The solubilization of poorly water-soluble progesterone derivatives into micelles of a gemini surfactant was investigated in an aqueous medium. The aqueous solubility at different temperatures was determined spectroscopically using an ultraviolet visible light spectrophotometer. Thermodynamic parameters for the solubilization were calculated under the basis of the solubility change against temperature. The solubility of progesterone was quite low and remained constant below the critical micelle concentration (cmc) of the surfactant. On the other hand, the solubility increased considerably with increasing surfactant concentration above the cmc. It was suggested that the solubilizates were located in the vicinity of polar regions of micelles.
机构:
Daiichi Univ Pharm, Fac Pharmaceut Sci, Dept Ind Pharm, 22-1 Tamagawa Cho,Minami Ku, Fukuoka 8158511, JapanDaiichi Univ Pharm, Fac Pharmaceut Sci, Dept Ind Pharm, 22-1 Tamagawa Cho,Minami Ku, Fukuoka 8158511, Japan
Nakahara, Hiromichi
Koga, Kazutaka
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Daiichi Univ Pharm, Fac Pharmaceut Sci, Dept Kampo Pharm, 22-1 Tamagawa Cho,Minami Ku, Fukuoka 8158511, JapanDaiichi Univ Pharm, Fac Pharmaceut Sci, Dept Ind Pharm, 22-1 Tamagawa Cho,Minami Ku, Fukuoka 8158511, Japan
Koga, Kazutaka
Matsuoka, Keisuke
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Saitama Univ, Fac Educ, Lab Chem, 255 Shimo Okubo,Sakura Ku, Saitama, Saitama 3388570, JapanDaiichi Univ Pharm, Fac Pharmaceut Sci, Dept Ind Pharm, 22-1 Tamagawa Cho,Minami Ku, Fukuoka 8158511, Japan