Abstract Chitosan (CH) films at 4.4 kDa with different deacetylation degree (DD, 81.0, 88.1 and 95.2%) and concentration (0.9, 1.2 and 1.5%) were prepared using electrostatic spraying (ES) system. The effects of DD and concentration on film-forming solution properties, ES-atomization effects, and film performances were investigated. Results indicated that surface tension and viscosity of CH solution declined with the increase of DD, while solution conductivity displayed the opposite trend. The spray angles of film-forming solution during ES were in the range of 10.6–14.2°, and the average median diameters of droplet sizes were all ranged from 6.4 to 13.9 μm. The spray angle and droplet size generally reduced with increasing DD, and thus more complete, rougher and more crystalline microstructures of CH films were observed by SEM, AFM and XRD. CH films at 88.1 and 95.2% DD had better water barrier property and tensile strength. In addition, antibacterial capacities of CH films against L.innocua and E. coli were enhanced with DD. The results could provide guidance on the application of ES technology to improve the commercial food safety such as, fruits, vegetables, poultry, meat, and seafood.

中文翻译：

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静电喷涂脱乙酰度对壳聚糖膜性能的影响

摘要 采用静电喷涂（ES）系统制备了4.4 kDa、不同脱乙酰度（DD，81.0、88.1和95.2%）和浓度（0.9、1.2和1.5%）的壳聚糖（CH）薄膜。研究了 DD 和浓度对成膜溶液性质、ES 雾化效果和薄膜性能的影响。结果表明，CH溶液的表面张力和粘度随着DD的增加而下降，而溶液电导率则呈相反趋势。ES期间成膜溶液的喷射角度在10.6-14.2°范围内，液滴尺寸的平均中值直径均在6.4-13.9μm范围内。喷射角和液滴尺寸通常随着DD的增加而减小，因此通过SEM、AFM和XRD观察到CH薄膜的更完整、更粗糙和更结晶的微观结构。88.1%和95.2% DD的CH薄膜具有更好的阻水性能和拉伸强度。此外，DD 增强了 CH 膜对 L.innocua 和大肠杆菌的抗菌能力。研究结果可为应用 ES 技术提高水果、蔬菜、家禽、肉类和海鲜等商业食品安全提供指导。