Abstract
The integral enthalpies of solution of DL-α-alanylglycine and DL-α-alanylalanine in water-ethanol, water-n-propanol, and water-isopropanol mixtures were measured calorimetrically at alcohol concentrations x 2 = 0−0.4 mole fractions. The standard enthalpies of solution (Δsol H°) of the peptides and their transfer (Δtr H°) from water into the mixed solvents were calculated. The influence of the structure and properties of the solutes and mixture composition on the enthalpy characteristics were considered. The Δsol H° = f(x 2) and Δtr H° = f(x 2) dependences were found to have extrema. The enthalpy coefficients of pair interactions (h xy ) between the peptide and alcohol molecules were calculated. The coefficients were positive and increased in the series ethanol, n-propanol, isopropanol.
Published Version
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