Activity Coefficients for the System Glycylglycine–Urea–Water

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概要

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• Activity coefficients for the ternary system glycylglycine-urea-water were measured by the isopiestic vapor pressure method at 25°C. The activity coefficients of glycylglycine were lowered by urea. The lowering increased with increasing concentration of urea and with decreasing concentration of the amino acid. It was dependent on amino acid concentration to a greater extent than in the system α-amino-<I>n</I>-butyric acid–urea–water. The activity coefficients of urea were also decreased by glycylglycine. The free energy of the transfer of glycylglycine from water to urea solutions in various concentrations was calculated. The values obtained were combined with enthalpy data to yield −3.9 e. u. as the entropy value for the transfer from water to 6 M urea solution. Results have been interpreted to support the existence of interaction between urea and glycylglycine.

• 公益社団法人 日本化学会の論文

著者

• Uedaira Hatsuho

  Research Institute for Polymeres and Textiles

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