Properties enhancement of antimicrobial chitosan-deposited polylactic acid films via cold plasma treatment

Journal of Food and Health Pub Date : 2023-01-01 DOI:10.53388/fh2023011

Guiyun Chen, Tong Yang, Yu-He Wang, Shuhong Li, Ye Chen

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Abstract

The present study aimed to understand the effect of dielectric barrier discharge cold plasma (DBD-CP) technology on the antimicrobial chitosan deposition and the properties enhancement of polylactic acid (PLA) films. The results indicated that DBD-CP was an effective method for improving the adhesion and surface hydrophilicity of PLA, facilitating the deposition of chitosan coating. This modification was attributed to the increased surface roughness, as well as the presence of polar functional groups observed through atomic force microscopy, surface free energy and Fourier transform infrared spectroscopy analysis. The study further revealed that both water resistance and mechanical properties were significantly improved after DBD-CP treatment, which was positively correlated with the amount of chitosan deposited on the PLA surfaces. Following comprehensive evaluation, the treatment at 75 W was determined as the optimal condition for enhancing the properties. Additionally, the modified film exhibited strong antimicrobial activity against Staphylococcus aureus. Consequently, the DBD-CP technology could be a promising tool for better utilization of PLA-based materials in the antibacterial food packaging industry.

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冷等离子体处理增强抗菌壳聚糖聚乳酸膜的性能

本研究旨在了解介质阻挡放电冷等离子体(DBD-CP)技术对抗菌壳聚糖沉积及聚乳酸(PLA)膜性能增强的影响。结果表明，DBD-CP是提高聚乳酸的附着力和表面亲水性的有效方法，有利于壳聚糖涂层的沉积。这种改性归因于表面粗糙度的增加，以及通过原子力显微镜、表面自由能和傅里叶变换红外光谱分析观察到的极性官能团的存在。研究进一步发现，经过DBD-CP处理后，PLA的耐水性和力学性能都得到了显著改善，这与PLA表面沉积壳聚糖的量呈正相关。综合评价后，确定75 W处理为提高性能的最佳条件。此外，改性膜对金黄色葡萄球菌具有较强的抗菌活性。因此，DBD-CP技术可以成为抗菌食品包装工业中更好地利用pla基材料的有前途的工具。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Journal of Food and Health

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