Figure 2

Typical normal phase LC-MS/MS chromatograms analyzing a mixture of 1 ng SQOOH isomer standards (A), SQ samples oxidized by singlet oxygen oxidation in the presence of 10 mM EP for 8 hours (B), and SQ samples oxidized by free radical oxidation via heating at 50 °C for 8 hours (C). Numbers above the peaks represent retention times (min).