Liquid chromatography-electrospray ionization ion trap mass spectrometry for analysis of in vivo and in vitro metabolites of scopolamine in rats.

Liquid chromatography-electrospray ionization ion trap mass spectrometry for analysis of in vivo and in vitro metabolites of scopolamine in rats. Research Abstract Details 

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Liquid chromatography-electrospray ionization ion trap mass spectrometry for analysis of in vivo and in vitro metabolites of scopolamine in rats. Abstract Text:

Huaixia Chen,Yong Chen,Peng Du,Fengmei Han,

In vivo and in vitro metabolism of scopolamine is investigated using a highly specific and sensitive liquid chromatography-mass spectrometry (LC-MS(n)) method. Feces, urine, and plasma samples are collected individually after ingestion of 55 mg/kg scopolamine by healthy rats. Rat feces and urine samples are cleaned up by a liquid-liquid extraction and a solid-phase extraction procedure (C18 cartridges), respectively. Methanol is added to rat plasma samples to precipitate plasma proteins. Scopolamine is incubated with homogenized liver and intestinal flora of rats in vitro, respectively. The metabolites in the incubating solution are extracted with ethyl acetate. Then these pretreated samples are injected into a reversed-phase C18 column with mobile phase of methanol-ammonium acetate (2mM, adjusted to pH 3.5 with formic acid) (70:30, v/v) and detected by an on-line MS(n) system. Identification and structural elucidation of the metabolites are performed by comparing their changes in molecular masses (DeltaM), retention-times and full scan MS(n) spectra with those of the parent drug. The results reveal that at least 8 metabolites (norscopine, scopine, tropic acid, aponorscopolamine, aposcopolamine, norscopolamine, hydroxyscopolamine, and hydroxyscopolamine N-oxide) and the parent drug exist in feces after administering 55 mg/kg scopolamine to healthy rats. Three new metabolites (tetrahydroxyscopolamine, trihydroxy-methoxyscopolamine, and dihydroxy-dimethoxyscopolamine) are identified in rat urine. Seven metabolites (norscopine, scopine, tropic acid, aponorscopolamine, aposcopolamine, norscopolamine, and hydroxyscopolamine) and the parent drug are detected in rat plasma. Only 1 hydrolyzed metabolite (scopine) is found in the rat intestinal flora incubation mixture, and 2 metabolites (aposcopolamine and norscopolamine) are identified in the homogenized liver incubation mixture.

Liquid chromatography-electrospray ionization ion trap mass spectrometry for analysis of in vivo and in vitro metabolites of scopolamine in rats. Publishing Authors By Initials

H Chen,Y Chen,P Du,F Han,

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Liquid chromatography-electrospray ionization ion trap mass spectrometry for analysis of in vivo and in vitro metabolites of scopolamine in rats. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of chromatographic science

VOLUME: 46

Page Numbers: 74-80

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ISSN: 0021-9665

DAY: 25

MONTH: Jan

YEAR: 2008

Liquid chromatography-electrospray ionization ion trap mass spectrometry for analysis of in vivo and in vitro metabolites of scopolamine in rats. Information

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LANGUAGE: eng

NlmUniqueID: 173225

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Grant and Affiliation Information for Liquid chromatography-electrospray ionization ion trap mass spectrometry for analysis of in vivo and in vitro metabolites of scopolamine in rats.

AFFILIATION: Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules & College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, China.

Country: United States

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MEDLINETA: J Chromatogr Sci

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