低温等离子体辅助聚乳酸表面接枝乳酸链球菌素 及抗菌性

该文主要通过低温等离子体处理聚乳酸薄膜，并研究了不同处理时间(0、15 s、30 s、45 s 和 60 s)后薄膜的表面形貌及亲水性。在此基础上，将低温等离子体处理后的聚乳酸薄膜浸泡到乳酸链球 菌素溶液中，对其抗菌性能进行测定。通过调节等离子体处理时间，可以明显改善聚乳酸薄膜的表面 亲水性及粗糙度。结果表明，随着处理时间的增加，聚乳酸薄膜表面粗糙度先增加后减小，接触角先 降低后增加。经过 60 s 低温等离子体处理的聚乳酸薄膜，浸泡乳酸链球菌素溶液进行接枝，可有效降 低单核增生李斯特菌的菌落总数。因此，低温等离子体处理聚乳酸薄膜，为其在食品抗菌包装领域提 供了一个非常好的思路。

Nisin-Coated Polylactic Acid Film Facilitated by Cold Plasma

The research focuses on the effect of cold plasma treatment on polylactic acid film with different time (0, 15 s, 30 s, 45 s and 60 s), to determine the film morphology and hydrophilicity. Based on that, the polylactic acid films treated with cold plasma were immersed in nisin solution, and the antimicrobial activity was evaluated. The results indicate that cold plasma time can significantly change the hydrophilicity and roughness of the film surface. Moreover, it is found that with the cold plasma time increases, the roughness firstly increases and then decreases, whereas, the water angle initially decreases and then increases. Furthermore, the polylactic acid films with 60 s cold plasma treatment present a better antimicrobial ability against Listeria monocytogenes. Herein, it is concluded that cold plasma treatment can improve the applicability of polylactic acid film in antimicrobial food packaging.