Simultaneous quantification of olanzapine and its metabolite N-desmethylolanzapine in human plasma by liquid chromatography tandem mass spectrometry for therapeutic drug monitoring

• Published in: Biomedical chromatography 2015-05, Vol.29 (5), p.671-678
• Main Authors: Lou, Hong-gang, Ruan, Zou-rong, Jiang, Bo, Chen, Jin-liang
• Format: Article
• Language: English
• Subjects: Adult; Benzodiazepines - blood; Benzodiazepines - metabolism; Chromatography, High Pressure Liquid - methods; Drug Monitoring - methods; Female; Humans; LC-MS/MS; Male; Middle Aged; N-desmethylolanzapine; olanzapine; Pirenzepine - analogs & derivatives; Pirenzepine - blood; Tandem Mass Spectrometry - methods; therapeutic drug monitoring; Young Adult
• ISSN: 0269-3879; 1099-0801
• DOI: 10.1002/bmc.3329

ABSTRACT A simple, sensitive, and selective liquid chromatography tandem mass spectrometry (LC‐MS/MS) method was developed and validated for the simultaneous quantification of olanzapine (OLZ) and its metabolite N‐desmethylolanzapine (DMO) in human plasma for therapeutic drug monitoring. Sample preparation was performed by one‐step protein precipitation with methanol. The analytes were chromatographed on a reversed‐phase YMC‐ODS‐AQ C18 Column (2.0 × 100 mm,3 µm) by a gradient program at a flow rate of 0.30 mL/min. Quantification was performed on a triple quadrupole tandem mass spectrometer via electrospray ionization in positive ion mode. The method was validated for selectivity, linearity, accuracy, precision, matrix effect, recovery and stability. The calibration curve was linear over the concentration range 0.2–120 ng/mL for OLZ and 0.5–50 ng/mL for DMO. Intra‐ and interday precisions for OLZ and DMO were