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Related Experiment Videos

Optimization of a fluid bed spray coating process using reduced factorial design.

M E Johansson1, A Ringberg, M Nicklasson

  • 1Astra Alab AB, Research & Development Laboratories, Pharmaceutics Solid Systems, Södertälje, Sweden.

Journal of Microencapsulation
|July 1, 1987
PubMed
Summary

Optimizing the fluid bed coating process for controlled-release pellets revealed a critical film yield limit. Below 75% film yield, agglomeration is minimal; exceeding this threshold causes significant pellet clumping.

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Area of Science:

  • Pharmaceutical Technology
  • Chemical Engineering
  • Materials Science

Background:

  • Controlled-release drug delivery systems often utilize coated pellets.
  • Fluid bed coating is a common technique for applying these coatings.
  • Process optimization is crucial for achieving desired drug release profiles and product quality.

Purpose of the Study:

  • To optimize the fluid bed coating process for controlled-release pellets using organic solvents and ethylcellulose.
  • To identify key process variables affecting film yield and pellet agglomeration.
  • To establish a relationship between film yield and the degree of pellet agglomeration.

Main Methods:

  • Sequential optimization using reduced factorial experimental designs (2(4-1) and 2(3-1) experiments).

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  • Focus on variables with the most significant impact on film yield.
  • Analysis of the relationship between film yield and degree of agglomeration.

    • Main Results:

    • A limiting film yield of approximately 75% was identified.
    • Below this limit, pellet agglomeration is minimal.
    • Above 75% film yield, a dramatic increase in agglomeration occurs.
    • The critical limit value showed minor variations with experimental conditions.

    Conclusions:

    • The study established a critical film yield threshold for fluid bed coating of controlled-release pellets.
    • Maintaining film yield below 75% is essential to minimize pellet agglomeration.
    • This finding provides valuable guidance for optimizing ethylcellulose coating processes.