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Related Experiment Videos

Sustained release chitosan microspheres prepared by novel spray drying methods.

P He1, S S Davis, L Illum

  • 1Department of Pharmaceutical Science, University of Nottingham, UK.

Journal of Microencapsulation
|May 26, 1999
PubMed
Summary

Novel emulsion-spray drying methods create chitosan microspheres for sustained drug release. These microspheres significantly slow the release of drugs like cimetidine and famotidine over several hours.

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Area of Science:

  • Materials Science
  • Pharmaceutical Technology
  • Drug Delivery

Background:

  • Conventional methods for preparing drug-loaded microspheres often result in rapid drug release.
  • Chitosan microspheres are investigated for their potential in controlled drug delivery applications.

Purpose of the Study:

  • To develop modified spray drying techniques for chitosan microspheres with sustained drug release.
  • To evaluate the drug release patterns of cimetidine and famotidine from these novel microspheres.

Main Methods:

  • Development of a novel water-in-oil-in-water (w/o/w) emulsion-spray drying method.
  • Preparation of chitosan microspheres loaded with model drugs (cimetidine, famotidine).
  • Comparison of drug release from microspheres prepared by conventional spray drying, emulsion methods, and the novel emulsion-spray drying method.

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Main Results:

  • The w/o/w emulsion-spray drying method produced chitosan microspheres exhibiting significantly retarded drug release over several hours.
  • Drug release from microspheres prepared by conventional methods was nearly instantaneous.
  • Poor wetting ability of microspheres contributed to slow release, which was enhanced by wetting agents.
  • Gelatin coating further decreased drug release rates in the presence of wetting agents.

Conclusions:

  • The novel w/o/w emulsion-spray drying technique is effective for creating chitosan microspheres with sustained drug release properties.
  • Microsphere characteristics, such as wetting ability and surface coating, significantly influence drug release kinetics.
  • This method offers a promising approach for developing long-acting drug formulations.