Synthesis and characterization of chitosan-based pH-sensitive semi-interpenetrating network microspheres for controlled release of diclofenac sodium

pH-Sensitive semi-interpenetrating networks (IPNs) based on chitosan (Cs) and acrylamide-grafted hydroxyethylcellulose (AAm-g-HEC) were prepared in the form of microspheres (MPs) by emulsion-crosslinking technique using glutaraldehyde (GA) as a crosslinker. Diclofenac sodium (DS) drug was successful...

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Bibliographic Details
Published in:Carbohydrate research 2009-03, Vol.344 (5), p.699-706
Main Authors: AL-Kahtani Ahmed, A., Bhojya Naik, H.S., Sherigara, B.S.
Format: Article
Language:English
Subjects:
Anti-inflammatory drug
Chitosan
Chitosan - chemistry
Diclofenac - chemistry
Drug Delivery Systems
Hydrogen-Ion Concentration
In vitro release
Microscopy, Electron, Scanning
Microspheres
Molecular Structure
pH-Sensitive
Spectroscopy, Fourier Transform Infrared
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Summary:pH-Sensitive semi-interpenetrating networks (IPNs) based on chitosan (Cs) and acrylamide-grafted hydroxyethylcellulose (AAm-g-HEC) were prepared in the form of microspheres (MPs) by emulsion-crosslinking technique using glutaraldehyde (GA) as a crosslinker. Diclofenac sodium (DS) drug was successfully encapsulated into IPN microspheres by varying the ratio of Cs and AAm-g-HEC, % drug loading, and amount of GA. DS encapsulation of up to 83% was obtained as measured by UV spectroscopy. MPs with average particle sizes in the range of 188–310 μm were obtained. MPs were characterized by Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), and Differential scanning calorimetry (DSC). Diffusion coefficients ( D) of water transport through the microspheres were determined using an empirical equation. In vitro release of DS from these matrices has been investigated in pH 1.2 and 7.4 media.
ISSN:0008-6215
1873-426X
DOI:10.1016/j.carres.2009.01.011