Murici (Byrsonima sericea) and inga (Inga edulis) desorption isotherms were determined by the gravimetric method at two different temperatures. Experimental data was adjusted to five sorption models of Langmuir, Oswin, Anderson, GAB and Peleg. Sorption isotherms were determined gravimetrically by exposing the samples to controlled atmospheres produced by saturated salt solutions. The coefficient of regression R-2 and mean squares of error (E%) between experimental and calculated data were obtained to select the best model. In relation to the isotherm model the best models were, GAB and Oswin obtaining minor values of % mean errors and higher coefficient of determination. The GAB model was found to be the best fit out of the five models evaluated. (c) 2005 Elsevier Ltd. All rights reserved.