Densities and viscosities of glycine, L-alanine, Lvaline, L-threonine, and L-arginine in aqueous solutions of (0.0, 0.2, 0.4, 0.6, 0.8, and 1.0) mol·kg −1 mannitol have been measured in the temperature range of (293.15 to 323.15) K under atmospheric pressure; then the measured densities and viscosities of experimental systems were correlated. These data were further used to calculate the apparent molar volumes (V φ ), the limiting partial molar volumes (V φ 0 ), the limiting partial molar volumes of transfer (Δ tr V φ 0 ), the viscosity Bcoefficients, and the free energies of activation per mole of solvent (Δμ 1 0≠ ) and solute (Δμ 2 0≠ ). The results were interpreted through solute−solute interaction and solute− solvent interaction on the basis of the cosphere overlap model and transition state theory.
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 (Δtr
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 (Δμ1
0≠) and solute (Δμ2
0≠). The limiting partial molar volumes of transfer
and the free energies of activation per mole of both solvent (Δμ1
0≠) and solute (Δμ2
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.
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