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Related Experiment Videos

Supercritical fluid extraction-liquid chromatography method development for a polymeric controlled-release drug

D A Roston1, J J Sun, P W Collins

  • 1Searle Research and Development, Skokie, Illinois 60077, USA.

Journal of Pharmaceutical and Biomedical Analysis
|November 1, 1995
PubMed
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We developed a supercritical fluid extraction (SFE) method to assay active misoprostol in controlled-release polymer formulations. This optimized SFE method ensures accurate quantification of the drug substance for quality control.

Area of Science:

  • Pharmaceutical Sciences
  • Analytical Chemistry
  • Materials Science

Background:

  • Controlled-release drug formulations require precise analytical methods for active component assay.
  • Misoprostol, a prostaglandin analog, is the active enantiomer in Cytotec and used in polymer-based drug delivery systems.
  • Accurate quantification of active pharmaceutical ingredients in complex matrices is crucial for drug development and quality control.

Purpose of the Study:

  • To develop and optimize a supercritical fluid extraction (SFE) method for assaying misoprostol in a controlled-release polymer formulation.
  • To systematically evaluate SFE parameters for efficient drug recovery and sample preparation.
  • To validate the developed method for accurate quantification of the active drug substance.

Main Methods:

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  • Dynamic, off-line supercritical fluid extraction (SFE) was employed for sample preparation.
  • Extracted samples were analyzed using normal-phase and reversed-phase High-Performance Liquid Chromatography (HPLC).
  • Reversed-phase HPLC incorporated postcolumn reaction for selective detection of prostaglandin components.

Main Results:

  • Optimized SFE conditions were established by investigating parameters like sample quantity, extraction duration, CO2 modifier, temperature, and pressure.
  • Preliminary validation using radiolabeled misoprostol confirmed high drug recovery and good precision under optimized SFE conditions.
  • The method was successfully applied to quantitate active misoprostol and related compounds in experimental polymeric formulations.

Conclusions:

  • Supercritical fluid extraction (SFE) provides an effective and efficient sample preparation technique for assaying active misoprostol in controlled-release polymer formulations.
  • The developed SFE-HPLC method enables accurate quantification of the drug substance, supporting quality control and development of such formulations.
  • This analytical approach is valuable for characterizing complex drug delivery systems containing covalently bonded active pharmaceutical ingredients.