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

▸ κT values decrease with an increase in the molal concentration of amino acid/di-peptide in the electrolytic solutions as well as with an increase in temperature. ▸ κT values of amino acids/di-peptide reduce more in KCl solution than in KNO3 solution. ▸ Decrease in кT values with an increase in solute concentration is due to decrease in free volume and the average kinetic energy of constituents. ▸ Decease in кT values with an increase in temperature is due to the formation of more incompressible hydrated entities in solutions.