Mirtazapine (MTZ) is an antidepressant drug, which belongs to the chemical class of piperazinoazepines. A liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed for the quantification of MTZ in plasma at the concentrations associated with therapy. Diazepam (DZP) was used as internal standard, added to 200 μL of plasma sample prior to a liquid-liquid extraction using hexane. Chromatographic separation was achieved on an Agilent ® Eclipse XDB C-18 column (100 × 2.1 mm, 3.5 μm) in isocratic mode at 40˚C. Mobile phase was 10 mM ammonium acetate/acetonitrile/formic acid (60/40/0.1, v/v/v) at a constant flow rate of 0.5 mL·min -1 . The injection volume was 10 L and the total run time was 3.2 min. The method shows selectivity and linearity. The detection and quantitation limits were established at 0.17 and 0.50 ng·mL -1 , respectively. The extraction recoveries for MTZ and DZP were found to be between 84.9 and 93.9%. The intra-day and inter-day precision and accuracy fulfill at the international acceptance criteria. The method shows to be stable for the studied parameters. Therefore, a rapid, specific, and sensitive LC-MS/MS method for quantification of MTZ in human plasma was developed and can be used in therapeutic drug monitoring of this drug.
Dezoito ratos wistar foram utilizados para investigar os efeitos de selenito de sódio (Na2SeO4) e de selênio, proveniente de leveduras (SeL) sobre os danos induzidos por aflatoxinas. Os animais foram distribuídos em seis grupos de tratamento com três repetições cada: grupo 1 = controle; grupo 2 = 480 mg kg-1 de aflatoxinas (AF); grupo 3 = 0,5 mg de Na2SeO4 por kg de dieta; grupo 4 = 0,5 mg de SeL por kg de dieta; grupo 5 = AF + 0,5 mg de Na2SeO4 por kg de dieta e grupo 6 = AF + 0,5 mg de SeL por kg de dieta. Aos 28 dias de ensaio os animais foram sacrificados para exame histopatológico. Os animais do grupo AF evidenciaram poucos sinais de hepatotoxicidade. Nos grupos AF + Na2SeO4 e AF + SeL, os animais apresentaram fígados muito bem preservados. Os grupos que receberam Na2SeO4 e SeL revelaram algumas alterações. Conclui-se que o selenito de sódio e SeL evidenciaram potencial para diminuir os danos provocados por aflatoxinas.
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