Interactions in (L-alanine/L-threonine plus aqueous glucose/aqueous sucrose) systems at (298.15-323.15)K

Densities and speeds of sound of (L-alanine + 1 mol L-1 aqueous glucose/1 mol L-1 aqueous sucrose) and (L-threonine + 1 mol L-1 aqueous glucose/1 mol L-1 aqueous sucrose) systems have been measured as a function of molal concentration of L-alanine and L-threonine at temperatures: (298.15, 303.15, 308.15, 313.15, 318.15, and 323.15)K. The partial molar volumes, transfer partial molar volumes, partial molar isentropic compressibilities and transfer partial molar isentropic compressibilities have been evaluated using the experimentally measured values of density and speed of sound. The trends of variations of experimental and computed parameters have been discussed in terms of ionic-hydrophilic, hydrophilic-hydrophilic and hydrophilic-hydrophobic interactions operative in the systems. (C) 2011 Elsevier B.V. All rights reserved.