非イオン性界面活性剤による香料の可溶化に関する研究

抄録

Author studied the states of dissolution in the ternary system consisting of polyoxyethylene nonylphenyl ether different in the degree of ethylene oxide polymerization, essential oil different in polarity, and water.
When such ternary system is heated starting from turbid heterogeneous phase, it turns into transparent homogeneous phase then reaches again claud point on further heating. Author obtained diagrams of dissolution states of the system by the measurement of transparent point and claud point and the plotted curves deviled the diagram into three regions; the first heterogeneous phase system above the claud point curve; the second homogeneous (solubilized) phase system; and the third heterogeneous phase system below the transparent point curve. From the diagram, minimum concentration of each surfactant required (required concentration) for the solubilization of each essential oil at any temperature was obtained, and it showed a smallest value in the system of the intermediate n (degree of polymerization of ethyleneoxide) which is the optimum solubilizer. n, HLB and the required concentration of the optimum solubilizer between 0 and 40 can be easily found from the diagram.
Optimum value of HLB obtained increased with increase of the polarity of essential oil.
Effect of ethanol addition to the ternary system was also discussed.