An Improved GC-MS/MS Method for a Fast Multidrug Analysis in Hair

Area of Science:

• Forensic Toxicology
• Analytical Chemistry
• Pharmacology

Background:

• Hair drug testing is crucial for long-term substance abuse monitoring.
• Existing methods can be time-consuming and require large sample volumes.
• A need exists for efficient, multi-drug analysis in hair samples.

Purpose of the Study:

• To develop and validate a semi-automated method for simultaneous multi-drug analysis in hair.
• To utilize gas chromatography-tandem mass spectrometry (GC-MS/MS) for enhanced sensitivity and specificity.
• To improve the efficiency of hair analysis in routine forensic laboratories.

Main Methods:

• Semi-automated sample preparation including decontamination and pulverization.
• Supported-liquid extraction (SLE) for sample clean-up.
• Two-step derivatization followed by GC-MS/MS analysis for drug detection and quantification.

Main Results:

• Validated method demonstrates linearity from 0.05-5 ng/mg for most drugs.
• Achieved limits of quantification (LOQ) as low as 0.05 ng/mg and limits of detection (LOD) as low as 0.025 ng/mg.
• Accuracy and precision within ±20%, confirmed by proficiency testing.

Conclusions:

• The developed GC-MS/MS method provides accurate and precise simultaneous quantification of multiple drugs in hair.
• The semi-automated procedure significantly enhances laboratory efficiency, reducing turnaround time and sample requirements.
• This validated method is suitable for routine hair analysis in forensic toxicology.