part of part of molecular_function gene product or complex activity antioxidant activity Inhibition of the reactions brought about by dioxygen (O2) or peroxides. Usually the antioxidant is effective because it can itself be more easily oxidized than the substance protected. The term is often applied to components that can trap free radicals, thereby breaking the chain reaction that normally leads to extensive biological damage. molecular_function GO:0016209 cellular oxidant detoxification