Solid-state and mechanical properties of aqueous chitosan-amylose starch films plasticized with polyols |
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Authors: | Cervera Mirna Fernández Heinämäki Jyrki Krogars Karin Jörgensen Anna C Karjalainen Milja Colarte Antonio Iraizoz Yliruusi Jouko |
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Institution: | 1Institute of Pharmacy and Food, University of Havana, Havana, Cuba ;2Pharmaceutical Technology Division, Department of Pharmacy, University of Helsinki, FIN-00014 Finland ;3Viikki Drug Discovery Technology Center DDTC, University of Helsinki, Finland |
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Abstract: | The film-forming ability of chitosan and binary mixtures of chitosan and native amylose corn starch (Hylon VII) was evaluated
with free films prepared by a casting/solvent evaporation method. Unplasticized and plasticized free chitosan films in aqueous
acetic acid and respective films containing a mixture of chitosan and native amylose starch in acetic acid were prepared.
Glycerol, sorbitol, and i-erythritol were used as plasticizers. Solid-state and mechanical properties of the films were studied
by powder x-ray diffractometry (XPRD), differential scanning calorimetry (DSC), and a materials testing machine. The films
composed of a mixture of chitosan and native amylose starch in acetic acid were clear and colorless. A plasticizer concentration
of 20% wt/wt (of the polymer weight) ws sufficient to obtain flexible films with all samples tested. X-ray diffraction patterns
and DSC thermograms indicated an amorphous state of the films independent of the type of plasticizer used. In conclusion,
incorporation of native amylose com starch into chitosan films improves the consistency and the mechanical properties of the
films. |
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