Abstract
Moisture adsorption isotherm study of dried Cassia alata was evaluated in this work. Adsorption isotherm of dried C. alata was determined at three different temperatures (10, 30 and 40 °C) and at six levels of relative humidity (ranging from 23 to 87%) using a gravimetric technique. The sorption isotherms were found to be typical type II sigmoid. The experimental data obtained was fitted to several mathematical models viz. two-parameter (BET, Oswin, Smith, Caurie, and Iglesias and Chirife), and three-parameter (GAB) relationships. Standard statistical procedures were applied to deduce percent error (P), root mean square error (RMSE) and coefficient of relation (r2). In terms of the mean absolute percentage error (P) of the fits, those with less than 10% error can be considered acceptable and an r2 of >0.98 may also indicate a good fit. The Peleg followed by Iglesias and Chirife model were found to best fit the experimental data.
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