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Thermodynamic interaction between urea and the peptide group in aqueous solutions at 25°C

✍ Scribed by Hansjürgen Schönert; Leo Stroth

Publisher
Wiley (John Wiley & Sons)
Year
1981
Tongue
English
Weight
512 KB
Volume
20
Category
Article
ISSN
0006-3525

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✦ Synopsis

Abstract

Isopiestic vapor pressure measurements of the ternary systems water + triglycine + urea and water + glycine‐L‐alanine + urea were made and used to calculate the Gibbs free energy of these systems. Together with recently published analogous results on systems, in which the first solute was glycine or alanine or diglycine, and measurements of the excess enthalpy of all these solutions, it is possible to calculate the Gibbs free energy of transfer and the enthalpy of transfer of the peptide group from water to aqueous urea solutions. The transfer can be described as a binding of urea to the peptide group with Δ__G__ = −1.85 kJ mol^−1^ and Δ__H__ = −18.7 kJ mol^−1^ at 298.1 K.

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