Journal
INTERNATIONAL JOURNAL OF PHARMACEUTICS
Volume 419, Issue 1-2, Pages 215-221Publisher
ELSEVIER
DOI: 10.1016/j.ijpharm.2011.08.008
Keywords
NMR imaging; Swelling; Carboxymethyl starch; Chitosan; Polyelectrolyte complex; Drug delivery
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Funding
- NSERC of Canada
- FQRNT of Quebec
- Canada Research Chair program
- MITACS of Canada
- FQRNT
- FRSQ
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The hydration and swelling properties of the tablets made of chitosan, carboxymethyl starch, and a polyelectrolyte complex of these two polysaccharides have been studied by NMR imaging. We studied the effect of pH and ionic strength on the swelling of the tablets and on the diffusion of fluid into the tablets in water and simulated physiological fluids. The pH value of the fluids exerts a more significant effect than their ionic strengths on the swelling of the tablets. The tablets are compared also with those made of crosslinked high amylose starch. The formation of complex helps to keep the integrity of the tablets in various media and render a slow and restricted swelling similar to that of the tablets of the cross-linked high amylase starch, which is significantly lower than the swelling of chitosan and of carboxymethyl starch. The capacities to modulate the release rate of drugs in different media are discussed by comparing the matrices and evaluating the preparation process of the complex. A sustained release of less soluble drugs such as aspirin in gastrointestinal fluids can be provided by the complex, due to the ionic interaction and hydrogen bonding between the drug and the biopolymer complex. (C) 2011 Elsevier B.V. All rights reserved.
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