Effect of Temperature on the Surface Properties of Aqueous Solution of Arachidonic Acid

概要

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The surface tension of aqueous solution of arachidonic acid (AA) was measured with a Du Nouy tensiometer at pH 7.80 and various temperatures, and the effect of temperature on the surface properties of AA was investigated. The value of critical micelle concentration (cmc) of AA increased and the surface tension at the cmc, γ_<cmc>, decreased as the temperature was raised from 30 to 60℃. The Langmuir constant k concerning the strength of adsorption decreased, the saturated adsorption ammount of AA, Γ_∞, at the air-water interface decreased, and the area occupied by an AA molecule at the saturated adsorption, A_∞, increased as the temperature was raised. The standard free energy for the adsorption, ΔG_<ad>, was of negative value, and the absolute value |ΔG_<ad>| became larger as the temperature was raised because of the negative value of the standard enthalpy change ΔH_<ad> and the positive value of the standard entropy change ΔS_<ad>. The standard free energy of micellization, ΔG_m, was of negative value, and it was similarly found that |ΔG_m|became larger as the temperature was raised because of the negative value of the standard enthalpy change ΔH_m and the positive value of the standard entropy change ΔS_m.
公益社団法人日本薬学会の論文
1993-01-15