A UHPLC-MS/MS method coupled with liquid-liquid extraction for the quantitation of phenacetin, omeprazole, metoprolol, midazolam and their metabolites in rat plasma and its application to the study of four CYP450 activities

In this study, we established a UHPLC-MS/MS method for simultaneous quantitation of four CYP450 probe drugs (phenacetin, omeprazole, metoprolol and midazolam) and their metabolites (acetaminophen, 5'-hydroxy omeprazole, α-hydroxy metoprolol and 1'-hydroxy midazolam) in rat plasma. Sample preparation by plasma protein precipitation was combined with a liquid-liquid extraction method. The separation was carried out on a ZORBAX Eclipse Plus C18 Rapid Resolution High Definition column with a gradient elution, using water containing 0.1% formic acid (A) and acetonitrile (B) in a run time of only 3.0 min. Detection was conducted with a 6420 series triple-quadrupole tandem mass spectrometer, using ESI in positive ion mode with multiple reaction monitoring (MRM). The calibration curves were linear over the concentration range 10-5000 ng/mL for phenacetin, omeprazole, metoprolol and midazolam, and 1-500 ng/mL for their metabolites. Intra- and inter-day precisions were within 15%, and the accuracies were in the range of 87-112%. The method was successfully applied to the pharmacokinetic study of probe drugs/metabolites and DDIs with 3-n-butylphthalide (NBP) after administration of a single oral dose of phenacetin, omeprazole, metoprolol and midazolam in rats.
Source: Journal of Pharmaceutical and Biomedical Analysis - Category: Drugs & Pharmacology Source Type: research

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Publication date: Available online 18 January 2020Source: The American Journal of SurgeryAuthor(s): Asishana A. Osho, Muath M. Bishawi, Elbert E. Heng, Ejiro Orubu, Aaron Amardey-Wellington, Mauricio A. Villavicencio, Masaki FunamotoAbstractBackgroundFailure to Rescue (FTR) is a valuable surgical quality improvement metric. The aim of this study is to assess the relationship between center volume and FTR following lung transplantation.MethodsUsing the database of the United Network for Organ Sharing (UNOS) all adult, primary, isolated lung recipients in the United States between May 2005 and March 2016 were identified. FTR...
Source: The American Journal of Surgery - Category: Surgery Source Type: research
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Source: European Journal of Surgical Oncology (EJSO) - Category: Surgery Source Type: research
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Source: European Journal of Surgical Oncology (EJSO) - Category: Surgery Source Type: research
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Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Physician Scientists Source Type: forums
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Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Medical Students - DO Source Type: forums
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Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Help me Decide: X vs Y Dental School Source Type: forums
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Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Psychiatry Source Type: forums
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Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Help Me Decide: X vs Y Medical School Source Type: forums
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