无处不有的、维持生命所必需的氧在人的代谢中,将营养物转化为能量,使内源物质氧化,并将异生物解毒。此过程中一般要将稳定的原子氧(O_2)转化为稳定的还原状态,例如在 CO_2及 H_2O 中。此时每个氧分子要加上4个电子。然而,某些情况下氧的还原可能不完全,产生一系列的不稳定性氧产物,包括氧来源的游离基(ODFR)、O_2~-(超氧化物)及OH~*(羟游离基)。 Everywhere, oxygen, which is essential for life, converts nutrients into energy, oxidizes endogenous substances and detoxifies them in human metabolism. In this process, stable atomic oxygen (O 2) is generally converted to a stable reduction state, for example, CO 2 and H 2 O. At this point to add four electrons per oxygen molecule. However, the reduction of oxygen may not be complete in some cases, resulting in a series of unstable oxygen products including oxygen-derived free radicals (ODFRs), O_2 ~ - (superoxide) and OH ~ * (hydroxyl radicals) .