The mango pulp (Mangífera indica L.) has been submitted to the desorption process, at the temperatures of 20, 40 and 60 ºC, and relative humidity of the air varying from 29.3 to 82.3% until the equilibrium. Five mathematical models of sorption of hygroscopic products (BET, GAB, Halsey, Oswin and Smith) were adjusted to the experimental data to obtain the coefficients of the models and to choose which one best represented the isotherms for the calculation of the isosteric sorption heat. The choice of the best fit was based on the coefficient of determination (R²) and on the relative mean deviation (P). The GAB model was the one which best represented the desorption isotherms, the other models also represented satisfactory the experimental data and may be used for the calculation of the hygroscopic equilibrium humidity of the mango pulp; the sorption heat varied positively from 104.50 to 355.36 kJ kg-1.
isotherms; hygroscopic equilibrium; Mangifera indica L.
