Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

Densities, ultrasonic speeds, and viscosities of solutions of glycine/l-alanine/l-valine/l-isoleucine in water and aqueous-streptomycin sulfate {1% (0.0069 mol kg-1) and 2% (0.0137 mol kg-1) streptomycin sulfate in water} mixed solvents were measured at T (293.15, 298.15, 303.15, 308.15, 313.15, and 318.15) K and atmospheric pressure. From these experimental results, the apparent molar volume, limiting apparent molar volume, and the slope, apparent molar compressibility, limiting apparent molar compressibility, and the slope, transfer volume, transfer compressibility, limiting apparent molar expansivity, Falkenhagen Coefficient, Jones Dole coefficient, hydration number, and temperature derivative of B-coefficient were calculated. Also, the activation parameters such as the free energies of activation of viscous flow per mole of solvent and per mole of solute were calculated and discussed in terms of transition state theory. The results are interpreted in terms of (solute + solvent) and (solute + solute) interactions in these systems. It has been observed that all these amino acids act as structure-breaker in aqueous-streptomycin sulfate solvents. In addition to this, V, K and .mu. have been split into group contributions of the amino acids using linear correlation with number of carbon atoms in the alkyl chain of the amino acids.