Quantification of F-2-isoprostanes as a biomarker of oxidative stress

Oxidant stress has been implicated in a wide variety of disease processes. One method to quantify oxidative injury is to measure lipid peroxidation. Quantification of a group of prostaglandin F-2 alpha-like compounds derived from the nonezymatic oxidation of arachidonic acid, termed the F-2-isoprostanes (F-2-IsoPs), provides an accurate assessment of oxidative stress both in vitro and in vivo. In fact, in a recent independent study sponsored by the National Institutes of Health (NIH), F-2-IsoPs were shown to be the most reliable index of in vivo oxidant stress when compared against other well known biomarkers. This protocol details our laboratory's method to quantify F-2-IsoPs in biological fluids and tissues using gas chromatography-mass spectrometry (GC-MS). This procedure can be completed for 12-15 samples in 6-8 h.