Volumetric and viscometric properties of amino acids in aqueous myo-inositol solution at T = (293.15 to 323.15) K and p = 0.101 MPa

Abstract

Densities and viscosities of glycine, L-alanine, L-valine, L-threonine and L-arginine in aqueous (0.1–0.5) mol·kg−1myo-inositol solutions were measured at T=(293.15, 303.15, 313.15 and 323.15) K and p=0.101MPa. The volumetric properties such as the apparent molar volume (Vφ), the limiting partial molar volume (Vφ0), the limiting partial molar volumes of transfer (ΔtrVφ0), the limiting apparent molar expansibility (E20), Hepler's constant and the isobaric thermal expansion coefficient (α2) were calculated through density. The viscometric properties such as the B-coefficient, the free energies of activation per mole of solvent (Δμ10≠) and solute (Δμ20≠) were obtained from the experimental viscosity data. The derived parameters hydration number and solvation number were also calculated through apparent molar volume and B-coefficient. From the volumetric and viscometric properties, the solute-solute and solute-solvent interactions in the studied systems were analyzed on the basis of co-sphere overlap model and transition state theory. Finally, the group contribution method was applied to calculate the contribution of (NH3+, COO−), CH2, OH and CNHNHNH2 of amino acids to Vφ0, B-coefficient and Δμ20≠.