|Author||Jameela, S. R. ♦ Kumari, T. V. ♦ Lal, A. V. ♦ Jayakrishnan, A.|
|Source||Sree Chitra Tirunal Institute for Medical Sciences & Technology|
|Publisher||Journal of Controlled Release|
|Subject Domain (in DDC)||Technology ♦ Medicine & health ♦ Pharmacology and therapeutics|
|Subject Domain (in MeSH)||Therapeutics ♦ Analytical, Diagnostic and Therapeutic Techniques and Equipment|
|Subject Keyword||Drug Delivery|
|Abstract||Smooth, highly spherical, crosslinked chitosan microspheres in the size range of 45-300 mu m loaded with progesterone were prepared by glutaraldehyde crosslinking of an aqueous acetic acid dispersion of chitosan containing progesterone in a non-aqueous dispersion medium consisting of liquid paraffin and petroleum ether stabilized using sorbitan sesquioleate. Ln vitro release of the drug into phosphate buffer at 37 degrees C was determined as a function of crosslinking density of the microspheres and particle size. The extent of drug release had a remarkable dependence on the crosslinking density of the microspheres, the highly crosslinked spheres releasing only around 35% of the incorporated steroid in 40 days compared to 70% from spheres lightly crosslinked. Determination of the in vivo bioavailability of the steroid from microsphere formulation by intramuscular injection in rabbits showed that a plasma concentration of 1 to 2 ng/ml was maintained up to 5 months without a high 'burst effect'. Data obtained suggest that the crosslinked chitosan microspheres would be an interesting system for long term delivery of steroids, (C) 1998 Elsevier Science B.V.|
|Education Level||UG and PG|
|Learning Resource Type||Article|
|Educational Framework||Medical Council of India (MCI)|
|Journal||JOURNAL OF CONTROLLED RELEASE|
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