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Elevated temperature accelerated release testing of PLGA microspheres.

Banu S Zolnik1, Pauline E Leary, Diane J Burgess

  • 1Department of Pharmaceutical Sciences, University of Connecticut, Storrs, CT 06269, USA.

Journal of Controlled Release : Official Journal of the Controlled Release Society
|April 29, 2006
PubMed
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Poly(lactic-co-glycolic) acid (PLGA) microsphere drug release kinetics were studied using accelerated testing. Elevated temperatures predicted real-time release, with molecular weight changes following first-order kinetics.

Area of Science:

  • Polymer science
  • Materials science
  • Pharmaceutical sciences

Background:

  • Poly(lactic-co-glycolic) acid (PLGA) microspheres are widely used for controlled drug delivery.
  • Understanding drug release kinetics under various conditions is crucial for formulation development.
  • Accelerated stability testing can predict long-term drug release profiles.

Purpose of the Study:

  • To evaluate drug release from different PLGA microsphere formulations under real-time and accelerated conditions.
  • To investigate the impact of temperature and flow rate on PLGA microsphere degradation and drug release.
  • To predict real-time drug release profiles using accelerated testing data and the Arrhenius equation.

Main Methods:

  • Utilized United States Pharmacopeia (USP) apparatus 4 for drug release studies.

Related Experiment Videos

  • Employed accelerated conditions including elevated temperatures (45-70°C) and increased flow rates (4-35 ml/min).
  • Monitored drug release rates, molecular weight changes (gel permeation chromatography), and morphological alterations.

    • Main Results:

    • Low molecular weight PLGA microspheres (5 K) showed diffusion-controlled release, while medium/high molecular weight formulations (25 K, 28 K, 70 K) exhibited erosion-controlled release at 37°C.
    • Accelerated temperature testing correlated with real-time release, allowing prediction via the Arrhenius equation (activation energy: 19.14 kcal/mol).
    • Elevated temperatures induced morphological changes, reducing burst release and affecting molecular weight via first-order kinetics.

    Conclusions:

    • Accelerated release testing effectively predicts real-time drug release from PLGA microspheres.
    • PLGA molecular weight significantly influences drug release kinetics (diffusion vs. erosion).
    • Temperature-induced degradation affects microsphere morphology and drug release behavior, offering insights for formulation optimization.