ABSTRACT
Sound velocity, U, and density,Rho, of some amino acids viz. glycine, methionine, phenylalanine and tryptophan were determined in 0.1, 0.2 and 0.3 mol kg[-1]aqueous disodium citrate solutions as a function of concentration at 298-313.15K using DSA 5000M. The experimental data were further used to compute various acoustical parameters such as adiabatic compressibility, beta, apparent molar compressibility, phi[k], partial molar compressibility, phi°[k], transfer adiabatic compressibility, phi[ktr] constant, S[k], and the hydration number, n[h]- The transfer adiabatic compressibility shows the supremacy of hydrophilic-ionic interactions under hydrophobic-ionic interactions. The above-mentioned parameters are relevant for the efficiency of mediation in pharmacology and can be interpreted in terms of structure-making or structure-breaking ability of these amino acids in the solution