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Thermodynamics of Protolytic Equilibria in Aqueous Solutions of Biologically Active Ligands

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Abstract

The protolytic equilibria in aqueous solutions of different amino acids and dipeptides were studied by a direct calorimetric method at 288–328 K. The measurements were made with an isothermal-shell calorimeter with automatic temperature recording. The thermodynamic characteristics of the processes of acid-base equilibria were found from the combined results of thermochemical measurements and equilibrium constant data. Gurney concepts were used to analyse the thermodynamic characteristics of reactions. Comparisons of the temperature-dependent and temperature-independent contributions to the Gibbs energy and enthalpy change afford the criteria of the variability in sign of the ΔH of the process, i.e. they allow prediction of the magnitude of the temperature θ at which ΔH = 0.

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Authors and Affiliations

  1. State Chemistry and Technology Academy, Engels 7, 153460, Ivanovo, Russia

    V. P. Vasil‘ev, L. A. Kochergina & G. G. Gorboletova

Authors
  1. V. P. Vasil‘ev
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  2. L. A. Kochergina
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  3. G. G. Gorboletova
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Vasil‘ev, V.P., Kochergina, L.A. & Gorboletova, G.G. Thermodynamics of Protolytic Equilibria in Aqueous Solutions of Biologically Active Ligands. Journal of Thermal Analysis and Calorimetry 54, 311–315 (1998). https://doi.org/10.1023/A:1010122531063

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  • DOI: https://doi.org/10.1023/A:1010122531063

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