EVALUATION OF DRYING AND MOISTURE SORPTION CHARACTERISTICS MODELS FOR SHIITAKE MUSHROOM (Lentinussquarrosulus Mont.) AND GREY OYSTER MUSHROOM (Pleurotussajor-caju (Fr.) Singer)
Keywords:
Thin-layer drying, desorption isotherm, equilibrium moisture content, isosteric heatAbstract
This paper presents the evaluation of moisture sorption isotherm models and thin-layer drying models for shiitake mushroom (Lentinussquarrosulus Mont.) and grey oyster mushroom (Pleurotussajor-caju (Fr.) Singer). The equilibrium moisture content of both mushroom samples was determined at temperatures of 40, 50, and 60°C with variation of water activity (0.1–0.8). The thin-layer drying experiments were conducted using air temperatures of 40, 50, and 60°C, while air velocity was kept constant at 0.6 m/s. The experimental data of the moisture sorption isotherms as well as the drying kinetics were fitted to various well-known theoretical models using nonlinear regression analysis. The suitable choice of prediction was made based on the coefficient of determination, the root mean square error, and the chi-square. Among several models, the so-called Lewicki-3 model containing 3 parameters was found to be a good choice to predict the EMC of both mushroom samples, whereas the 2-term model showed the best consistency of the observed moisture contents with the model-predicted ones. Furthermore, it was found from the drying rate curves that the falling-rate period was mostly observed in both mushroom samples, meaning that diffusion dominated the moisture transfer in the samples. The net isosteric heat of sorption was eventually calculated using the Clausius-Clapeyron equation in order to determine the energy requirement for drying both the shiitake mushroom and the grey oyster mushroom.
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