Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

Densities, q of l-arginine in water and in aqueous d-xylose/l-arabinose (2.5% and 5% of d-xylose/l-arabinose, w/w in water) mixed solvents were measured at temperatures (293.15, 298.15, 303.15, 308.15, 313.15 and 318.15) K, and viscosities, g of these solutions at temperatures (298.15, 303.15, 308.15, 313.15 and 318.15) K were measured at atmospheric pressure. From the density values, the apparent molar volume, V/, limiting apparent molar volume, V /, slope, Sv and transfer volume, V /;tr and hydration number, nH were calculated. The viscosity values have been analysed on the basis of the Jones Dole equation; and Falkenhagen Coefficient, A and Jones Dole coefficient, B were calculated. The Gibbs energies of activation of viscous flow per mole of solvent, Dl1 and per mole of solute, Dl2 were also calculated. The results indicate that there exist strong solute solvent interactions in these systems, which increase with increase in carbohydrate concentration in both the solvents. It is observed that l-arginine act as a structure- maker in both these solvent systems.