Abstract
The sorption isotherms of Aloe vera were determined at 8, 30 and 45 °C, for a range of water activity (0.10-0.95). Modeling of the isotherms was done using the GAB, BET, Oswin, Halsey, Henderson, Smith, Caurie and Iglesias-Chirife equations. The fit quality of the models on experimental data was evaluated using the determination coefficient, sum squared errors and chi-square statisticals. The statistical results showed that the best fit quality was obtained by the Iglesias-Chirife model, followed by the GAB and Halsey. Monolayer moisture contents were obtained between 0.05-0.19 g water/g d.m. In addition, these parameters were temperature-dependent according to an Arrhenius-type equation. The sorption heat was calculated using the Clausius-Clapeyron equation giving 133.40 kJmol-1 (desorption) and 49.60 kJmol-1 (adsorption) at a moisture content of 0.01 g water/g d.m. The experimental heat data showed a good fit quality when these were evaluated by the Tsami equation.
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