JNU-UPM International Joint Laboratory on Plant Oil Processing and Safety, Department of Food Science and Engineering, Jinan University, Guangzhou 510632, China.
Guangdong International Joint Research Center for Oilseed Biorefinery, Nutrition and Safety, Guangzhou 510632, China.
Food Funct. 2021 Nov 29;12(23):11732-11746. doi: 10.1039/d1fo01883c.
Pickering water-in-oil (W/O) emulsions were fabricated by using medium-long chain diacylglycerol (MLCD)-based solid lipid nanoparticles (SLNs) and the connection between the characteristics of the SLNs and the colloidal stability of the emulsions was established. melt-emulsification and ultrasonication, MLCD-based SLNs with particle sizes of 120-300 nm were obtained with or without other surfactants. The particle size of the SLNs was influenced by the chemical properties of the surfactants, and surfactants decreased the contact angle of SLNs at the oil-water interface. Gelation was observed in SLNs modified by sodium stearoyl lactylate and lecithin, whereas the addition of Tween 20 resulted in a homogeneous SLN solution. The adsorption of surfactants onto SLN surfaces caused the production of higher amounts of α crystals accompanied by delayed crystallization onset which contributed to the reduction of particle size, interfacial tension and oil wetting ability. The W/O emulsions with higher rigidity and physical stability can be obtained by varying surfactant types and by increasing SLN mass ratios to 60%, whereby more SLNs are adsorbed at the droplet surface as a Pickering stabilizer. This study provides useful insights for the development of diacylglycerol-based SLNs and Pickering W/O emulsions which have great potential for food, cosmetic and pharmaceutical applications.
采用中长链二酰基甘油（MLCD）基固体脂质纳米粒（SLN）制备了 Pickering 水包油（W/O）乳液，并建立了 SLN 特性与乳液胶体稳定性之间的关系。通过熔融乳化和超声处理，获得了粒径为 120-300nm 的 MLCD 基 SLN，有无其他表面活性剂均可。表面活性剂的化学性质影响 SLN 的粒径，并且表面活性剂降低了 SLN 在油水界面的接触角。硬脂酰乳酸钠和卵磷脂改性的 SLN 发生凝胶化，而添加 Tween 20 则导致 SLN 溶液均匀。表面活性剂吸附在 SLN 表面上导致产生更多的α晶，同时结晶起始延迟，这有助于减小粒径、界面张力和油润湿能力。通过改变表面活性剂类型和将 SLN 质量比增加到 60%，可以获得刚性和物理稳定性更高的 W/O 乳液，其中更多的 SLN 作为 Pickering 稳定剂吸附在液滴表面。本研究为开发基于二酰基甘油的 SLN 和 Pickering W/O 乳液提供了有用的见解，这些乳液在食品、化妆品和制药应用方面具有很大的潜力。
