Equilibrium Moisture Content Models for Maytenus ilicifolia Leaves

Knowledge of the relationship between the air relative humidity and moisture content of the test material is essential for the drying and storage process research. The aim of this work was to determine sorption isotherms of Maytenus ilicifolia leaves and to compare the experimental results with mathematical models in the literature. The equilibrium moisture content for M. ilicifolia leaves was measured using the static method, at relative humidities and temperatures ranging from 11% to 85% and from 30 to 60 °C, respectively. The experimental data were compared with five models available in the literature (Chung–Pfost, modified Halsey, modified Oswin, Henderson–Thompson and Guggenheim–Anderson–deBoer). The adsorption data were best described by the Chung–Pfost equation, while the desorption data were best fitted by the Henderson–Thompson equation. Thus, these models can be used for the estimation of the equilibrium moisture content of M. ilicifolia leaves.