Heat capacity changes and partial molal heat capacities of some di‐ and tripeptides in water

Integral enthalpies of solution of several dipeptides and tripeptides in water at low concentrations have been determined at 25 and 35°C. These data have been used to derive the changes in heat capacity on dissolution at infinite dilution ΔC at 30°C. Limiting partial molal heat capacities ΔC have been determined by combining ΔC with Cp2 (heat capacity of pure solid peptides). Using the data on ω‐amino acids and these peptides, the partial molal heat capacity of a peptide group CONH was semiquantitatively estimated.