فهرست نشریات علمی دسترسی آزاد ایران

Catechins from fresh green tea leaves as potential sources of anticancer and antioxidant components were target materials in this work. Superheated water extraction, which is a kind of leaching operation, and solvent partition with chloroform and ethyl acetate were utilized to recover Catechins from tea leaves. Then, a mathematical model was developed to simulate the superheated water extraction of Catechins. The unsteady state mass balance of the solute in solid and superheated water phases led to two partial dierential equations. The model was solved numerically using a linear equilibrium relationship. The model parameters were predicted applying existing experimental correlations. An intraparticle diusion coecient was used as the model tuning parameter. The model is able to show the in uence of dierent process parameters, such as time of extraction, particle size and the ratio of water/leaves (v/w), on Catechin recovery.