The enthalpies of interactions of some L-alpha-amino acids with urea molecule in aqueous solutions at 298.15 K.
Dissolution enthalpies of L-alpha-aminobutyric acid, L-alpha-isoleucine, L-alpha-phenylalanine, L-alpha-methionine, L-alpha-serine, L-alpha-threonine, L-alpha-cysteine, L-alpha-asparagine and L-alpha-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-alpha-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.
Pałecz
B
B
Department of Physical Chemistry, University of Łódź, Pomorska, Łódź, Poland. paleczb@uni.lodz.pl
D000596:Amino Acids / Q000737:chemistry*; D012996:Solutions; D014508:Urea / Q000737:chemistry*; D014867:Water
D000596:Amino Acids; D012996:Solutions; D014867:Water; D014508:Urea