The activity coefficients at infinite dilution, gamma(infinity)(13) (the subscript 1 and 3 correspond to solute and solvent, respectively), for 21 solutes, including alkane, cycloalkane, alkene, aromatic compounds, alcohol, ester, ketone, and halogenated hydrocarbons, in four solvents, that are the saturated fatty acids: capric (decanoic) acid, lauric (dodecanoic) acid, myristic (tetradecanoic) acid, and palmitic (hexadecanoic) acid, were determined by gas-liquid chromatography at temperatures from 314.10 K to 358.33 K. Comparison with previously published for selected solutes in palmitic (hexadecanoic) acid were also performed. The values of the partial molar excess Gibbs free energy, Delta G(13)(infinity), enthalpy, Delta H-13(infinity), and entropy, Delta S-13(infinity), at infinite dilution were calculated from experimental gamma(infinity)(13) values obtained over the temperature range. Results obtained in this work allow a more accurate description of the real behavior of fatty systems. (C) 2012 Elsevier Ltd. All rights reserved.