title: A technique for the in vivo study of multiple stable isotope-labeled essential fatty acids.
abstract: A novel tracer technique is presented for the simultaneous and independent measurement of multiple stable isotopically labeled essential fatty acids. Gas chromatography/negative chemical ionization mass spectrometry was employed for high sensitivity detection of the following isotopes: deuterium-labeled-linolenate, carbon-13-U-labeled-eicosapentaenoate, carbon-13-U-labeled-linoleate, and deuterium-labeled-dihomo-gamma-linolenate. These isotope-labeled fatty acids in vehicle oil were given to rats either singly or together as a single oral dose. Rat blood was collected after dosing and the isotopomers of the precursors and their main metabolites, including those containing both(13) C and (2)H, were detected simultaneously with good resolution and without interference from other isotopes due to differences in mass and chromatographic retention.
mesh_terms: D000284:Administration, Oral; D000818:Animals; D005227:Fatty Acids / Q000008:administration & dosage / Q000097:blood* / Q000737:chemistry* / Q000493:pharmacokinetics; D015525:Fatty Acids, Omega-3 / Q000008:administration & dosage / Q000097:blood / Q000737:chemistry / Q000493:pharmacokinetics; D043371:Fatty Acids, Omega-6; D005231:Fatty Acids, Unsaturated / Q000008:administration & dosage / Q000097:blood / Q000737:chemistry / Q000493:pharmacokinetics; D008401:Gas Chromatography-Mass Spectrometry; D007553:Isotope Labeling / Q000379:methods*; D007554:Isotopes; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D012680:Sensitivity and Specificity
chemical_list: D005227:Fatty Acids; D015525:Fatty Acids, Omega-3; D043371:Fatty Acids, Omega-6; D005231:Fatty Acids, Unsaturated; D007554:Isotopes