Department of Chemistry, Agra College, Agra-282 002, Uttar Pradesh, India E-mail : mukhtarsingh2003@rediffmail.com Manuscript received 18 November 2008, revised 15 June 2009, accepted 16 June 2009 Apparent molar volumes (VΦ) and viscosities (η) of solutions of mono- and disaccharides viz. glucose, fructose, sucrose and maltose have been determined in water and in dimethyl sulphoxide (DMSO) + \'later solvent systems of varying composition (10, 20 and 30%, w/w) at 293.15, 303.15 and 313.15 K as a

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... function of molal concentration of saccharides. The VΦ and η data have been analysed in the light of equations, VΦ = VΦ + svm and (ηrel - 1)/M = A + B M respectively. The activation thermodynamic quantities (∆µ20#. ∆H20# and ∆S20# ) 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 be, n discussed in terms of the values of VoΦ, Sv and those of A and B. The values of limiting apparent molar expansibilities (Φ0E)and that of (∂2V0Φ/∂T2)P have been determined from temperature dependence of V0Φ. 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.