was used to
represent the experimental equilibrium data. In this equation, the
parameter Xw is the equilibrium moisture (g water/g dry mass), m0
is the monolayer water content, C is the Guggenheim constant,
which represents the sorption heat of the first layer and k is the
sorption heat of the multilayers. GAB model parameters were
determined by non-linear regression, using Statistica Software 6.0
(Statsoft, USA).