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Interactions between several l-α-amino acids and potassium chloride in aqueous solutions at 298.15 K

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Abstract

The enthalpies of solution of l-α-aminobutyric acid, l-α-valine, l-α-leucine, l-α-isoleucine, and l-α-cysteine have been measured in aqueous potassium chloride solutions at 298.15 K. From the obtained experimental results the standard dissolution enthalpies of amino acids in aqueous KCl solutions have been determined. These data were used to calculate the heterogeneous enthalpic pair interaction coefficients based on McMillan–Mayer’s theory. These values were interpreted in the terms of the hydrophobic or hydrophilic effects of the side chains of amino acids on their interactions with dissociated potassium chloride in water.

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Abbreviations

h AE :

The heterogeneous enthalpic pair interaction coefficient between zwitterions of amino acids and dissociated potassium chloride

h AEE :

The enthalpic triplet interaction coefficient

\( \Updelta_{\rm sol} {\text{H}}_{\rm m}^{\infty } \left(\hbox{W} \right) \) :

Standard solution enthalpies of l-α-amino acids in water

\( \Updelta_{\text{sol}} H_{\text{m}}^{\infty } \left( {{\text{W}} + {\text{E}}} \right) \) :

Standard enthalpies of solution of the l-α-amino acids in aqueous solutions of potassium chloride (E)

m E :

Molal concentration of KCl in water (mol kg−1)

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Authors and Affiliations

  1. Department of Physical Chemistry, University of Lodz, 90-416, Lodz, Poland

    Bartlomiej Palecz & Joanna Dunal

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  1. Bartlomiej Palecz
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  2. Joanna Dunal
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Correspondence to Bartlomiej Palecz.

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Palecz, B., Dunal, J. Interactions between several l-α-amino acids and potassium chloride in aqueous solutions at 298.15 K. J Therm Anal Calorim 104, 789–793 (2011). https://doi.org/10.1007/s10973-010-1151-8

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  • DOI: https://doi.org/10.1007/s10973-010-1151-8

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