Abstract
The enthalpies of dissolution of two dipeptides, DL-α-alanyl-β-alanine and β-alanyl-β-alanine, in mixed solvents H2O + acetone (AC) and H2O + dimethyl sulfoxide (DMSO) are measured via calorimetry at an organic component concentration of x 2 = 0–0.25 mole fraction at 298.15 K. The standard enthalpies of dissolution (Δsol H po) and the transfer (Δtr H po) of dipeptides from water to the mixed solvent and the enthalpic coefficients of pairwise interactions (h xy ) with AC and DMSO molecules are calculated from these data. The effect the composition of aqueous organic mixtures has on the enthalpy characteristics of the dissolution of DL-α-alanyl-β-alanine and β-alanyl-β-alanine is considered. A comparative analysis of h xy values is performed for alanine dipeptides in the investigated mixed solvents.
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Original Russian Text © V.I. Smirnov, V.G. Badelin, 2015, published in Zhurnal Fizicheskoi Khimii, 2015, Vol. 89, No. 8, pp. 1185–1189.
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Smirnov, V.I., Badelin, V.G. Dependence of the enthalpies of alanyl-alanine dissolution on the composition of mixed water + acetone and water + DMSO solvents at 298.15 K. Russ. J. Phys. Chem. 89, 1311–1315 (2015). https://doi.org/10.1134/S0036024415080294
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DOI: https://doi.org/10.1134/S0036024415080294