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- Title
Characterization and Dissolution Study of Chitosan Freeze-Dried Systems for Drug Controlled Release.
- Authors
Ruiz-Caro, Roberto; Veiga-Ochoa, María Dolores
- Abstract
Freeze-dried systems (L) comprising chitosan (CS) and caffeine (CAF) have been developed for oral administration. Different proportions of CS and CAF have been used in the preparation of the systems. Hot stage microscopy (HSM), differential scanning calorimetry (DSC) and X-ray diffraction powder have been used to characterize the systems prepared. X-ray diffraction patterns showed that there were no interactions between CAF and CS molecules within the freeze-dried systems and the crystallinity of CAF was decreased. Swelling and dissolution tests were carried out in two different media (demineralized water and pH progressive medium) in order to establish their influence over CAF/CS system behaviour. Characteristic swelling behaviour of freeze-dried CS systems (imbibition and dissolution processes) was influenced by the proportions of CS and CAF in the formulations, and by the nature of the medium due to the pH-dependent solubility of CS. Release of CAF from lyophilized systems was conditioned by the swelling process and it should be possible to obtain a CAF/CS binary system with a specific time for total drug release including concrete proportions of both components. Furthermore, the freeze-drying process allowed us to obtain feasible systems for controlled release of CAF until the total amount of drug was released.
- Subjects
CHITOSAN; CAFFEINE; FREEZE-dried foods; MICROSCOPY; POLYSACCHARIDES; X-ray diffraction; POLYMERS; BIOCOMPATIBILITY; INORGANIC acids
- Publication
Molecules, 2009, Vol 14, Issue 11, p4370
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules14114370