Testing for basic drugs in biological fluids by solvent extraction and dual capillary GC/NPD

Area of Science:

• Clinical Chemistry
• Analytical Chemistry
• Forensic Toxicology

Background:

• Accurate quantification of basic drugs in biological samples is crucial for clinical diagnosis and forensic analysis.
• Existing methods may have limitations in sensitivity, specificity, or sample volume requirements.

Purpose of the Study:

• To develop and validate a robust method for the extraction and gas chromatographic analysis of basic drugs.
• To assess the reliability of the method for quantifying drugs in various biological fluids, including serum and urine.

Main Methods:

• Solid-phase extraction of basic drugs from serum, urine, and other biological fluids.
• Back-extraction and re-extraction into a chloroform:isoamyl alcohol solvent system.
• Analysis using temperature-programmed gas chromatography with nitrogen phosphorus detection (NPD).

Main Results:

• The method demonstrated reliable quantification of several basic drugs in 388 serum samples from suspected overdose patients.
• Successful application of the extraction technique to a variety of body fluids using a packed column.
• High sensitivity and specificity achieved with dual nitrogen phosphorus detectors.

Conclusions:

• The developed gas chromatography method provides a reliable and efficient means for basic drug quantification in biological matrices.
• This technique is suitable for routine toxicological screening and clinical monitoring in overdose cases.
• The method's adaptability to different body fluids enhances its utility in forensic and clinical settings.