Amino Acids

, Volume 27, Issue 3–4, pp 299–303 | Cite as

The enthalpies of interactions of some L-α-amino acids with urea molecule in aqueous solutions at 298.15 K

  • B. Pałecz


Dissolution enthalpies of L-α-aminobutyric acid, L-α-isoleucine, L-α-phenylalanine, L-α-methionine, L-α-serine, L-α-threonine, L-α-cysteine, L-α-asparagine and L-α-glutamine in aqueous solutions of urea have been measured by calorimetry at 298.15 K. The obtained results were used to calculate the enthalpic interaction coefficients between the zwitterions of the L-α-amino acids and a molecule of urea in water. These values were interpreted in terms of the hydrophobic or hydrophilic effects of the side chains of amino acids on their interactions with a polar molecule of urea in water.

Keywords: L-α-amino acids – Enthalpies of solution – Aqueous solutions of urea 


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Copyright information

© Springer-Verlag/Wien 2004

Authors and Affiliations

  • B. Pałecz
    • 1
  1. 1.Department of Physical ChemistryUniversity of ŁódźPomorska, ŁódźPoland

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