Abstract
Enthalpies of solution for DL-α-alanyl-β-alanine in H2O-ethanol, H2O-1-propanol, and H2O-2-propanol mixed solvents with the alcohol mole fraction x2 = 0–0.3 are measured at 298.15 K. Standard enthalpies of solution (ΔsolH∘), standard enthalpies of transfer of DL-α-alanyl-β-alanine from water to binary solvent (ΔtrH∘), and coefficients of enthalpies of pair interactions with alcohol molecules (hxy) are calculated. The effect the structure and properties of alcohols and the composition of a water-alcohol mixture have on the enthalpy of dissolution for DL-α-alanyl-β-alanine are discussed. The hxy values for dipeptides of the alanine series in water-alcohol binary solvents are compared.
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