Study on interactions of saccharides and their derivatives with potassium phosphate monobasic (1:1 electrolyte) in aqueous solutions at different temperatures

The densities (rho) of monosaccharides, their methyl and deoxy derivatives, disaccharides and trisaccharides have been measured in water and in (025, 0.50, 1.00 and 125) mol kg(-1) aqueous potassium phosphate monobasic (KH2PO4) solutions at (288.15, 298.15, 308.15 and 318.15) K and atmospheric pressure. The standard partial molar volumes ((V) over circle (2)) at infinite dilution and the corresponding volumes of transfer (Delta t (V) over circle (2)) of solutes (saccharides and derivatives) from water to aqueous solutions of KH2PO4 have been calculated. The interaction coefficients (using the McMillan-Mayer theory) and standard partial molar expansibilities ((V) over circle (E)) have also been calculated. The results suggested the dominance of hydrophilic-ionic interactions due to the great affinity of phosphate (H2PO4-) anions for hydrogen bonding with hydrophilic sites of the saccharide molecules. (C) 2014 Elsevier B.V. All rights reserved.