N-acylated chitosan: hydrophobic matrices for controlled drug release
Tipo de material:
TextoSeries ; Journal of Controlled Release, 93(1), p.1-13, 2003Trabajos contenidos: - Le Tien, C
- Lacroix, M
- Ispas-Szabo, P
- Mateescu, Ma
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N-acylation of chitosan with various fatty acid (C6-C16)chlorides increased its hydrophobic character and made important changes in its structural features. Unmodified chitosan exhibited a low degree of order (DO)and a weak tablet crushing strength. Chitosan acylated with a short chain length (C6)possessed similar properties, but exhibited significant swelling. Acylation with longer side chains (C8-C16)resulted in a higher DO and crushing strength but lower swelling. The best mechanical characteristics and drug release properties were found for palmitoyl chitosan (substitution degree 40-50
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