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2 protocols using α hydroxymetoprolol

1

Quantitative Bioanalysis of Pharmaceutical Compounds

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Caffeine-d9, ciprofloxacin, efavirenz-d4, 8-hydroxyefavirenz, 8,14-dihydroxyefavirenz, fluconazole, losartan, losartan carboxylic acid (E3174), losartan-d4, α-hydroxyMetoprolol, Metoprolol-d7, omeprazole, 5-hydroxyomeprazole, omeprazole-d3, paroxetine, and rifampicin were purchased from Toronto Research Chemicals (Toronto, Canada). 1’-HydroxyMidazolam and Midazolam-d6 were purchased from Lipomed (Lipomed AG, Arlesheim, Switzerland). Metoprolol, paraxanthine, and β-glucuronidase were obtained from Sigma-Aldrich (Sigma-Aldrich Chemie GmbH, Buchs, Switzerland). Midazolam (Hoffmann-La Roche, Basel, Switzerland) and efavirenz (Merck, NJ, USA) were kindly provided by the producers.
Formic acid, high-performance liquid chromatography (HPLC)-grade methanol, and water were purchased from Merck (Merck, Darmstadt, Germany). Stock solutions, calibration spiking solutions, and quality controls were prepared in dimethyl sulfoxide. Calibration standards were prepared by enriching caffeine-free blank human serum using the corresponding spiking solutions. Internal standard solutions containing the deuterated compounds were prepared in methanol.
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2

Quantitative LC-MS/MS Bioanalysis

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Phenacetin (99.9%, T0778), acetaminophen (99.9%, T0065), tolbutamide (99.7%, T1054), metoprolol (99.8%, T0487), and chlorzoxazone (99.7%, T1650) were purchased from Target Molecule Corp. (Massachusetts, USA); omeprazole (> 99%, MB1692-S) from Dalian Meilun Biotech Co., Ltd. (Dalian, China); midazolam (5 mg/mL, H10980025) from Jiangsu Enhua Pharmaceutical Co., Ltd. (Xuzhou, China); 4 -hydroxytolbutamide (100%, H969850), 5 -hydroxyomepreole (95%, H948110), α -hydroxymetoprolol (100%, H948390), and 6 -hydroxychlorzoxazone (100%, H825120) from Toronto Research Chemicals (Toronto, Canada); 1hydroxymidazolam (95%, 10385-1) from Cayman Chemicals (Michigan, USA); and lamotrigine (100775-200401) from National Institutes for Food and Drug Control (Beijing, China). Glycyrrhetic acid (> 98%, B20412) was obtained from Yuanye Biotechnology Co., Ltd. (Shanghai, China) and used as internal standard (IS). HPLC-grade acetonitrile and methanol were purchased from Merck Company (Darmstadt, Germany); formic acid from CNW Technologies (Dusseldorf, Germany); phosphate buffer saline from Beijing Solarbio Science & Technology Co., Ltd. (Beijing, China); ReadiUse NADPH Regenerating Kit from Wuhan PrimeTox Bio-pharma Technology Co., Ltd. (Wuhan, China); and deionized water from a Millipore Milli-Q Plus system (Bedford, USA).
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