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Table 1 Major Endogenous Oxidants

From: Oxidative Stress and Antioxidant Defense

Oxidant

Formula

Reaction Equation

Superoxide anion

O2-.

NADPH + 2O2 ↔ NADP+ + 2O2-. + H+

2O2-. + H+ → O2 + H2O2

Hydrogen peroxide

H2O2

Hypoxanthine + H2O + O2 xanthine + H2O2

Xanthine + H2O + O2 uric acid + H2O2

Hydroxyl radical

OH

Fe2+ + H2O2 → Fe3+ + OH- + OH

Hypochlorous acid

HOCl

H2O2 + Cl- → HOCl + H2O

Peroxyl radicals

ROO

R + O2 → ROO

Hydroperoxyl radical

HOO·

O2- + H2O HOO· + OH-