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A liquid chromatography-tandem mass spectrometry method is described for the blood determination of selective serotonin reuptake inhibitors (fluoxetine, paroxetine, sertraline, fluvoxamine, and citalopram), serotonin noradrenaline reuptake inhibitors (milnacipram and venlafaxine), a noradrenergic and specific serotoninergic antidepressant (mirtazapine) and five of their active metabolites (norfluoxetine, desmethylcitalopram, didesmethylcitalopram, desmethylvenlafaxine, and desmethylmirtazapine). After a liquid-liquid extraction from blood, the compounds and the internal standard (methylrisperidone) were eluted on a XTerra RP18 column with a gradient of acetonitrile/ammonium formate buffer 4 mmol/L pH 3.2. They were then detected by electrospray ionization mass spectrometry with multiple reaction monitoring mode. The calibration curves were linear over the range 5-500 ng/mL (20-2000 ng/mL for venlafaxine and desmethylvenlafaxine). The limit of quantification was set at 5 ng/mL for each compound (except for venlafaxine and desmethylvenlafaxine: 20 ng/mL). The bias were lower than 12%. Intraday and interday precisions, expressed as variation coefficient, were lower than 11%. The extraction recoveries were between 70 and 90% except for desmethylmirtazapine, desmethylvenlafaxine, milnacipram, and didesmethylcitalopram. This specific and sensitive method allows management of intoxication and is suitable for the routine determination of antidepressants in forensic investigations.

journal of analytical toxicology.

Quantification of Eight New Antidepressants and Five of their Active Metabolites in Whole Blood by High-Performance Liquid Chromatography-Tandem Mass Spectrometry