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Enthalpic characteristics of solution of amino acids and aliphatic dipeptides in aqueous solutions of KCl

  • Chemical Thermodynamics and Thermochemistry
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Abstract

The integral enthalpies of dissolution Δsol H m of L-α-serine and L-α-asparagine in mixtures of water with KCl were measured in electrolyte concentrations of up to 4 mol/kg at 298.15 K. The standard enthalpies of dissolution (Δsol H o) and transfer (Δtr H o) of amino acids from water to aqueous solutions of KCl were calculated. The enthalpic pair interaction coefficients h xy of biomolecules with KCl were estimated within the McMillan-Mayer theory. The changing nature of the interaction between the components of the solution (depending on the structure of the dissolved biosubstance side substituents) is shown on the basis of data we obtained earlier for amino acids and dipeptides series. Estimates of the contributions from the electrostatic and other interactions of dipolar ions of amino acids and dipeptides with ions of electrolyte KCl in the enthalpic pair interaction coefficients h xy are obtained using the Kirkwood approach.

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Authors and Affiliations

  1. Institute of Solution Chemistry, Russian Academy of Sciences, Ivanovo, 153045, Russia

    V. G. Badelin, I. N. Mezhevoi & E. Yu. Tyunina

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  1. V. G. Badelin
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  2. I. N. Mezhevoi
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  3. E. Yu. Tyunina
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Correspondence to V. G. Badelin.

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Original Russian Text © V.G. Badelin, I.N. Mezhevoi, E.Yu. Tyunina, 2010, published in Zhurnal Fizicheskoi Khimii, 2010, Vol. 84, No. 11, pp. 2042–2047.

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Badelin, V.G., Mezhevoi, I.N. & Tyunina, E.Y. Enthalpic characteristics of solution of amino acids and aliphatic dipeptides in aqueous solutions of KCl. Russ. J. Phys. Chem. 84, 1862–1866 (2010). https://doi.org/10.1134/S0036024410110075

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