title: Identification of the metabolites of ecabet bismuth in rat bile by liquid chromatography-electrospray ionization-tandem mass spectrometry.
abstract: In the present study, a liquid chromatography-electrospray ionization-tandem mass spectrometry (LC-ESI- MS/MS) method was developed for the screening and the structural elucidation of the metabolites of ecabet bismuth in rat bile. Solid-phase extraction cartridges were used for sample pre-treatment and a gradient liquid chromatographic system composed of 10 mM ammonium acetate buffer and methanol was used for chromatographic separation on a Phenomenex Kromasil C(18) column. The triple quadrupole mass spectrometer was employed to thoroughly detect and acquire the detailed MS/MS spectra of ecabet and its metabolites. By comparing the chromatographic retention behaviors, as well as the changes in molecular weight and full-scan MS/MS spectra of the potential metabolites with those of the parent compound, two main metabolites were identified as glucuronide conjugate of carbonylated ecabet (7-oxo-ecabet) and glucuronide conjugate of ecabet. Both two metabolites have not been reported in the literatures. The metabolic pathways of ecabet in rat were also proposed in this paper.
authors: Department of Pharmaceutical Analysis, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing, China.
authors: Yue
authors: Y
authors: Wu
authors: Jing
authors: J
authors: Yang
authors: Li
authors: L
authors: Ding
authors: Guili
authors: G
authors: Xu
authors: Wenjuan
authors: W
authors: Qian
authors: Changhong
authors: C
authors: Yun
authors: Jianchang
authors: J
authors: He
mesh_terms: D045784:Abietanes / Q000032:analysis* / Q000378:metabolism*; D000818:Animals; D000897:Anti-Ulcer Agents / Q000032:analysis* / Q000378:metabolism*; D001646:Bile / Q000737:chemistry*; D002853:Chromatography, Liquid / Q000379:methods*; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D053719:Tandem Mass Spectrometry / Q000379:methods
chemical_list: D045784:Abietanes; D000897:Anti-Ulcer Agents; C061681:ecabet