Volumetric and viscometric properties of amino acids in aqueous maltitol solutions at T = (293.15–323.15) K

Abstract

The densities and viscosities of the ternary mixtures of glycine, l-alanine, l-valine, l-threonine and l-arginine in aqueous maltitol solutions were measured at T=(293.15–323.15)K under the atmospheric pressure. The apparent molar volume (Vφ), the limiting partial molar volume (Vφ0) and the limiting partial molar volume of transfer (ΔtrVφ0) were obtained in terms of the measured density, then the viscosity B-coefficient was further calculated by the least-square method. Meanwhile, the partial molar isobaric expansion (E20), the isobaric thermal expansion coefficient (α2), the solvation number (nS), the free energies of activation per mole of solvent (Δμ10≠) and per mole of solute (Δμ20≠) were also calculated. The volumetric and viscometric properties were analyzed and discussed according to the interactions between amino acids and maltitol molecules based on the co-sphere overlap model and the transition state theory.