Faculty of Science and Technology, Tokyo University of Science.
Department of R&D Center, Ikeda Mohando Corporation Ltd.
J Oleo Sci. 2024;73(12):1467-1477. doi: 10.5650/jos.ess24181.
An effective approach to stabilize emulsions is to increase the rigidity of oil-water (O/W) interfacial films by adsorbing molecular assemblies such as lamellar phases around the emulsion particles. In this study, we aimed to analyze the structure of a lamellar phase adsorbed at an O/W interface and to clarify the effect of the structure and physicochemical properties of the lamellar phase on the dispersion stability of emulsions. The adsorption of the lamellar phase at the O/W interface of the emulsions was confirmed by freeze-fracture transmission electron microscopy of O/W emulsions prepared by diluting and dispersing gels formed with polyglycerol fatty acid esters, water, and cetyl isooctanoate (CIO). The structure of the lamellar phase adsorbed at the O/W interface was analyzed in detail through small-angle X-ray scattering measurement and indirect Fourier transform analysis. The lamellar phase adsorbed at the O/W interface was shown to have an interdigitated structure with low CIO content, whereas it changed to a non-interdigitated structure with increasing CIO content. Furthermore, the adsorbed lamellar phases with interdigitated structures and high rigidity provide the emulsion with higher dispersion stability.
一种有效的稳定乳液的方法是通过吸附层状相之类的分子组装体来增加油水（O/W）界面膜的刚性，从而围绕乳液颗粒。在这项研究中，我们旨在分析吸附在 O/W 界面上的层状相的结构，并阐明层状相的结构和物理化学性质对乳液分散稳定性的影响。通过稀释和分散由聚甘油脂肪酸酯、水和十六烷异辛酸酯（CIO）形成的凝胶制备的 O/W 乳液的冷冻断裂透射电子显微镜，证实了层状相在 O/W 界面的吸附。通过小角 X 射线散射测量和间接傅里叶变换分析，详细分析了吸附在 O/W 界面上的层状相的结构。结果表明，低 CIO 含量的层状相具有交错结构，而随着 CIO 含量的增加，层状相转变为非交错结构。此外，具有交错结构和高刚性的吸附层状相为乳液提供了更高的分散稳定性。
