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Related Experiment Videos

Liquid-phase microextraction of basic drugs--selection of extraction mode based on computer calculated solubility

Stig Pedersen-Bjergaard1, Knut Einar Rasmussen, Anders Brekke

  • 1School of Pharmacy, University of Oslo, Blindern, Oslo, Norway. stig.pedersen-bjergaard@farmasi.uio.no

Journal of Separation Science
|August 25, 2005
PubMed
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This study optimized basic drug extraction using three-phase liquid-phase microextraction (LPME). Drug solubility and log D values predict successful extraction, guiding method development for various samples, including plasma.

Area of Science:

  • Analytical Chemistry
  • Separation Science

Background:

  • Liquid-phase microextraction (LPME) is a versatile technique for sample preparation.
  • Understanding drug physicochemical properties is crucial for optimizing extraction efficiency.

Purpose of the Study:

  • To investigate the extractability of basic drugs using three-phase LPME.
  • To correlate extraction recoveries with drug solubility and log D values.
  • To predict the extractability of new compounds and optimize method development.

Main Methods:

  • Three-phase LPME using dodecyl acetate as the organic phase and HCl as the acceptor solution.
  • Correlation of extraction recoveries with calculated solubility and log D data.
  • Investigation of carrier-mediated LPME with octanoic acid for specific drug classes.

Related Experiment Videos

  • Application of the method to plasma samples.

    • Main Results:

    • Drugs with solubility < 1 mg/mL showed poor recovery; two-phase LPME is suggested as an alternative.
    • Effective extraction (>30% recovery) was achieved for drugs with solubility between 1-5 mg/mL and 5-150 mg/mL using three-phase LPME.
    • For hydrophilic drugs (solubility > 150 mg/mL), three-phase LPME was effective only for log D > 1.8; carrier-mediated LPME was preferred for log D < 1.8.
    • Plasma sample analysis demonstrated the effectiveness of dilution and pH adjustment to mitigate drug-protein interactions.

    Conclusions:

    • Drug solubility and log D are key predictors for three-phase LPME efficiency.
    • Three-phase LPME is highly effective for a wide range of basic drugs.
    • Carrier-mediated LPME and optimized sample preparation enhance extraction for challenging compounds and matrices like plasma.