title: Screening and quantitative determination of twelve acidic and neutral pharmaceuticals in whole blood by liquid-liquid extraction and liquid chromatography-tandem mass spectrometry.
abstract: We describe a multi-method for simultaneous identification and quantification of 12 acidic and neutral compounds in whole blood. The method involves a simple liquid-liquid extraction, and the identification and quantification are performed using liquid chromatography-tandem mass spectrometry. The method was fully validated for salicylic acid, paracetamol, phenobarbital, carisoprodol, meprobamate, topiramate, etodolac, chlorzoxazone, furosemide, ibuprofen, warfarin, and salicylamide. The method also tentatively includes thiopental, theophylline, piroxicam, naproxen, diclophenac, and modafinil, but these drugs were not included in the full validation program and are not described in detail here. Limit of quantitation was 1 mg/kg for the compounds with coefficients of variation of < 20%, except for furosemide, which had a coefficient of variation of 32% at limit of quantitation. The measuring interval was wide for most components. Extraction efficiencies were high, reflecting the high-yield capacity of the method.
authors.affiliation: Section of Forensic Chemistry, Department of Forensic Medicine, Faculty of Health Sciences, University of Copenhagen, Frederik Den Femtes Vej 11, DK-2100 Copenhagen, Denmark. Kirsten.wiese@forensic.ku.dk
authors.forename: Kirsten Wiese
authors.initials: KW
authors.lastname: Simonsen
authors.forename: Anni
authors.initials: A
authors.lastname: Steentoft
authors.forename: Maike
authors.initials: M
authors.lastname: Buck
authors.forename: Lene
authors.initials: L
authors.lastname: Hansen
authors.forename: Kristian
authors.initials: K
authors.lastname: Linnet
mesh_terms: D001774:Blood Chemical Analysis / Q000379:methods; D005591:Chemical Fractionation; D002853:Chromatography, Liquid; D005554:Forensic Medicine / Q000379:methods; D006801:Humans; D006863:Hydrogen-Ion Concentration; D004364:Pharmaceutical Preparations / Q000097:blood*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D015813:Substance Abuse Detection / Q000379:methods*; D053719:Tandem Mass Spectrometry
chemical_list: D004364:Pharmaceutical Preparations