Physicochemical study of solute–solute and solute–solvent interactions of l-histidine in water + sucrose solutions at different temperatures

Abstract

Densities, ρ, ultrasonic speeds, u, and viscosities, η of solutions of l-histidine in aqueous-sucrose solvents (5, 10, 15 and 20% of sucrose, w/w in water) were measured at 293.15, 298.15, 303.15, 308.15, 313.15, and 318.15 K. From these experimental data, apparent molar volume, V ϕ , limiting apparent molar volume, V ϕ ° and the slope, S v , apparent molar compressibiliity, K s, ϕ , limiting apparent molar compressibility, K s, ϕ ° and the slope, S k , transfer volume, V ϕ, tr ° , transfer compressibility, K s, ϕ, tr ° , Falkenhagen Coefficient, A, Jones–Dole coefficient, B and temperature derivative of B-coefficient, d B/d T were calculated. The results are interpreted in terms of solute–solvent and solute–solute interactions in these systems. It has been observed that there exist strong solute–solvent interactions in these systems, which increase with increase in sucrose concentration.