Interactions of amino acids in aqueous triammonium citrate solutions at different temperatures: A viscometric approach

Abstract

The viscosities, η of glycine (Gly), l-alanine (Ala), and l-valine (Val) with triammonium citrate have been measured as a function of temperature at T=(288.15, 298.15, 308.15 and 318.15) K. The change in viscosity of amino acids with increase in triammonium citrate concentration and temperature is attributed to amino acid–triammonium citrate interactions. The viscosity B-coefficients and viscosity interaction parameters obtained from the Jones–Dole equation and transition state theory respectively have been discussed to interpret interactions between ions of amino acids and triammonium citrate. Further, enthalpy of viscous flow and entropy of viscous flow have been determined.