Thermodynamic and structural aspects of the interaction of l-histidine with urea and dimethylformamide in water |
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| Authors: | A V Kustov A V Bekeneva V P Korolev |
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| Institution: | (1) Institute of Solution Chemistry, Russian Academy of Sciences, ul. Akademicheskaya 1, Ivanovo, 153045, Russia;(2) Ivanovo State University of Chemical Technology, Ivanovo, Russia |
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| Abstract: | The solubility of l-histidine in water and aqueous solutions of dimethylformamide (DMF) at 25°C was determined. The thermal effects of solution of l-histidine in aqueous solutions of urea and DMF were measured. The standard enthalpies, free energies, and entropies of solution and transfer of the amino acid from water to aqueous solutions of amides were calculated. It was shown that the interaction of l-histidine with urea is attractive, and that with DMF, repulsive, with the change in the free energy determined by the enthalpy term in both cases. The enthalpy-entropy compensation taking place to a certain extent in the interaction of l-histidine and l-phenylalanine with amide was revealed. This effect is the most pronounced in the interaction of predominantly hydrophobic DMF and l-phenylalanine. |
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