Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465, Porto, Portugal.
Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Polytechnic Institute of Bragança, Campus Santa Apolónia, 5301-253, Bragança, Portugal; Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253 Bragança, Portugal.
Carbohydr Polym. 2019 Nov 15;224:115190. doi: 10.1016/j.carbpol.2019.115190. Epub 2019 Aug 12.
Recently, there has been a renewed interest in Pickering emulsions owing to their surfactant-free nature, and the use of natural-based particles as stabilizers became a priority due to the applications they can enable. In this work, chitosan/gum Arabic (CH/GA) nanoparticles were synthesized and tested as novel stabilizers. Among the tested CH/GA weight ratios, the particles prepared using 1:1 ratio exhibited near-neutral wettability, an average size of 108.6 nm and a zeta potential of 56.3 mv. Pickering emulsions prepared from these particle dispersions (1.5% w/v), and high oil volume fractions (φ = 0.6, 0.7), have shown high storage stability. Moreover, confocal laser scanning microscopy confirmed the o/w type and the effective adsorption of the nanoparticles at the oil/water interface forming a barrier against droplets coalescence. The emulsions have shown shear-thinning and elastic-like behavior. These findings open new avenues for using these emulsions as novel delivery systems, e.g. in cosmetic and food applications.
最近，由于 Pickering 乳液的无表面活性剂特性，人们对其重新产生了兴趣，并且由于它们能够实现的应用，使用基于天然的颗粒作为稳定剂成为了优先事项。在这项工作中，壳聚糖/阿拉伯胶（CH/GA）纳米颗粒被合成并测试为新型稳定剂。在测试的 CH/GA 重量比中，使用 1:1 比例制备的颗粒表现出近中性润湿性、平均尺寸为 108.6nm 和 56.3mv 的 ζ 电位。由这些颗粒分散体（1.5%w/v）和高油体积分数（φ=0.6、0.7）制备的 Pickering 乳液具有高储存稳定性。此外，共焦激光扫描显微镜证实了 o/w 型和纳米颗粒在油/水界面的有效吸附，形成了防止液滴聚结的屏障。乳液表现出剪切稀化和弹性样行为。这些发现为将这些乳液用作新型递送系统开辟了新途径，例如在化妆品和食品应用中。
