title: Simultaneous gas chromatographic determination of concentration and isotopic enrichment of fatty acids in human plasma using flame ionization and mass spectrometric detection.
abstract: Free fatty acids (FFAs) are important not only because they provide substrate for oxidation but also because they have the potential to regulate several metabolic and hormonal processes. Using stable isotope tracers, these processes can be studied. Here we present a gas chromatographic method to measure FFA concentrations and enrichments after extraction from plasma and subsequent derivatization in one analytical run, using both flame ionization and mass-selective detection. For concentration determinations intra-assay variation ranged from 1.5 to 4.9%, inter-assay variation ranged from 3 to 11%. Intra- and inter-assay variations of the enrichment determination of palmitic acid were 1.4 and 0.9%, respectively.
authors.affiliation: Department of Clinical Chemistry, University of Amsterdam, The Netherlands. a.f.ruiter@amc.uva.nl
authors.forename: A F
authors.initials: AF
authors.lastname: Ruiter
authors.forename: M T
authors.initials: MT
authors.lastname: Ackermans
authors.forename: E
authors.initials: E
authors.lastname: Endert
mesh_terms: D002849:Chromatography, Gas / Q000379:methods*; D005227:Fatty Acids / Q000097:blood*; D005410:Flame Ionization; D006801:Humans; D007554:Isotopes; D013058:Mass Spectrometry / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D005227:Fatty Acids; D007554:Isotopes