Aqueous solutions containing amino acids and peptides 9. The Gibbs free energy of interaction of N-glycyl glycine and N-(N-glycyl glycyl) glycine with sodium chloride at 298.15 K

Abstract

Cells with transference have been used to obtain information on the Gibbs free energy of interaction of sodium chloride with the peptides N-glycyl glycine and N-(N-glycyl glycyl) glycine in water at 298.15 K. The results obtained are compared with those for some α,gw-amino acids. It is concluded that a frequently used electrostatic approach of Kirkwood's has limited application, and for molecules of the same dipole moment that the peptides interact with sodium chloride in a more attractive way.