화학공학소재연구정보센터
Journal of Chemical Thermodynamics, Vol.38, No.2, 136-143, 2006
Volumetric, viscometric, and refractive index behaviour of alpha-amino acids and their groups' contribution in aqueous D-glucose solution at different temperatures
Density, rho, viscosity, eta, and refractive index, n(D) measurements have been carried out on alpha-amino acids, glycine, DL-alanine, L-serine, and DL-valine (0.1 to 0.5) M in 0.2 M aqueous D-glucose solution at T = (298.15 303.15, 308.15, and 313.15) K. These measurements have been performed to evaluate some important parameters, viz, apparent molar volume, phi(v). limiting apparent molar volume, phi(o)(v) transfer volume, phi(o)(v)(tr), viscosity A and B-coefficients of Jones-Dole equation, variation of B with temperature, dB/dT, free energy of activation per mole of solvent, Delta mu(o#)(1), and solute, Delta mu(o#)(2), respectively, and molar refractive index, R-D. These parameters have been interpreted in terms of solute-solute and solute-solvent interactions and structure making/breaking ability of solutes in the given solution. In addition to this, phi(o)(v), B-coefficient and Delta mu(o#)(2), have been split into group contributions NH3+, COO-, and CH2 of the amino acids using their linear correlation with number of carbon atoms in the alkyl chain of the amino acids. (C) 2005 Elsevier Ltd. All rights reserved.