Molecular Interactions in L-threonine Aqueous-Lactose Solutions at (293.15–313.15) K on Viscometric Data

Resumo

Viscosity measurements of L-threonine in the range (0.025–0.2) mol kg^–1 in various aqueous-lactose solutions (0–6 wt % of lactose in water) have been carried out at temperatures (293.15–313.15) K. Jones–Dole coefficients, viscosity B-coefficients of transfer, B_tr, variation of B with temperature, dB/dT and solvation behavior, B/\(V_{\phi }^{^\circ }\) of L-threonine have been obtained. Further, the free energy of activation of viscous flow per mole of solvent, as well as per mole of solute, along with activation enthalpy, and activation entropy has also been evaluated. The results have been interpreted in terms of various molecular interactions prevalent in these systems and moreover, it has been seen that the L-threonine acts as structure maker in all studied solutions.