Thermodynamics Research Center / ThermoML | Thermochimica Acta

ABSTRACT

Density and speed of sound values of (glycylglycine + 1M aqueous glucose / 1M aqueous sucrose) systems have been measured as a function of molal concentration of glycylglycine at temperatures: 298.15, 303.15, 308.15, 313.15, 318.15, 318.15 and 323.15 K by an oscillating- tube density and sound velocity meter. The isentropic compressibilities, partial molal volumes and partial molal compressibilities of the (glycylglycine + 1M aqueous glucose / 1M aqueous sucrose) systems have been computed from the density and speed of sound data. The isentropic compressibilitiy values decrease with an increase in molal concentration of solute as well as temperature. The partial molal volumes increase whereas partial molal compressibilities decrease with an increase in temperature. The trends of variations of experimental and computed parameters have been discussed in terms of hydrophilic-ionic group, hydrophilic-hydrophilic and hydrophilic-hydrophobic interactions operative in the systems.