title: Urinary 2-ethyl-3-oxohexanoic acid as major metabolite of orally administered 2-ethylhexanoic acid in human.
abstract: Human metabolism of 2-ethylhexanoic acid (2-EHA), which is a known metabolite of important phthalates, was investigated using 2-EHA-contaminated food. The results of our studies reveal that the major catabolic pathway of 2-EHA in human is beta-oxidation. The dominant final urinary metabolite was identified and quantified as 3-oxo-2-ethylhexanoic acid (3-oxo-2-EHA), but only after immediate methylation of the extract from urine and prior to GC-MS analysis. Former studies without the precaution of immediate methylation had found 4-heptanone as the major metabolite, which is obviously an artifact arising from the decarboxylation of 3-oxo-2-EHA.
authors.affiliation: Lehrstuhl für Lebensmittelchemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
authors.forename: Dana
authors.initials: D
authors.lastname: Stingel
authors.forename: Peter
authors.initials: P
authors.lastname: Feldmeier
authors.forename: Elke
authors.initials: E
authors.lastname: Richling
authors.forename: Michael
authors.initials: M
authors.lastname: Kempf
authors.forename: Sandra
authors.initials: S
authors.lastname: Elss
authors.forename: Samira
authors.initials: S
authors.lastname: Labib
authors.forename: Peter
authors.initials: P
authors.lastname: Schreier
mesh_terms: D000328:Adult; D002208:Caproates / Q000008:administration & dosage* / Q000493:pharmacokinetics* / Q000652:urine*; D005260:Female; D005506:Food Contamination; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D007700:Kinetics; D008279:Magnetic Resonance Imaging; D008297:Male; D010084:Oxidation-Reduction
chemical_list: C439933:2-ethyl-3-oxohexanoic acid; D002208:Caproates; C040668:2-ethylhexanoic acid