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  • Title: Determination of antipsychotic drugs in nails and hair by liquid chromatography tandem mass spectrometry and evaluation of their incorporation into keratinized matrices.
    Author: Cobo-Golpe M, de-Castro-Ríos A, Cruz A, Páramo M, López-Rivadulla M, Lendoiro E.
    Journal: J Pharm Biomed Anal; 2020 Sep 10; 189():113443. PubMed ID: 32619731.
    Abstract:
    Nail samples are an alternative to hair for long-term monitoring of drug use, although there are a limited number of studies about its applicability. This study presents the development and validation of a LC-MS/MS method for the determination of five antipsychotic drugs (clozapine, haloperidol, levomepromazine, olanzapine and quetiapine) in nail and in hair samples. Samples were washed with dichloromethane, pulverized with a ball mill, and incubated in water:acetonitrile (50:50 v/v) with horizontal agitation for 90 min. Then, samples were purified by solid phase extraction with OASIS MCX cartridges and analysed by LC-MS/MS. The analytical method was fully validated in nails and in hair, including: limits of detection (2.5 pg/mg and 2.5-10 pg/mg, respectively), limits of quantification (LOQ) (10 pg/mg and 10-20 pg/mg, respectively), linearity (LOQ to 10,000 pg/mg), selectivity (no endogenous or exogenous interferences), accuracy (97.4-106.9% and 97.3-108.2%, respectively), imprecision (<7.9% and <8.6%, respectively), extraction efficiency (62.3%-109.8% and 45.1%-83.6%, respectively), matrix effect (-35.6% to 654.4% and -71.0% to -10.8%, respectively) and autosampler stability after 72 h (%loss <12.4%). Moreover, paired fingernail, toenail and hair samples from 13 patients under chronic treatment were analysed, and concentrations in the different matrices were compared. Concentrations in real samples ranged from 11.3-8306 pg/mg in fingernails, from 12.7-1755.4 pg/mg in toenails and from 17.6-24045.4 pg/mg in hair. Hair concentrations were generally higher than nail concentrations; however, a variable pattern was found in fingernails and toenails depending on the case. In addition, concentrations in paired hair and nail samples from a patient under chronic treatment with quetiapine at different doses were studied for 1-year.
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