Role of Catalase in Oxidative Stress- and Age-Associated Degenerative Diseases

Table 1

Examples of the various free radicals and other oxidants in the cell [2].

Reactive oxidants	Examples
Reactive oxygen species (ROS)	Superoxide (O2^⋅–), hydroxyl radical (OH^⋅), hydrogen peroxide (H2O2), alkoxyl radical (RO^⋅), lipid alkoxyl (LO^⋅), Peroxyl radical (RO2^⋅), ozone (O3), lipid peroxide (LOOH), singlet oxygen (^1O2), Hydroperoxyl radical (HO2^⋅)
Reactive chlorine species (RCS)	Hypochlorite ion (OCl^−), nitryl chloride (NO2Cl)
Reactive nitrogen species (RNS)	Nitric oxide (NO^⋅), nitrous acid (HNO2), Nitrosonium cation (NO^+), nitrosyl anion (NO^-), peroxynitrite (ONOO^-), nitrogen dioxide (NO2), alkyl peroxynitrite (ROONO)
Reactive sulfur species (RSS)	Thiyl radical (R-S^⋅), perthiyl radical (RSS^⋅)