PMID: 12742687May 14, 2003

Automated headspace solid-phase dynamic extraction for the determination of cannabinoids in hair samples

Forensic Science International : Synergy
Frank MusshoffBurkhard Madea

Abstract

This article describes a fully automated procedure for detecting cannabinoids in human hair samples. The procedure uses alkaline hydrolysis and headspace solid-phase dynamic extraction (HS-SPDE), followed by on-coating derivatization and gas chromatography-mass spectrometry (GC-MS). SPDE is a further development of solid-phase microextraction (SPME), based on an inside needle capillary absorption trap. It uses a hollow needle with an internal coating of polydimethylsiloxane as extraction and pre-concentration medium. Ten mg of hair were washed with deionised water, petroleum ether and dichloromethane. After adding deuterated internal standards, the sample was hydrolyzed with sodium hydroxide and directly submitted to HS-SPDE. After absorption of analytes for an on-coating derivatization procedure, the SPDE-needle was directly placed into the headspace of a second vial containing N-methyl-N-trimethylsilyl-trifluoroacetamide before GC-MS analysis. The limit of detection was 0.14 ng/mg for Delta(9)-tetrahydrocannabinol, 0.09 ng/mg for cannabidiol, and 0.12ng/mg for cannabinol. Absolute recoveries were in the range of 0.6 to 8.4%. Linearity was verified over a range from 0.2 to 20 ng/mg, with coefficients of correlation between 0.9...Continue Reading

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Related Concepts

Cannabinoids
Petroleum distillate
Tetrahydrocannabinol
Downy Hair
Gas Chromatography-Mass Spectrometry
Cannabinol
Legal Medicine Discipline
Cannabidiol
Entire Capillary Blood Vessel (Organ)
Polydimethylsiloxane

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