Abstract
The enthalpies of l-methionine dissolution in aqueous solution of acetonitrile, 1,4-dioxane, acetone, dimethylsulfoxide, formamide, N-methylformamide, N,N-dimethylformamide and N,N-dimethylacetamide were determined by calorimetric method at 298.15K and organic solvent mole fractions up to x2∼0.35. The standard enthalpies of solution (ΔsolH°) and transfer (ΔtrH°) of l-methionine from water to a mixed solvent as well as the enthalpy coefficients of pairwise interactions (hxy) were calculated. The interrelation between enthalpy characteristics of l-methionine dissolution (transfer) and the composition of water–organic mixtures was determined. Contributions of the organic solvent properties (molar volume, cohesion energy density, polarity/polarizability, acidity and basicity) to the energy of pairwise interactions of l-methionine – organic solvent were estimated quantitatively by means of a modified Kamlet-Taft equation. Some characteristics of intermolecular interactions of l-methionine with the molecules of organic solvents were compared with the analogous characteristics of previously investigated amino acids.
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