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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.

Research paper by Dora D Il'yasova, Jason D JD Morrow, Anastasia A Ivanova, Lynne E LE Wagenknecht

Indexed on: 03 Nov '04Published on: 03 Nov '04Published in: Annals of Epidemiology



Abstract

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.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.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.We conclude that the current ELISA method is not a valid substitute for the GS/MS assay.

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