Antimicrobial activity of nisin‐coated polylactic acid film facilitated by cold plasma treatment

作者：Shouyun Hu, Penghui Li, Zhangqian Wei, Jinfen Wang, H. Wang, Zhe Wang · 发表于：Journal of Applied Polymer Science · 年份：2018 · DOI：10.1002/app.46844 · 被引用次数：36 · 研究领域：biodegradable polymer synthesis and properties、Additive Manufacturing and 3D Printing Technologies、Microplastics and Plastic Pollution

ABSTRACT In this investigation, the surface functionalization of polylactic acid (PLA) film has been carried out by cold plasma treatment (CPT) to facilitate the coating of nisin on its surface. The physical and chemical properties of PLA films, such as surface morphology, water contact angle (WCA), chemical structure, and dynamic mechanical thermal properties, after CPT were systematically investigated. The obtained results demonstrated that the oxygen/carbon (O/C) ratio of PLA films decreased from 0.46 to 0.40 with an increase in the time of CPT. As the time of CPT increased, the roughness at first increased to 6.24 nm for PLA30, but then decreased to 2.26 nm for PLA60, whereas WCA at first decreased to 51.06° but then increased to 75°. Attenuated total reflectance Fourier transform infrared spectroscopy confirmed the successful coating of nisin onto PLA films with CPT. As compared with the PLA film, PN60 decreased the total viable count of Listeria monocytogenes to 2.25 log 10 [CFU/mL]. The different antimicrobial abilities against L. monocytogenes indicated that CPT could affect the adsorption capacity of PLA surface. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46844.