Densities, rho, and viscosities, eta, of glycine, DL-alpha-alanine, DL-alpha-amino-n-butyric acid, and L-leucine in 1.0, 2.0, 4.0, and 6.0 mol.kg(-1) aqueous 1,2-propanadiol solutions have been determined at 298.15 K. The partial molar volumes, V-2(infinity), obtained from densities have been used to calculate the corresponding volumes of transfer, Delta(t)V(infinity) at infinite dilution from water to different concentrations of aqueous 1,2-propanediol solutions for rationalizing various interations. The Jones-Dole equation has been fitted to the viscosity data to calculate B-coefficients. Results show that in the case of glycine and DL-alpha-alanine the ion-dipolar interactions are dominating while hydrophobic-hydrophobic and hydrophilic-hydrophobic interactions are also showing their predominant role in other cases.