Journal of Pure and Applied Ultrasonics

Roli Srivastava ¹, Archana Pandey ¹, Ravindra K. Gupta ¹, Arti Gupta ¹

Affiliations
1 Department of Chemistry, C.M.P. College, University of Allahabad, Allahabad-211002, IN

Abstract

The data for density (ρ), viscosity (η) and ultrasonic velocity (u) of aqueous solutions of threonine with lactose monohydrate and sucrose have been measured as a function of amino acid concentration at different temperatures. Using these data various interaction parameters viz. adiabatic compressibility (β), molar hydration number (nH), apparent molar compressibility (φ_k), apparent molar volume (φ_v), limiting apparent molar compressibility, limiting apparent molar volume and their constants (S_k,S_v) and viscosity A and B coefficient of Jones-Dole equation. These parameters have been interpreted the molecular interactions in terms of solute-solute and solute-solvent interaction present in the given solutions. Free energies of activation of aqueous amino acids were obtained by application of the transition-state theory to the B-coefficient data and the corresponding activation parameters were given. The Redlich-Kister model was used to correlate the measured properties. It was found that in all cases, the experimental data obtained fitted with the values correlated by the corresponding models very well.

Keywords

Acoustical, Ultrasonic Velocity, Saccharides, Compressibility, Viscosity A and B Coefficient.

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A. R. Saksena ¹, Roli Srivastava ², Arti Gupta ²

Affiliations
1 Department of Chemistry, C.M.P. Degree College, University of Allahabad, Allahabad-211002, U.P.
2 Department of Chemistry, C.M.P. Degree College, University of Allahabad, Allahabad-211002, U.P., IN

Abstract

Density, ultrasonic velocity for ternary systems (Amino acid+I₂+water) containing Alanine, Valine, Leucine, Isoleucine in aqueous solutions have been measured for several concentrations of amino acids as donors at different temperatures( 303,313,323 K). Using above data apparent molar volume Φ_v partial molar volume Φ_v⁰, adiabatic compressibility β_s, relative adiabatic compressibility β_r relative association parameter RA, and specific impedance Z have been computed. The Δβ_s and β_r exhibit increasing trend of variation with successive increase in amino acid concentration and decreasing trend with increase in temperature in all systems. It is due to overall increase in cohesive forces in the solution. On the other hand above values decrease with increase in temperature is due to thermal rupture of water structure with temperature. Such behavior leads to weak solute-solute and solute-solvent interaction in the system. The parabolic plots emerge into non linear ones with points of inflexion showing no removal of charge but Collisional complex formation. A non linear regression analysis has been made to determine the feed back coefficient of regression and correlation coefficient.

Keywords

Ultrasonic Velocity, Ternary System, Amino Acids, Molecular Interaction.

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