Surface Potential of Mixed Micelles Composed of Dibucaine Hydrochloride and Heptaethylene Glycol Dodecyl Ether
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概要
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The surface potential (Δψ) of the mixed micelles composed of dibucaine hydrochloride (DC) and nonionic heptaethylene glycol dodecyl ether (HED) has been estimated by measuring the fluorescence intensity of ammonium 8-anilino-1-naphthalenesulfonate (ANS) as a fluorescent probe. The value of +Δψ increases with an increasing mole fraction of DC (X_<DC>) and decreases with increasing ionic strength (I). These changes are due to the effects of the ositive charge of DC and of the ionic atmosphere of Cl^-, respectively. Surface charge density (σ) was, therefore, determined from Δψ according to the Gouy-Chapman theory, with a results that σ is nearly independent of I and proportional to X_<DC>. These results have led to a conclusion that the state of the diffuse layer surrounding the Stern layer at the micelle surface is represented well by the Gouy-Chapman theory.
- 公益社団法人日本薬学会の論文
- 1997-12-15
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