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Analysis of initial burst in PLGA microparticles.

S Dean Allison1

  • 1South Carolina College of Pharmacy, Department of Pharmaceutical and Biomedical Sciences, Columbia, SC 29205, USA. allison@cop.sc.edu

Expert Opinion on Drug Delivery
|June 6, 2008
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Controlling initial burst release from poly(lactide-co-glycolide) (PLGA) microparticles is crucial for safe and effective drug delivery. Strategies focus on improving drug-polymer miscibility and optimizing processing methods to reduce premature drug expulsion.

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Area of Science:

  • Biomaterials Science
  • Drug Delivery Systems
  • Polymer Chemistry

Background:

  • Poly(lactide-co-glycolide) (PLGA) microparticles are widely used for sustained drug delivery.
  • Excessive initial burst release can lead to drug toxicity and inconsistent dosing.
  • Poor drug-polymer miscibility is a key challenge in PLGA microparticle formulations.

Purpose of the Study:

  • To review recent advances in understanding burst release mechanisms from PLGA microparticles.
  • To summarize strategies for controlling burst release in PLGA formulations.

Main Methods:

  • Literature review focusing on publications since 2004.
  • Analysis of formulation and processing strategies to mitigate burst release.

Main Results:

  • Strategies involve enhancing drug-polymer miscibility (e.g., altering drug salt form).
  • Processing modifications, such as controlled solvent removal, can prevent drug-polymer separation.
  • The primary goal is to minimize burst release for improved drug retention.

Conclusions:

  • Understanding burst release mechanisms is key to developing effective control strategies.
  • Formulation and processing adjustments offer viable methods to reduce premature drug release from PLGA microparticles.
  • Optimizing these strategies ensures better drug retention for sustained therapeutic effects.