title: Simultaneous determination of morinidazole, its N-oxide, sulfate, and diastereoisomeric N(+)-glucuronides in human plasma by liquid chromatography-tandem mass spectrometry.
abstract: Morinidazole is a new third-generation 5-nitroimidazole antimicrobial drug. To investigate the pharmacokinetic profiles of morinidazole and its major metabolites in humans, a liquid chromatography-tandem mass spectrometry method was developed and validated for simultaneous determination of morinidazole, its N-oxide metabolite (M4-1), a sulfate conjugate (M7), and two diastereoisomeric N(+)-glucuronides (M8-1 and M8-2) in human plasma. A simple acetonitrile-induced protein precipitation was employed to extract five analytes and internal standard metronidazole from 50μL human plasma. To avoid the interference from the in-source dissociation of the sulfate and achieve the baseline-separation of diastereoisomeric N(+)-glucuronides, all the analytes were separated from each other with the mobile phase consisting of 10mM ammonium formate and acetonitrile using gradient elution on a Hydro-RP C(18) column (50mm×2mm, 4μm) with a total run time of 5min. The API 4000 triple quadrupole mass spectrometer was operated under the multiple reaction-monitoring mode using the electrospray ionization technique. The developed method was linear in the concentration ranges of 10.0-12,000ng/mL for morinidazole, 1.00-200ng/mL for M4-1, 2.50-500ng/mL for M7, 3.00-600ng/mL for M8-1, and 10.0-3000ng/mL for M8-2. The intra- and inter-day precisions for each analyte met the accepted value. Results of the stability of morinidazole and its metabolites in human plasma were also presented. The method was successfully applied to the clinical pharmacokinetic studies of morinidazole injection in healthy subjects, patients with moderate hepatic insufficiency, and patients with severe renal insufficiency, respectively.
authors.affiliation: Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 501 Haike Road, Shanghai 201203, PR China.
authors.forename: Ruina
authors.initials: R
authors.lastname: Gao
authors.forename: Dafang
authors.initials: D
authors.lastname: Zhong
authors.forename: Ke
authors.initials: K
authors.lastname: Liu
authors.forename: Yu
authors.initials: Y
authors.lastname: Xia
authors.forename: Rongwei
authors.initials: R
authors.lastname: Shi
authors.forename: Hua
authors.initials: H
authors.lastname: Li
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Chen
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004355:Drug Stability; D020719:Glucuronides / Q000097:blood / Q000737:chemistry / Q000493:pharmacokinetics; D006801:Humans; D016018:Least-Squares Analysis; D009593:Nitroimidazoles / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics*; D010087:Oxides / Q000097:blood / Q000737:chemistry / Q000493:pharmacokinetics; D051437:Renal Insufficiency / Q000378:metabolism; D015203:Reproducibility of Results; D013431:Sulfates / Q000097:blood / Q000737:chemistry / Q000493:pharmacokinetics; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D020719:Glucuronides; D009593:Nitroimidazoles; D010087:Oxides; D013431:Sulfates; C547405:morinidazole