Research Institute for Marine Resources Utilization, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, 237-0061, Kanagawa, Japan.
Research Institute for Marine Resources Utilization, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, 237-0061, Kanagawa, Japan.
Carbohydr Polym. 2020 Dec 1;249:116843. doi: 10.1016/j.carbpol.2020.116843. Epub 2020 Aug 6.
Gum arabic (GA), an arabinogalactan-based gum, is a well-known powerful emulsifier. However, the poor stability of emulsion has often been pointed out. In order to clarify the origin, the structure-property relationship of GA, especially the interfacial property at oil/water interface, needs to be investigated. Here, we tried to correlate the primary structure with interfacial property at oil/water interface. A series of structural analyses by SEC-MALLS, SAXS, etc. showed that the primary structure of GA was a disk-like star shaped nanoparticle. The dynamic interfacial tension measurement showed that GA molecules adsorb onto oil surface in 2 steps: Firstly, the micron-aggregates of GA approach onto the oil surface, and then the aggregates are dissociated into nano-particles so that they cover the oil surface. Therefore, the emulsification and emulsion stability are controlled not by the property of the primary structure of GA but by the higher-order molecular network structure made of GA molecules.
阿拉伯胶（GA）是一种基于阿拉伯半乳聚糖的胶，是一种众所周知的强力乳化剂。然而，乳液的稳定性差的问题经常被指出。为了阐明其起源，需要研究 GA 的结构-性能关系，特别是在油/水界面的界面性质。在这里，我们试图将其一级结构与油/水界面的界面性质相关联。一系列 SEC-MALLS、SAXS 等结构分析表明，GA 的一级结构为盘状星形纳米颗粒。动态界面张力测量表明，GA 分子在 2 步中吸附在油表面上：首先，GA 的微米聚集体接近油表面，然后聚集体解离成纳米颗粒，从而覆盖油表面。因此，乳化和乳液稳定性不是由 GA 的一级结构的性质控制，而是由 GA 分子形成的更高阶的分子网络结构控制。
