Epidemiological marker for oxidant status: comparison of the ELISA and the gas chromatography/mass spectrometry assay for urine 2,3-dinor-5,6-dihydro-15-F2t-isoprostane.

Published

Journal Article

PURPOSE: A biomarker of oxidant status applicable to epidemiological research is essential to studying the relationship between free radicals and chronic disease risk. Gas chromatography with mass-spectrometry detection (GC/MS) is the gold standard for measurement of urinary F2-isoprostanes (F2-isoPs), a non-invasive marker of oxidant status. However, this method is laborious and costly, which prohibits its use in large epidemiological studies. METHODS: We compared GC/MS assay with an inexpensive quick enzyme-linked immunoassay (ELISA) in measurements of 2,3-dinor-5,6-dihydro-15-F2t-isoprostane (F2-isoPM), an abundant beta-oxidation metabolite of 8-iso-prostaglandin-F2alpha. We measured F2-isoPM in urine of 52 participants of the Insulin Resistance Atherosclerosis Study by both methods. RESULTS: The ELISA measurements showed approximately 30-fold greater mean and median (22.10, SD 12.92, and 18.49 ng/mg creatinine) than the GC/MS measurements (0.703, SD 0.468, and 0.597 ng/mg creatinine). We found low linear correlation (Pearson correlation coefficient 0.51; 95% CI, 0.28-0.70) and weak agreement in ranking subjects by tertiles (weighted Kappa statistic 0.34) between a GC/MS and ELISA. CONCLUSIONS: We conclude that the current ELISA method is not a valid substitute for the GS/MS assay.

Full Text

Duke Authors

Cited Authors

  • Il'yasova, D; Morrow, JD; Ivanova, A; Wagenknecht, LE

Published Date

  • November 2004

Published In

Volume / Issue

  • 14 / 10

Start / End Page

  • 793 - 797

PubMed ID

  • 15519902

Pubmed Central ID

  • 15519902

Electronic International Standard Serial Number (EISSN)

  • 1873-2585

International Standard Serial Number (ISSN)

  • 1047-2797

Digital Object Identifier (DOI)

  • 10.1016/j.annepidem.2004.03.003

Language

  • eng