Apparent molar volumes and viscosities of solutions of mono- and disaccharides in water and in (DMSO plus water) mixed solvent systems at 293.15, 303.15 and 313.15 K

Apparent molar volumes (V-phi) and viscosities (eta) of solutions of mono- and disaccharides viz. glucose, fructose, sucrose and maltose have been determined in water and in dimethyl sulphoxide (DMSO) + water solvent systems of varying composition (10, 20 and 30%, w/w) at 293.15, 303.15 and 313.15 K as a function of molal concentration of saccharides. The V-phi and eta data have been analysed in the light of equations, V-phi = V(phi)0 + S(v)m and (eta(rel) - 1)/root m = A + B root m respectively. The activation thermodynamic quantities (Delta mu(0#)(2), Delta H-2(0#) and Delta S-2(0#)) of viscous flow for mono- and disaccharides in water and in (DMSO + water) mixed solvent systems have been determined at 293.15, 303.15 and 313.15 K. The results in regard to solute-solvent and solute-solute interactions in water and in (DMSO + water) mixed solvent systems have been discussed in terms of the values of V-phi(0) S-v and those of A and B. The values of limiting apparent molar expansibilities (phi(0)(E)) and that of (partial derivative V-2(phi)0/partial derivative T-2)(p) have been determined from temperature dependence of V-phi(0). The results of the study reveal, that mono- and disaccharides behave as structure-makers in water and also in (DMSO + water) mixed solvent systems of varying composition.