4.2. Desorption isothermsFig. 3 shows the experimental desorption isotherms for cocoabeans at 30, 45 and 60 C with its respective fitting to the GABmodel. Desorption isotherm shows an increase in equilibriummoisture content with increasing water activity, at constant temperature. The equilibrium moisture content decreases with thetemperature at constant water activity. The GAB model was testedfor adequacy and goodness of fit by determining the coefficient ofcorrelation (r2), mean relative percentage deviation modulus (E),root mean square error (RMSE) and residual plots. These valuesand the model parameters obtained by nonlinear regression analysis are presented in Table 5. This model presented a good fit forthe experimental data of the cocoa beans. The GAB model is themost widely accepted and representative model for sorption isotherms of foods (ASAE, 2004), mainly due to its accuracy and validity over a wide range of water activities from 0.11 to 0.90.