Kinetic Modeling of Plasticizer Migration from Starch-based Film in Food Simulants
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Abstract:
Esterified starch, with a high degree of substitution, and triacetin were used as the matrix and the plasticizer, respectively, to prepare a starch-based film. Thermogravimetric analysis (TGA) was employed to detect the changes in plasticizer content in the starch-based films when the film was exposed to different food simulants. The migration of plasticizer from the starch-based film was analyzed using the overall kinetic and the diffusion models. The results indicated that in 4% acetic acid system with a weak affinity towards the starch-based film, the whole plasticizer migration obeyed first-order kinetics; the short-term plasticizer migration obeyed the Fick’s second law; and the following migration obeyed the non-Fickian model of diffusion. In 65% aqueous ethanol and n-hexane systems with a stronger affinity towards starch-based films, the plasticizer migration did not obey the Fick’s law and the effect was more obvious for the long-term migration. Collectively, the results indicated that because of the different affinities between food simulants and film matrix, the plasticizer migration through the swelling layer towards food simulants exhibited different kinetic characteristics, which changed due to the effect of the interaction between films and simulant systems.
