Abstract
The equilibrium moisture content of dehumidified air-dried Aloe vera (Aloe barbadensis Miller) gel powder was measured by the static gravimetric method. The equilibrium was achieved after 10 days for adsorption at 25 °C, 32 °C, and 39°C with water activity ranging from 0.10 to 0.90. The sorption isotherm ofAloe vera gel powder decreased with increase in temperature at constant relative humidity. The experimental data of sorption were fitted by four models (GAB, Smith, Oswin, and Peleg). The models were compared using the sum of squares error (SSE), mean relative percent deviation modulus (P), coefficient of correlation (R 2 ), root mean square error (RMSE), chi-square statistic (χ 2 ), and the trend of residual plots. Results proved that the GAB model was more appropriated for predicting the equilibrium moisture content of Aloe vera gel powder for the range of temperatures and water activities studied. The net isosteric heat of sorption ranged from 2.23% to 22.16% kJ mol -1 for moisture contents ranging from 2% to 18% (d.b.).
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