2.3.3. Moisture sorption isotherms
Film moisture sorption isotherms were determined at 25 C by
the static method, using saturated saline solutions to obtain
different relative humidities (Bell and Labuza, 2000). The Guggenheim–
Anderson–de Boer (GAB) model (Eq. (2)) 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).
2.3.3. Moisture sorption isothermsFilm moisture sorption isotherms were determined at 25 C bythe static method, using saturated saline solutions to obtaindifferent relative humidities (Bell and Labuza, 2000). The Guggenheim–Anderson–de Boer (GAB) model (Eq. (2)) was used torepresent the experimental equilibrium data. In this equation, theparameter Xw is the equilibrium moisture (g water/g dry mass), m0is the monolayer water content, C is the Guggenheim constant,which represents the sorption heat of the first layer and k is thesorption heat of the multilayers. GAB model parameters weredetermined by non-linear regression, using Statistica Software 6.0(Statsoft, USA).
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