The enthalpies of interactions of some L-α-amino acids with urea molecule in aqueous solutions at 298.15 K
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Dissolution enthalpies of L-α-aminobutyric acid, L-α-isoleucine, L-α-phenylalanine, L-α-methionine, L-α-serine, L-α-threonine, L-α-cysteine, L-α-asparagine and L-α-glutamine in aqueous solutions of urea have been measured by calorimetry at 298.15 K. The obtained results were used to calculate the enthalpic interaction coefficients between the zwitterions of the L-α-amino acids and a molecule of urea in water. These values were interpreted in terms of the hydrophobic or hydrophilic effects of the side chains of amino acids on their interactions with a polar molecule of urea in water.
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