Oxidation is a metabolic process that provides energy for essential cell activities. In normal physiological condition, oxygen derived free radicals are produced in this process, such as O2-·,·OH and so on, which were commonly known as reactive oxygen species (ROS). In our living systems, varieties of antioxidants play an important role in combating ROS, such as the effect of oxidoreductase and non-enzymatic compounds. However, in pathology state, the defense systems would become over-whelmed during a metab...