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Related Experiment Videos

Evaluation of biodegradable poly(lactide) pellets prepared by direct compression.

R Bodmeier1, H G Chen

  • 1College of Pharmacy, University of Texas, Austin 78712-1074.

Journal of Pharmaceutical Sciences
|October 1, 1989
PubMed
Summary

Biodegradable drug delivery pellets were made using poly(DL-lactide) and poly(L-lactide) via direct compression. Molecular weight and endgroups influenced drug release and matrix behavior in different pH environments.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Pharmaceutical Technology

Background:

  • Biodegradable polymers are crucial for drug delivery systems.
  • Poly(lactide) (PLA) is a widely used biodegradable polymer.
  • Controlling PLA properties is key for tailored drug release.

Purpose of the Study:

  • To prepare biodegradable pellets from low and high molecular weight poly(lactide) (PLA) using direct compression.
  • To investigate the influence of PLA molecular weight and endgroup chemistry on pellet properties and drug release.
  • To evaluate the pH-dependent behavior and drug-polymer interactions in PLA matrices.

Main Methods:

  • Direct compression of low molecular weight poly(DL-lactide) (low MW PLA) and high molecular weight poly(L-lactide) (L-PLA) without heat or solvents.

Related Experiment Videos

  • Swelling and erosion studies in pH 7.4 buffer and 0.1 M HCl.
  • Drug release studies using basic drugs (quinidine sulfate, propranolol hydrochloride).
  • Modification of drug release by admixing sodium chloride or dipping in methylene chloride.

    • Main Results:

    • Successful preparation of PLA pellets via direct compression, with particle fusion in low MW PLA.
    • Low MW PLA pellets exhibited pH-dependent behavior, acting as an enteric matrix.
    • Drug release from low MW PLA pellets was retarded due to interactions with basic drugs.
    • L-PLA pellets showed pH-independent drug release without significant drug-polymer interactions.
    • Drug release was modulated by admixing NaCl or methylene chloride treatment.

    Conclusions:

    • Direct compression is a viable method for preparing biodegradable PLA pellets for drug delivery.
    • PLA molecular weight and carboxyl endgroup content significantly impact matrix swelling, erosion, and drug release kinetics.
    • PLA matrices can be engineered for controlled release, with potential for enteric delivery and tunable drug-polymer interactions.