The three-parameter GAB equation was evaluated for its ability to describe the sorption data for severalagricultural products. The GAB equation describes the relationship between equilibrium moisture content and equilibriumrelative humidity (ERH) or water activity (Aw) at a fixed temperature. With Aw as the dependent variable, the equationbecomes very complex. The residual plots of this model showed that it does not fit well for starchy products. For mostproducts, the parameters of the GAB equation did not exhibit the Arrhenius-type relationship with temperature. Toincorporate the temperature term into the parameters, the number of parameters in the model increases, making it lessuseful. The GAB equation is not an adequate sorption model for all agricultural products.
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Chen et al. (1998) studied this question.
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