Journal of Chemical Thermodynamics, Vol.43, No.4, 603-612, 2011
Volumetric, ultrasonic, and viscometric behaviour of l-histidine in aqueous-glucose solutions at different temperatures
Densities, rho, ultrasonic speeds, u, and viscosities, eta, of aqueous-glucose (5%, 10%, 15%, and 20% of glucose, w/w in water) and of solutions of l-histidine in aqueous-glucose solvents were measured at T = (293.15, 298.15, 303.15, 308.15, 313.15, and 318.15) K. From these experimental data, apparent molar volume, V-phi, limiting apparent molar volume, V degrees(phi) and the slope, S-v, apparent molar compressibility, K-S,K-phi, limiting apparent molar compressibility, K degrees(s,phi), and the slope, S-k, transfer volume, V degrees(phi,tr), transfer compressibility, K degrees(S,phi,tr), Falkenhagen coefficient, A, Jones-Dole coefficient, B. and temperature derivative of B-coefficient, dB/dT were calculated. The results are interpreted in terms of solute-solute and solute-solvent interactions in these systems. It has been observed that there exist strong solute-solvent interactions in these systems, which increase with increase in glucose concentration. It has also been observed that l-histidine act as structure-maker in aqueous-glucose solvents. (C) 2010 Elsevier Ltd. All rights reserved.
Keywords:Ultrasonic speed;Viscosity;l-Histidine;Apparent molar volume;Apparent molar compressibility;Molecular interactions