(204b) Volumetric Properties of Saccharide in Aqueous Ionic Liquid Mixtures at Different Temperatures

Saccharides and their derivatives as the most abundant class of biomolecules are the receptors of biologically active compounds (enzymes, drugs, etc.) and they are able to stabilize the native state of proteins/enzymes. In the present study, experimental density data of aqueous solutions of 1-butyl-3-methylimidazolium hydrogen sulfate ionic liquid containing saccharide have been determined at different temperatures and composition. The saccharide studied was D(+)-glucose (molalities saccharides range from 0.015 - 1.7 mol∙kg^-1) in water and in (0.025; 0.050; 0.075 and 0.1 mol∙kg^-1) aqueous ionic liquid solution at temperatures of T = (283.15, 288.15, 293.15, 298.15 and 303.15) K. Density of solutions have been determined by using a vibrating-tube densimeter manufactured by Anton Paar (Model 4500). Experimental results have been used to determine the apparent molar volumes, apparent molar volumes at infinite dilution and partial molar volumes of transfer of the saccharide from water to aqueous ionic liquid solutions. The results lead to believe that possible hydrophilic-ionic interactions among the hydrophilic groups (-OH, -C=O, -O-) of the saccharide and the ions of ionic liquid can be predominant in the systems studied.