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Enthalpy characteristics of the dissolution of L-valine in water/formamide mixtures at 298.15 K

  • Physical Chemistry of Solutions
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Abstract

The thermochemical dissolution of L-valine in solvent mixtures H2O + (formamide, N-methylformamide, and N,N-dimethylformamide) is studied at an organic component concentration of x 2 = 0–0.35 molar fractions and a temperature of 298.15 K. The experimental data are used to calculate standard enthalpies of dissolution, the transferring of L-valine from water to a mixed solvent, and the enthalpy coefficients of pairwise interactions (h xy ) with organic solvent molecules. The correlation between the enthalpy characteristics of the dissolution of L-valine with the composition of aqueous organic mixtures and the nature of the organic solvent (its physicochemical properties) is determined. A comparative analysis of the values of h xy of a number of aliphatic L-amino acids in similar solvent mixtures with the hydrophobicity parameters of their side chains is performed.

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Correspondence to V. I. Smirnov.

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Original Russian Text © V.I. Smirnov, V.G. Badelin, 2016, published in Zhurnal Fizicheskoi Khimii, 2016, Vol. 90, No. 11, pp. 1643–1648.

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Smirnov, V.I., Badelin, V.G. Enthalpy characteristics of the dissolution of L-valine in water/formamide mixtures at 298.15 K. Russ. J. Phys. Chem. 90, 2165–2169 (2016). https://doi.org/10.1134/S0036024416110261

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