Abstract
Integral enthalpies of dissolution Δsol H m of L-cysteine, L-serine, and L-asparagine in aqueous solutions of 1,3-propylene glycol at organic solvent concentrations of up to 0.26 mole fraction are measured via the thermochemistry of dissolution. Standard enthalpies of dissolution (Δsol H ○) and transfer (Δtr H ○) of amino acids from water to a mixed solvent are calculated. It is found that the calculated enthalpy coefficients of pair interactions of the amino acids with polyhydric alcohol molecules have positive values. The effect the arrangement of the hydroxyl group in the structure of polyhydric alcohols has on the enthalpy of interaction of amino acids in aqueous solutions is revealed. The effect of different types of interactions in solutions and the structural features of biomolecules and cosolvents on the enthalpy of dissolution of amino acids is analyzed.
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Original Russian Text © I.N. Mezhevoi, V.G. Badelin, 2015, published in Zhurnal Fizicheskoi Khimii, 2015, Vol. 89, No. 3, pp. 396–400.
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Mezhevoi, I.N., Badelin, V.G. Energetics of the molecular interactions of L-cysteine, L-serine, and L-asparagine in aqueous propylene glycol solutions at 298.15 K. Russ. J. Phys. Chem. 89, 393–397 (2015). https://doi.org/10.1134/S0036024415020168
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DOI: https://doi.org/10.1134/S0036024415020168