Calculation of effective diffusivity, mass transfer coefficient, kinetic, and thermodynamic parameters for the extraction process of bioactive materials from fig leaves

Abstract

Prediction of kinetic, thermodynamic, and mass transfer parameters enable the comprehension of the structure of the solid-liquid extraction system. In this study, fig (Ficus carica) leaves were extracted by ethanol solution (10%, v/v) through microwave-assisted extraction (MAE) under 100, 200, 300, 400, and 500 W. Diffusion coefficient was calculated as 1.958 x 10(-7), 1.543 x 10(-7) , and 1.089 x 10(-7) m(2) s(-1), while mass transfer coefficient changed as 0.0364, 0.0573, and 0.0541 m s(-1) under 345, 351, and 352 K, respectively. Biot number (1487.23, 2970.83, and 3974.28) was elevated with temperature. Pseudo-second-order kinetic equation characterized the kinetic findings of the MAE more satisfactorily comparing to pseudo-first-order kinetic equation. An endothermic, and spontaneous nature was observed based on the enthalpy (281.98 kJ mol(-1)), entropy (0.834 kJ mol(-1) K-1) and Gibbs free energy changes (- 5.748, - 10.752, and - 11.586 kJ mol(-1)).