Department of Food and Bioengineering, Guangdong Industry Polytechnic, Guangzhou, Guangdong 510300, People's Republic of China.
School of Pharmaceutical Sciences, Guangzhou Medical University, Guangzhou, Guangdong 511436, People's Republic of China.
J Colloid Interface Sci. 2018 Jan 1;509:360-368. doi: 10.1016/j.jcis.2017.08.091. Epub 2017 Aug 31.
Controlled demulsification was used to tailor the release of NaCl as a solute from water-in-oil (W/O) emulsion droplets encased in glycerol monostearate (GMS) crystalline shells. Under quiescent conditions at room temperature, the GMS shells behaved as an effective barrier against salt diffusion. A second surfactant, sorbitan monooleate (SMO), added to the emulsion post-preparation to controllably demulsify, resulted in concentration-dependent removal of the interfacially-bound GMS crystals resulting in aqueous droplet coalescence. As a result, NaCl was released from the now-unstable emulsions. Mechanistically, the SMO and GMS demonstrated competitive adsorption for the oil-water interface, with the SMO significantly reducing the displacement energy of the interfacially-bound GMS. Overall, secondary surfactant addition to Pickering emulsions was shown to have important implications for tailoring interfacial composition, and by extension, modulation of the release of solutes from fat crystal-stabilized W/O Pickering emulsions.
采用可控破乳的方法来调整 NaCl 作为溶质从甘油单硬脂酸酯 (GMS) 晶型壳包裹的油包水 (W/O) 乳液滴中的释放。在室温下的静止条件下，GMS 壳作为盐扩散的有效屏障。在乳液制备后加入第二种表面活性剂山梨醇单油酸酯 (SMO) 可控地破乳，导致界面结合的 GMS 晶体浓度依赖性去除，从而导致水相液滴聚结。结果，NaCl 从现在不稳定的乳液中释放出来。从机理上讲，SMO 和 GMS 表现出对油水界面的竞争吸附，其中 SMO 显著降低了界面结合的 GMS 的置换能。总的来说，向 Pickering 乳液中添加二次表面活性剂对调整界面组成具有重要意义，并且可以扩展到从脂肪晶体稳定的 W/O Pickering 乳液中调节溶质的释放。
