title: Simultaneous quantification of opiates, amphetamines, cocaine and metabolites and diazepam and metabolite in a single hair sample using GC-MS.
abstract: A method is described for the simultaneous identification and quantification of opiates, amphetamines, cocainics, diazepam and nordiazepam from one hair extract (typically 10-50mg hair). After decontamination by washing with shampoo, dichloromethane, isopropanol and acetone, drugs were extracted using 0.1M HCl followed by SPE clean-up using mixed-mode extraction cartridges. The SPE extracts were submitted to a two-step derivatisation using MBTFA and MSTFA+1% TCMS and analysis was performed by GC-MS using both SIM and scan modes. Four deuterated standards were used to monitor 14 compounds. The limit of quantification was the total drug detected from the sample. This was 5 ng for amphetamines and 10 ng for remaining drugs which is equivalent to 0.1 and 0.2 ng/mg from a 50mg sample. Standard curves for the range 5-400 ng total drug concentration for all drugs had regression coefficients greater than 0.98. An authentic hair sample was used to validate the method and gave R.S.D.s <25% for both inter and intra-day reproducibility. The results of the analysis of hair taken from four patients attending a drug treatment clinic and six hair samples including head hair, pubic hair, axial hair and beard taken at post-mortem are presented.
authors.affiliation: Toxicology Unit, Imperial College London, St. Dunstan's Road, London W6 8RP, United Kingdom.
authors.forename: Rosa
authors.initials: R
authors.lastname: Cordero
authors.forename: Sue
authors.initials: S
authors.lastname: Paterson
mesh_terms: D000661:Amphetamine / Q000032:analysis* / Q000378:metabolism; D003042:Cocaine / Q000032:analysis* / Q000378:metabolism; D003975:Diazepam / Q000032:analysis* / Q000378:metabolism; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D006197:Hair / Q000737:chemistry*; D006801:Humans; D018847:Opioid Peptides / Q000032:analysis* / Q000378:metabolism; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D015813:Substance Abuse Detection / Q000379:methods
chemical_list: D018847:Opioid Peptides; D000661:Amphetamine; D003042:Cocaine; D003975:Diazepam