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Development and characterization of microencapsulated microspheres

A Göpferich1, M J Alonso, R Langer

  • 1Department of Pharmaceutical Technology, Universität Erlangen-Nürnberg, Germany.

Pharmaceutical Research
|November 1, 1994
PubMed
Summary
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This study details a method for coating polymer microspheres with various polymers, confirmed by microscopy and spectroscopy. The coating process was validated for potential pharmaceutical applications, including drug release modulation.

Area of Science:

  • Polymer Science
  • Materials Science
  • Nanotechnology

Background:

  • Polymer microspheres are versatile carriers in drug delivery and other applications.
  • Controlling the surface properties and release kinetics of microspheres is crucial for their efficacy.
  • Developing robust methods for coating microspheres is essential for advanced material design.

Purpose of the Study:

  • To describe a novel process for coating polymer microspheres with identical or different polymers.
  • To characterize the coated microspheres using various physicochemical methods.
  • To evaluate the impact of polymer coating on the release profile of encapsulated substances, such as tetanus toxoid.

Main Methods:

  • Manufacturing coated microspheres from both degradable and non-degradable polymers.

Related Experiment Videos

  • Utilizing polarized light microscopy to observe birefringence and Maltese Cross patterns.
  • Employing fluorescent dyes for differential staining of core and coating.
  • Analyzing microstructure via cryomicrotomy.
  • Determining surface composition using Electron Spectroscopy for Chemical Analysis (ESCA).

    • Main Results:

    • Physicochemical characterization confirmed complete coating of polymer microspheres.
    • Polarized light microscopy revealed distinct Maltese Cross formations, indicative of successful coating.
    • Fluorescent dye staining demonstrated uneven distribution, verifying coating integrity.
    • ESCA analysis of carbon and oxygen content validated the completeness of the coating procedure.
    • Coating significantly altered the release rate of tetanus toxoid from polylactide microspheres.

    Conclusions:

    • The described coating process is effective for both degradable and non-degradable polymer microspheres.
    • Multiple analytical techniques confirm the successful and complete coating of the microspheres.
    • Polymer coating offers a viable strategy to control the release kinetics of encapsulated active agents, showing promise for pharmaceutical applications.