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Related Experiment Videos

Reduction of extraction times in liquid-phase microextraction.

T Grønhaug Halvorsen1, S Pedersen-Bjergaard, K E Rasmussen

  • 1School of Pharmacy, University of Oslo, Norway. t.g.halvorsen@farmasi.uio.no

Journal of Chromatography. B, Biomedical Sciences and Applications
|September 4, 2001
PubMed
Summary

This study optimized porous hollow fiber liquid-phase microextraction (LPME) for faster drug analysis. Increased fiber surface area significantly reduced extraction times from biological samples like urine, plasma, and whole blood.

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Area of Science:

  • Analytical Chemistry
  • Forensic Toxicology

Background:

  • Liquid-phase microextraction (LPME) using porous hollow fibers offers a simple and cost-effective method for sample preparation.
  • Previous methods required longer extraction times, limiting throughput.

Purpose of the Study:

  • To significantly reduce extraction times for LPME by increasing the surface area of porous polypropylene hollow fibers.
  • To evaluate the efficiency of LPME for extracting model drugs from various biological matrices, including whole blood.

Main Methods:

  • Comparison of two commercially available porous polypropylene hollow fibers with different surface areas.
  • Optimization of extraction parameters including sample matrix (urine, plasma, whole blood), dilution, alkalization, and acceptor phase.
  • Analysis of model compounds (methamphetamine and citalopram) using the optimized LPME technique.

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Main Results:

  • Increasing the hollow fiber surface area by approximately two-fold reduced equilibrium extraction times by a similar factor.
  • Equilibrium was achieved within 15 minutes for urine and plasma, and 30 minutes for whole blood.
  • Extraction recoveries ranged from 60% to 100% for methamphetamine and citalopram across different matrices and fiber types.

Conclusions:

  • Optimized porous hollow fiber LPME allows for rapid and efficient extraction of drugs from urine, plasma, and for the first time, whole blood.
  • The method provides comparable sample clean-up and extraction recoveries to plasma, demonstrating its versatility.
  • This technique offers a faster and effective approach for drug analysis in forensic and clinical toxicology.