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Related Experiment Videos

5-fluorouracil loaded chitosan microspheres for chemoembolization.

E B Denkbaş1, M Seyyal, E Pişkin

  • 1Chemistry Department, Hacettepe University, Ankara, Turkey.

Journal of Microencapsulation
|November 27, 1999
PubMed
Summary

This study developed controllable chitosan microspheres for chemoembolization. Researchers optimized particle size and drug loading of 5-fluorouracil (5-FU) for potential cancer treatment applications.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Drug Delivery Systems

Background:

  • Chitosan microspheres are promising for drug delivery.
  • Controlling microsphere size and drug loading is crucial for targeted therapies like chemoembolization.

Purpose of the Study:

  • To prepare and characterize chitosan microspheres loaded with 5-fluorouracil (5-FU) using a suspension cross-linking technique.
  • To investigate the influence of preparation parameters on microsphere size and drug loading.
  • To evaluate the in vitro drug release profile of 5-FU from the chitosan microspheres.

Main Methods:

  • Chitosan microspheres were synthesized via suspension cross-linking using a petroleum ether/mineral oil mixture and Tween-80.
  • Glutaraldehyde was employed as the cross-linker.

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  • 5-Fluorouracil (5-FU) was incorporated into the chitosan matrix.
  • Microsphere size, size distribution, and drug loading capacity were analyzed.
  • In vitro drug release studies were conducted over 24 hours.

    • Main Results:

    • Chitosan microspheres in the 100-200 micron range were successfully prepared.
    • Increased emulsifier concentration and stirring rate led to decreased microsphere size and narrower size distribution.
    • Lower chitosan/solvent and drug/chitosan ratios resulted in smaller microspheres with improved size uniformity.
    • A drug loading capacity of 10.4 mg 5-FU/g chitosan was achieved.
    • Approximately 60% of the loaded 5-FU was released within the initial 24 hours, followed by a slower release rate.

    Conclusions:

    • The suspension cross-linking technique allows for controlled preparation of chitosan microspheres for chemoembolization.
    • Preparation parameters significantly impact microsphere characteristics, enabling tunable size and drug loading.
    • The developed 5-FU-loaded chitosan microspheres exhibit a biphasic release pattern suitable for sustained drug delivery.