Thermodynamic studies of molar volume, pair and triplet interactions at increasing side-chain length of α-amino acids in aqueous potassium chloride solutions at different concentration and 310.15 K

Densities (ρ) of glycine, alanine and leucine in aqueous solutions of potassium chloride (KCl) (0.01-0.10 mol kg− 1) have been measured at 310.15 K. Apparent molar volumes (Vϕ), limiting partial molar volumes (Vϕ0) and group contributions to partial molar volumes have been determined for the amino acids. The trends of transfer volumes (ΔVϕ0) 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 parameters.