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. 2017 Jul 27;6:F1000 Faculty Rev-1243. [Version 1] doi: 10.12688/f1000research.10553.1

Table 2. Reactions that produce free radicals.

Superoxide production O 2 + e : O 2
Hydrogen peroxide production 2H + O 2 : H 2O 2
Haber-Weiss reaction O 2 + H 2O 2 : O 2 + 2OH
Fenton reaction Fe 2+ + H 2O 2 : OH + OH Fe 3+
Peroxynitrite production O 2 + NO : ONOO
Peroxynitrous acid production ONOO + H + : ONOOH
Breakdown of peroxynitrous acid ONOOH : OH + NO 2
NO 2 and CO 3 production ONOO + CO 2 : NO 2 + CO 3