This study focused on the development of a new biopolymer coating with antifogging and antimicrobial properties. The dual functional coatings, which consisted of multiple layers of chitosan (CS) and alginate dialdehyde (ADA), were prepared by layer-by-layer assembly driven by Schiff base, hydrogen bonding, and electrostatic interactions. Fourier transform-infrared spectroscopy indicated the formation of a Schiff base between CS and ADA. The six-layer coating had high transparency, optimum hydrophilicity and antifogging property as characterized by spectroscopy, water contact angle analysis and antifogging testing. The antibacterial activity of the six-layer coating was better than that of CS alone. Furthermore, the six-layer coating reduced decay of fresh-cut lettuce during storage. The results from this study suggest that coatings consisting of CS and ADA can prevent fogging, inhibit microbial growth, and maintain the quality of fresh produce throughout storage.

这项研究的重点是开发一种新型的具有防雾和抗菌特性的生物聚合物涂层。该双功能涂料由壳聚糖（CS）和藻酸盐二醛（ADA）的多层组成，是通过席夫碱，氢键和静电相互作用驱动的逐层组装制备的。傅里叶变换红外光谱表明在CS和ADA之间形成了席夫碱。该六层涂层具有高透明度，最佳的亲水性和防雾性能，通过光谱学，水接触角分析和防雾测试来表征。六层涂层的抗菌活性优于单独使用CS的抗菌活性。此外，六层涂层减少了鲜切生菜在储存过程中的腐烂。