Partial molar volumes, expansibilities and compressibilities of glyglyglycine in aqueous sucrose and fructose solutions between 288.15 and 308.15 K

Abstract

Apparent molar volumes ( V ϕ) and apparent molar adiabatic compressibilities ( K ϕ,s ) of triglycine (glyglyglycine) in aqueous and mixed aqueous solutions of fructose and sucrose (2, 4, and 6 mass%) have been determined at 288.15, 293.15, 298.15, 303.15, and 308.15 K. From these data, limiting partial molar volumes ( V ϕ 0 ) and limiting partial molar adiabatic compressibilities ( K ϕ , s 0 ) for glyglyglycine in aqueous sucrose and fructose solutions have been evaluated, together with the standard partial molar properties of transfer Δ tr Y of the glyglyglycine from water to aqueous saccharides solutions. Transfer parameters have been interpreted in terms of solute–cosolute interactions on the basis of a cosphere overlap model. Pair and triplet interaction coefficients have also been calculated from transfer parameter data. The partial molar volume at infinite dilution ( V ϕ 0 ) were used to obtain the partial molar expansion at infinite dilution, E 2 0 , for glyglyglycine to examine the temperature dependence of such interactions.