Densities and Viscosities of Amino Acid + Xylitol + Water Solutions at 293.15 ≤ T/K ≤ 323.15

Densities (ρ) and viscosities (η) of aqueous xylitol solutions with glycine, l -alanine, l -valine, l -threonine, or l -arginine were measured at T = (293.15 to 323.15) K under atmospheric pressure. The density values were utilized to further calculate the apparent molar volume ( V φ ), the limiting partial molar volumes of amino acids ( V φ 0 ), the limiting partial molar volumes of transfer (Δ tr V φ 0 ) and the interaction coefficients V ab, V abb, V abbb . The viscosity data were used to obtain viscosity B -coefficient, the free energies of activation per mole of solvent (Δμ 1 0≠ ) and solute (Δμ 2 0≠ ). The limiting partial molar volumes of transfer and the free energies of activation per mole of both solvent (Δμ 1 0≠ ) and solute (Δμ 2 0≠ ) were analyzed based on the cosphere overlap model and transition state theory, respectively. The hydration number of amino acid was determined using the obtained limiting partial molar volume and viscosity B -coefficient.