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Related Experiment Videos

Time-dependent densification behaviour of cyclodextrins

A Muñoz-Ruiz1, P Paronen

  • 1Department of Pharmaceutics, University of Kuopio, Finland.

The Journal of Pharmacy and Pharmacology
|August 1, 1996
PubMed
Summary
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Understanding cyclodextrin powder properties is key for tablet formulation. Different cyclodextrins exhibit unique deformation behaviors under compression, influencing tablet quality and capping tendencies.

Area of Science:

  • Pharmaceutical Sciences
  • Materials Science
  • Chemical Engineering

Background:

  • Robust cyclodextrin tablet formulations require understanding volume reduction mechanisms.
  • Particle and powder properties significantly influence tabletability.
  • Cyclodextrins (alpha-, beta-, gamma-, and hydroxypropyl beta-) exhibit diverse physical characteristics.

Purpose of the Study:

  • To examine the particle and powder properties of various cyclodextrins.
  • To investigate their behavior under compression, focusing on densification and deformation.
  • To correlate these properties with tablet formulation performance, particularly capping tendency.

Main Methods:

  • Analysis of particle-size distribution and particle shape.
  • Compression studies using a compaction simulator with single-sided saw-tooth displacement-time profiles at varying rates (3 and 300 mm s-1).

Related Experiment Videos

  • Heckel treatment (tablet-in-die and ejected-tablet methods) to assess powder densification and deformation characteristics.

    • Main Results:

    • Highest densification on tapping observed for cyclodextrins with the smallest particle size.
    • Increased initial densification at higher compression velocities.
    • Ranking of deformation tendency: HP-beta-cyclodextrin > beta-cyclodextrin > gamma-cyclodextrin > alpha-cyclodextrin.
    • All cyclodextrins showed high susceptibility to plastic deformation and time-dependent consolidation.
    • HP-beta-cyclodextrin and beta-cyclodextrin demonstrated higher fast elastic recovery, correlating with punch velocity.

    Conclusions:

    • Cyclodextrin properties like particle size and shape critically impact compression behavior.
    • Strain-rate sensitivity and elastic recovery are important parameters for predicting tabletability and capping.
    • The study provides a basis for categorizing pharmaceutical materials based on their elastic recovery ratio for predicting capping tendency.