title: Determination of 8-epi PGF(2alpha) concentrations as a biomarker of oxidative stress using triple-stage liquid chromatography/tandem mass spectrometry.
abstract: F2-isoprostanes are a family of prostaglandin F2-like compounds that are formed by free-radical-catalyzed peroxidation of arachidonic acid. Several F2-isoprostanes, but in particular 8-epi PGF(2alpha), are widely used as oxidative stress biomarkers. An analytical method based on liquid chromatography with negative electrospray ionization (ESI) coupled to tandem mass spectrometric detection (LC/MS/MS) was developed for the determination of 8-epi PGF(2alpha) concentrations in human plasma, whole blood, erythrocytes and urine. 8-epi PGF(2alpha)-d4, a stable isotope derivative of 8-epi PGF(2alpha), was used as an internal standard (IS). A 50 microL sample was focused on-column and separated on two 3 microm particle size SUPELCOSIL ABZ+Plus HPLC columns (15 cm x 4.6 mm and 7.5 cm x 4.6 mm) connected in series. An Applied Biosystems 4000 Q TRAP LC/MS/MS system with ESI was operated in multiple reaction monitoring (MRM) mode with the precursor-to-product ion transitions m/z 353.4 --> 193.1 (8-epi PGF(2alpha)), 357.4 --> 197.1 (8-epi PGF(2alpha)-d4), used for quantification. The assay was fully validated and found to have adequate accuracy, precision, linearity, sensitivity and selectivity. The mass limit of detection (mLOD) was 1 pg of analyte eluting from the column. The assay has been successfully applied to the analysis of human plasma, whole blood, erythrocytes and urine samples.
authors: Institute of Basic Medical Sciences, University of Oslo, P.O. Box 1046 Blindern, N-0316 Oslo, Norway. n.e.bastani@medisin.uio.no
authors: Nasser E
authors: NE
authors: Bastani
authors: Thomas E
authors: TE
authors: Gundersen
authors: Rune
authors: R
authors: Blomhoff
mesh_terms: D015415:Biomarkers / Q000032:analysis / Q000097:blood / Q000652:urine; D002853:Chromatography, Liquid / Q000379:methods*; D015237:Dinoprost / Q000031:analogs & derivatives* / Q000032:analysis / Q000097:blood / Q000652:urine; D006801:Humans; D018384:Oxidative Stress; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D014662:Vasoconstrictor Agents / Q000032:analysis* / Q000097:blood / Q000652:urine
chemical_list: D015415:Biomarkers; D014662:Vasoconstrictor Agents; C075750:8-epi-prostaglandin F2alpha; D015237:Dinoprost