Linked Life Data

17702674

Source:http://linkedlifedata.com/resource/pubmed/id/17702674

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2007-9-28
pubmed:abstractText
Omeprazole is a proton pump inhibitor drug in widespread use for the reduction of gastric acid production. It is also proposed as a test substance for the phenotyping of cytochrome CYP3A4 and CYP2C19 enzyme activities. For this purpose, it is necessary to quantify, additionally to omeprazole, the two main metabolites 5-hydroxyomeprazole and omeprazole-sulfon in human plasma. Since omeprazole is a racemic mixture of two enantiomers and its enzymatic decomposition depends in part on its chiral configuration, full information about its metabolic breakdown can only be gained by enantioselective quantification of the drug and its metabolites. We introduce a new LC-MS/MS method that is capable to simultaneously quantify omeprazole and its two main metabolites enantioselectively in human serum. The method features solid-phase extraction, normal phase chiral HPLC separation and atmospheric pressure photoionization tandem mass spectrometry. As internal standards serve stable isotope labeled omeprazole and 5-hydroxyomeprazole. The calibration functions are linear in the range of 5-750 ng/ml for the omeprazole enantiomers and omeprazole-sulfon, and 2.5-375 ng/ml for the 5-hydroxyomeprazole enantiomers, respectively. Intra- and inter-day relative standard deviations are <7% for omeprazole and 5-hydroxyomeprazole enantiomers, and <9% for omeprazole-sulfon, respectively.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
1570-0232
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
857
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
301-7
pubmed:dateRevised
2007-12-10
pubmed:meshHeading
pubmed:year
2007
pubmed:articleTitle
Enantioselective quantification of omeprazole and its main metabolites in human serum by chiral HPLC-atmospheric pressure photoionization tandem mass spectrometry.
pubmed:affiliation
Institute of Clinical Pharmacology, Otto-von-Guericke University, Leipziger Strasse 44, 39120 Magdeburg, Germany. jens.martens-lobenhoffer@med.ovgu.de
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't