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Two-stage optimization process for formulation of chitosan microspheres.

Rajesh R Dubey1, Rajesh H Parikh

  • 1AR College of Pharmacy & GH Patel Institute of Pharmacy, Vallabh Vidyanagar, Gujarat, India. rajeshrrd@yahoo.com

AAPS Pharmscitech
|June 17, 2004
PubMed
Summary

This study optimized chitosan microsphere formulation by adjusting chitosan concentration and stirring speed. Optimal conditions yielded spherical microspheres with high drug loading and controlled release profiles for 5-fluorouracil and methotrexate.

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Area of Science:

  • Materials Science
  • Pharmaceutical Sciences
  • Biotechnology

Background:

  • Chitosan microspheres are promising drug delivery vehicles.
  • Optimizing formulation parameters is crucial for effective drug encapsulation and release.

Purpose of the Study:

  • To optimize chitosan concentration, stirring speed, and drug concentration for chitosan microsphere formulation.
  • To characterize the physicochemical properties and in vitro drug release of prepared microspheres.

Main Methods:

  • Chemical denaturation method used for chitosan microsphere preparation.
  • Morphology, particle size, drug entrapment, drug loading, and in vitro drug release were evaluated.
  • Process parameters like chitosan concentration and stirring speed were systematically varied.

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Main Results:

  • Microsphere morphology and particle size were significantly influenced by chitosan concentration and stirring speed.
  • Spherical microspheres with a mean particle size of 12.68 microm were achieved under optimized conditions (2 mg/mL chitosan, 3000 rpm).
  • High drug loading was observed for both 5-fluorouracil (50.63 μg/mg) and methotrexate (13.84 μg/mg), with distinct release kinetics for each drug.

Conclusions:

  • Optimized formulation parameters are key to producing chitosan microspheres with desired characteristics.
  • Chitosan microsphere properties and drug loading are influenced by drug solubility.
  • The study provides a foundation for developing chitosan microsphere-based drug delivery systems.