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Development and optimization of a solid dispersion hot-melt fluid bed coating method

J P Kennedy1, P J Niebergall

  • 1International Processing Corporation, Winchester, Kentucky 40391, USA.

Pharmaceutical Development and Technology
|April 1, 1996
PubMed
Summary
This summary is machine-generated.

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A novel hot-melt fluid bed coating process efficiently coats particles and tablets without organic solvents. This innovative method offers a viable alternative to traditional spray-coating techniques, enhancing process safety and sustainability.

Area of Science:

  • Pharmaceutical Technology
  • Materials Science
  • Chemical Engineering

Background:

  • Traditional hot-melt coating processes often involve organic solvents and complex equipment.
  • Developing solvent-free coating methods is crucial for environmental and safety reasons.
  • Fluid bed coating offers potential for uniform particle coating.

Purpose of the Study:

  • To develop and optimize a new hot-melt fluid bed coating process.
  • To characterize the process using polyethylene glycol as a model coating agent.
  • To evaluate the method's applicability for coating various substrates.

Main Methods:

  • A hot-melt fluid bed coating process was developed, involving solid-state charging and four distinct processing stages: warm-up, preheating, melting-spreading, and cooling-congealing.

Related Experiment Videos

  • A central composite design was employed for process characterization and optimization.
  • Substrate porosity and density were analyzed using mercury intrusion.

    • Main Results:

    • The process successfully coated nonpareils (10-35 mesh) and tablets (up to 1 g) as individual particles.
    • Particle agglomeration occurred with sizes smaller than 40 mesh.
    • Variations in substrate porosity and density impacted process reproducibility.
    • Additive coatings were achieved by sequential application of agents with decreasing melting points.

    Conclusions:

    • The developed hot-melt fluid bed coating method is a viable, solvent-free alternative to hot-melt spray coating.
    • The process eliminates the need for organic solvents, spraying equipment, steam jackets, and heating tape.
    • Further optimization is needed to address reproducibility issues related to substrate variations.