Ultrasonic, transport and vibrational frequency analysis of non-aqueous peptide + electrolyte solutions

Abstract

Ultrasonic method finds extensive application in investigating various physicochemical parameters involving molecular interactions in liquid mixtures. The density, viscosity and ultrasonic velocity measurements were carried out in non-aqueous peptide and electrolyte solutions at different concentrations and temperatures to illustrate the intermolecular interactions prevailing in the solutions. The main transport parameters such as adiabatic compressibility, internal pressure and free volume have been computed using the measured values. These parameters were utilized to interpret the intermolecular interactions existing in the mixture of glycyl-glycine and potassium ascorbate in non-aqueous formamide medium. The ultrasonic results are corroborated with the vibrational frequency analysis of the peptide and ascorbate solutions.