High Quality Content by WIKIPEDIA articles! Peroxynitrite (sometimes called peroxonitrite) is the anion with the formula ONOO?. It is an unstable structural isomer of nitrate, NO3?, which has the same formula but a different structure. Although peroxynitrous acid is highly reactive, its conjugate base peroxynitrite is stable in basic solution. It is prepared by the reaction of hydrogen peroxide with nitrite: H2O2 + NO2? ? ONOO? + H2O Peroxynitrite is an oxidant and nitrating agent. Because of its oxidizing properties, peroxynitrite can damage a wide array of molecules in cells, including DNA and proteins. Formation of peroxynitrite in vivo has been ascribed to the reaction of the free radical superoxide with the free radical nitric oxide: ·O2? + ·NO ? ONO2?

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