优异抗菌性能的纤维素基包装膜。构建了基于卟啉的共价有机聚合物（Por-COPs），然后将其共价接枝到二醛纤维素（DAC）上。Por-COPs 的添加增强了 DAC 基复合膜的机械性能、疏水性和耐水性。在可见光照射下，DAC/Por-COP-2.5 膜对金黄色葡萄球菌和大肠杆菌具有出色的光动力灭活性能，在 20 分钟内的灭活效率分别达到 99.90%和 99.45%。DAC/Por-COPs 膜在可见光下有效产生•O 和 O，从而对细胞膜造成氧化应激，实现细菌失活。所制备的复合膜形成了对细菌污染的保护性屏障。研究结果为食品领域开发高性能和更可持续的包装膜提供了指导。
