Volumetric, viscometric, and acoustic behaviour of diglycine in aqueous saccharide solutions at different temperatures

Density, ρ, speed of sound, u, and viscosity, η measurements have been carried out on diglycine (0.05-0.30 mol kg− 1) in aqueous glucose, galactose and fructose solutions ranging from pure water to 6 mass % of saccharides at 288.15, 298.15 and 308.15 K. These data were used to calculate the corresponding apparent molar volume, Vϕ, limiting apparent molar volume, Vϕ0, transfer volume ΔtrVϕ0, viscosity B-coefficients of Jones-Dole equation, apparent molar adiabatic compressibility, Kϕ,S, limiting apparent molar adiabatic compressibility, Kϕ,S0, and its transfer values ΔtrKϕ,S0 at infinite dilution. The activation free energy, Δμ20⁎, for viscous flow in different aqueous saccharide solutions have been calculated from B-coefficient and partial molar volume data. Hydration numbers, nH and interaction coefficients, YAB, and YABB, have also been calculated from these data. These parameters have been discussed in terms of solute-solvent interactions. We have also attempted to examine the temperature and concentration dependence of such interactions.