Premium
Identification and quantification of 30 antipsychotics in blood using LC‐MS/MS
Author(s) -
Saar Eva,
Gerostamoulos Dimitri,
Drummer Olaf H.,
Beyer Jochen
Publication year - 2010
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/jms.1783
Subject(s) - chemistry , chromatography , formic acid , ammonium formate , sample preparation , high performance liquid chromatography , selected reaction monitoring , solvent , mass spectrometry , tandem mass spectrometry , organic chemistry
Over the last decade, the prescription rates of antipsychotic (AP) drugs have increased worldwide. Studies have shown that the risk of sudden cardiac death is threefold higher among patients treated with APs. To investigate the presence of APs in postmortem cases, a liquid chromatography (LC)‐MS/MS method was developed using only 0.1 ml of blood sample with 10 µl of internal standard (IS) (haloperidol‐ d 4 , 1 µg/ml). After the addition of 0.2 ml of Trizma buffer, the blood sample was extracted using liquid–liquid extraction (LLE) with 1 ml of 1‐chlorobutane for 5 min on a shaker at 1500 rpm. After centrifugation at 12 000 rpm for 1 min, the separated solvent layer was transferred to an autosampler vial and evaporated to dryness under N 2 . The residue was reconstituted in 0.05 ml acetonitrile containing 0.1% formic acid, vortexed for 30 s and an additional 0.45 ml of 50 mmol/l ammonium formate pH 3.5 was added and the sample vortexed; 0.1 ml of the final extract was injected into a Shimadzu Prominence HPLC system, with detection of drugs achieved using an Applied Biosystems 3200 Q‐TRAP ® LC‐MS/MS system equipped with a Turbo V ion source [electron spray ionization (ESI), multiple reaction monitoring (MRM) mode]. The method has been validated according to international guidelines and was found to be selective for all tested compounds. Calibration was satisfactory for all drugs, except olanzapine, from subtherapeutic to toxic concentrations. The lower limits of quantifications (LLOQs) corresponded to the lowest concentrations used for the calibration curves. With the exception of the lowest concentrations of bromperidol, buspirone and perphenazine, accuracy data were within the acceptance interval of ± 15% ( ± 20% at LLOQ) of the nominal values for all drugs. The method has been proven to be useful for the routine analysis of APs in postmortem blood samples. Copyright © 2010 John Wiley & Sons, Ltd.