This study investigated the hypothesis that nitration of γ-tocopherol may be an important mechanism for the detoxification of reactive nitrogen oxide species in vivo. Using liquid chromatography—tandem MS we have shown that γ-tocopherol can be nitrated in vivo to form 5-nitro-γ-tocopherol and that concentrations of this compound are elevated in the plasma of subjects with coronary heart disease. In addition, we demonstrate in carotid-artery atherosclerotic plaque that nitration of γ-tocopherol is also evident at levels similar to that seen in the plasma of subjects with coronary heart disease.

Abbreviations used: RNOS, reactive nitrogen oxide species; LC-UV, liquid chromatography with UV detection; LC-MS/MS, liquid chromatography—tandem MS.

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