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Solid-phase extraction and GC/MS confirmation of barbiturates from human urine
Journal of Analytical Toxicology
|January 1, 1992
Summary
A new method efficiently isolates and identifies barbiturates in urine using solid-phase extraction and GC/MS. This technique offers high accuracy for detecting these drugs in biological samples.
Area of Science:
- Forensic Toxicology
- Analytical Chemistry
Background:
- Barbiturate detection in urine is crucial for clinical and forensic toxicology.
- Existing methods may lack the sensitivity or selectivity required for accurate quantification.
Purpose of the Study:
- To develop a highly selective and sensitive method for isolating and identifying barbiturates in human urine.
- To establish a reliable analytical procedure for barbiturate quantitation in biological matrices.
Main Methods:
- Solid-phase extraction (SPE) using a novel disposable bonded silica gel column.
- Internal standard (IS) calibration with hexobarbital.
- Capillary gas chromatography/ion trap mass spectrometry (GC/MS) for detection and identification.
Main Results:
- Selective isolation of amobarbital, butabarbital, pentobarbital, phenobarbital, secobarbital, and methaqualone.
- Linear quantitative response curves achieved over a 20-500 ng/mL concentration range.
- High extraction efficiencies (>90%) and excellent linearity (R² = 0.996–0.999).
Conclusions:
- The developed SPE-GC/MS procedure is highly effective for barbiturate analysis in human urine.
- This method provides sensitive, selective, and accurate quantitation of common barbiturates.
- The technique is suitable for routine toxicological screening and monitoring.