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Recently, the analysis of drugs of abuse in human hair has received much attention, primarily as it allows for the determination of long-term trends in drug usage. The analysis of delta-9-tetrahydrocannabinol (THC), the active ingredient of cannabis, and one of its human metabolites 11-nor-delta-9-THCCOOH (THC-COOH) in human hair currently requires solvent extraction of a quantity of hair, concentration of the extract by SPE, derivatisation with BSTFA followed by GC/MS analysis. Using large volume injection with in-liner derivatisation reduces sample preparation and lowers the detection limits.
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