Morphology of polysorbate 80 (Tween 80) micelles in aqueous 1,4-dioxane solutions

被引:36
作者
Aizawa, Hideki [1 ]
机构
[1] Setsunan Univ, Fac Pharmaceut Sci, Dept Pharmaceut Phys Chem, Osaka 5730101, Japan
关键词
X-RAY-SCATTERING; ETHYLENE-GLYCOL; IONIC SURFACTANTS; WATER SUBSTITUTE; POLAR-SOLVENTS; FORMAMIDE; MICROEMULSIONS; GLYCEROL; SYSTEMS; AGGREGATION;
D O I
10.1107/S002188980902295X
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The structures of micelles of the surfactant polysorbate 80 (Tween 80) in 0-50% aqueous 1,4-dioxane solutions (pH 7.2, ionic strength 2.44 mM) were investigated by means of small-angle X-ray scattering. At 1,4-dioxane concentrations of 0-20%, core-shell cylindrical micelles formed because the crown-shaped polysorbate 80 molecules aggregated into a cylindrical layer of four chains entangled with one another through intra- and intermolecular interactions. At 30-40% 1,4-dioxane, core-shell discus micelles formed, and at 50% 1,4-dioxane, core-shell elliptic discus micelles formed by the same mechanism. By changing the 1,4-dioxane solvent concentration and increasing the solvent hydrophobicity, the micelles first change from core-shell cylindrical to core-shell discus and then from core-shell discus to core-shell elliptic discus micelles.
引用
收藏
页码:592 / 596
页数:5
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