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Calorimetric studies of interactions of some peptides with electrolytes, urea and ethanol in water at 298.15 K

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Abstract

The standard molar enthalpies of solution at infinite dilution \( \Updelta_{\text{sol}} H_{\text{m}}^{\infty } \) of glycylglycine, dl-alanyl-dl-alanine and glycylglycylglycine in aqueous solutions of potassium chloride and ethanol as well as of glycylglycine and glycylglycylglycine in the solutions containing urea and water have been determined by calorimetry at the temperature 298.15 K. Changes of solution enthalpy, expressed in a form so-called heterotactic interaction coefficients, \( h_{\text{xy}} \) were used for analysis of interactions occurring between the investigated solutes in water. The group contributions illustrating the interactions of KCl, urea and ethanol with selected functional groups in the peptide molecules, namely CH2, “pep,” and “ion” groups, were calculated and discussed.

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Authors and Affiliations

  1. Department of Physical Chemistry, University of Łódź, Pomorska 165, 90-236, Łódź, Poland

    Henryk Piekarski & Bożenna Nowicka

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  1. Henryk Piekarski
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  2. Bożenna Nowicka
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Correspondence to Henryk Piekarski.

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Piekarski, H., Nowicka, B. Calorimetric studies of interactions of some peptides with electrolytes, urea and ethanol in water at 298.15 K. J Therm Anal Calorim 102, 31–36 (2010). https://doi.org/10.1007/s10973-009-0547-9

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  • DOI: https://doi.org/10.1007/s10973-009-0547-9

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