Zhang Ni, Gao Chengcheng, Meng Linghan, Tang Xiaozhi
College of Food Science and Engineering, Collaborative Innovation Center for Modern Grain Circulation and Safety, Key Laboratory of Grains and Oils Quality Control and Processing, Nanjing University of Finance and Economics, Nanjing 210023, China.
College of Food Science and Engineering, Collaborative Innovation Center for Modern Grain Circulation and Safety, Key Laboratory of Grains and Oils Quality Control and Processing, Nanjing University of Finance and Economics, Nanjing 210023, China.
Carbohydr Polym. 2023 Nov 1;319:121224. doi: 10.1016/j.carbpol.2023.121224. Epub 2023 Jul 20.
To improve the hydrophobicity of polysaccharide-based films, hydrophobic carnauba wax-based particles were prepared by Pickering emulsion. The influence of the different size of the particles on the structure and hydrophobicity of the chitosan coating films were investigated. The results showed that micro-scale particles (average particle size 25.04 μm) with nano-scale (5-10 nm) TiO uniformly distributed on the surface of the particles were formed by Pickering emulsion. The chitosan coating films showed higher contact angle and lower sliding angle compared to the control due to the hierarchical structure, hydrophobicity and arrangement of the particles. In addition, the small particle (23-48 μm) coating film showed higher hydrophobicity than the large particle coating film (48-70 μm) due to the small particle size and the formation of more small gaps. The gaps were conducive to form "air cushion" which reduced the contact area between water and the coating films and thus increased contact angle and decreased sliding angle. The coating films showed high chemical stability and low residual rates of liquid food. The results suggest that Pickering emulsion is an effective method to create wax-based particles with hierarchical structure and the particles have potential to be used as hydrophobic coating materials.
为提高多糖基薄膜的疏水性，通过皮克林乳液制备了基于巴西棕榈蜡的疏水颗粒。研究了不同粒径颗粒对壳聚糖涂膜结构和疏水性的影响。结果表明，通过皮克林乳液形成了微米级颗粒（平均粒径25.04μm），其表面均匀分布着纳米级（5-10nm）的TiO。由于颗粒的分级结构、疏水性和排列方式，壳聚糖涂膜与对照相比表现出更高的接触角和更低的滑动角。此外，小颗粒（23-48μm）涂膜由于粒径小且形成了更多小间隙，其疏水性高于大颗粒涂膜（48-70μm）。这些间隙有利于形成“气垫”，减少水与涂膜之间的接触面积，从而增加接触角并减小滑动角。涂膜表现出高化学稳定性和低液态食品残留率。结果表明，皮克林乳液是制备具有分级结构的蜡基颗粒的有效方法，这些颗粒有潜力用作疏水涂层材料。
