Three-phase liquid-phase microextraction of weakly basic drugs from whole blood

Area of Science:

• Analytical Chemistry
• Forensic Toxicology

Background:

• Liquid-phase microextraction (LPME) is a sample preparation technique.
• Weakly basic drugs, such as benzodiazepines, present challenges in LPME due to matrix complexity and incomplete analyte trapping.
• Optimizing LPME for complex matrices like whole blood is crucial for accurate drug analysis.

Purpose of the Study:

• To optimize parameters for liquid-phase microextraction (LPME) of weak basic analytes from whole blood.
• To investigate factors affecting the recovery and stability of model drugs (benzodiazepines and non-benzodiazepine drugs) during LPME.
• To evaluate parameters limiting extraction efficiency in whole blood samples.

Main Methods:

• Utilized three-phase liquid-phase microextraction (LPME) with disposable polypropylene hollow fibres.
• Employed benzodiazepines and non-benzodiazepine drugs as model weak basic analytes.
• Experimentally studied and optimized various parameters influencing extraction efficiency and analyte stability.

Main Results:

• Identified and optimized critical parameters for LPME of weak bases in whole blood.
• Addressed issues of low recovery caused by incomplete trapping and matrix complexity.
• Confirmed analyte stability under low pH acceptor phase conditions.

Conclusions:

• Developed optimized LPME conditions for the effective extraction of weak bases from whole blood.
• Successfully evaluated parameters that limit recovery in this complex biological matrix.
• The optimized method provides a foundation for improved analysis of weak basic drugs in forensic and clinical settings.