Densities and viscosities of L-proline and L-glutamine in aqueous metal electrolytes solution containing 0.06 and 0. 1 OM Cull nitrate and Ni II chloride, have been determined experimentally at 308 K. The results obtained from density and viscosity measurements have been used to calculate the apparent molar volume, phi(v), relative viscosity, eta(rel) transfer volume phi(0)(v(tr),) at infinite dilution, free energy of activation of viscous flow of solvent Delta mu(0#)(1) and solute Delta mu(0#)(2). The partial molar volume, phi(0)(v), at infinite dilution, Falkenhagen, A, and Jones-Dole coefficient, B, were calculated by least-square method. The results are discussed in terms of the dehydration effect of the electrolyte upon the amino acids. The properties of these amino acids in water and water+electrolytes solution systems are discussed in terms of the charge, size and hydrogen bonding effect. (c) 2007 Elsevier B.V All rights reserved.