Interactions in l-histidine/l-glutamic acid/l-tryptophan/glycylglycine +2 mol L-1 aqueous KCl/KNO3 systems at different temperatures: An isothermal compressibility study

Abstract

10.1016/j.tca.2012.06.006Measured values of ultrasonic velocity and density have been used to calculate the isothermal compressibilities (? T) of l-histidine/l-glutamic acid/l-tryptophan/glycylglycine + 2 mol L -1 aqueous KCl/KNO 3 systems as a function of amino acid/di-peptide molal concentration and at temperatures in the range of 298.15-323.15 K. The trends of variations of ? T, on successive addition of amino acid/di-peptide amount to solutions and on increase in temperature have been discussed in terms of solute-solute and solute-solvent interactions operative in the studied systems as well as difference in interactions with KCl/KNO 3 at same concentration have been show