BACKGROUND To improve the physicochemical and antibacterial properties of the coatings, the CS coatings were respectively prepared by casting method with ZnO and Ag/ZnO microspheres as modifiers. The chemical structures and micromorphology of ZnO, Ag/ZnO microspheres and CS coatings were characterized by X-ray diffraction, Fourier Transform infrared spectroscopy, scanning electron microscope, transmission electron microscope and Energy dispersive X-ray spectroscopy. Furthermore, using the dominant spoilage bacteria of aquatic products, Shewanella putrefaciens and Pseudomonas aeruginosa, as objects, the antibacterial activities and mechanism of the CS coatings were investigated. RESULTS The results show that ZnO and Ag/ZnO microspheres are dispersed homogeneously in the CS coatings. After modified by ZnO and Ag/ZnO microspheres, the mechanical properties and antibacterial abilities of the CS coatings are improved, and that of 0.5% Ag/ZnO-CS coating is the optimal. For pure CS coating, the bacterial cell membrane is damaged slightly because of the electrostatic interaction between NH3+ of CS and the negative charge on bacterial surface. After treated by ZnO-CS composite coating, the bacterial cell membrane is destroyed badly on account of the above-mentioned ion interaction and disturbing the synthesis of high molecular weight total protein. CONCLUSION With regard to Ag/ZnO-CS composite coating, the bacterial cell membrane is damaged seriously and cell contents are completely released due to ion interaction, disturbing the synthesis of high molecular weight total protein and low molecular weight membrane protein. Hence, Ag/ZnO-CS composite coatings are antimicrobial materials and food preservative materials with great potential application. This article is protected by copyright. All rights reserved.

中文翻译：

---

Ag/ZnO微球改性壳聚糖涂层的制备、表征及抗菌机理

背景技术为了提高涂层的理化和抗菌性能，以ZnO和Ag/ZnO微球为改性剂，分别采用浇铸法制备了CS涂层。通过X射线衍射、傅里叶变换红外光谱、扫描电子显微镜、透射电子显微镜和能量色散X射线光谱对ZnO、Ag/ZnO微球和CS涂层的化学结构和微观形貌进行了表征。此外，以水产品中的主要腐败菌，腐败希瓦氏菌和铜绿假单胞菌为对象，研究了CS涂层的抗菌活性和机理。结果 结果表明，ZnO 和Ag/ZnO 微球均匀地分散在CS 涂层中。经ZnO和Ag/ZnO微球修饰后，CS涂层的力学性能和抗菌能力得到改善，其中0.5% Ag/ZnO-CS涂层的性能最佳。对于纯 CS 涂层，由于 CS 的 NH3+ 与细菌表面负电荷之间的静电相互作用，细菌细胞膜受到轻微破坏。经ZnO-CS复合涂层处理后，细菌细胞膜因上述离子相互作用而受到严重破坏，干扰高分子量总蛋白的合成。结论Ag/ZnO-CS复合涂层由于离子相互作用严重破坏细菌细胞膜，细胞内容物完全释放，干扰高分子量总蛋白和低分子量膜蛋白的合成。因此，Ag/ZnO-CS复合涂层是具有巨大应用潜力的抗菌材料和食品保鲜材料。本文受版权保护。版权所有。