The relationship between changes of activities of polyphenol oxidase(PPO) and superoxide dismutase(SOD) in peanut mildew process

The aim was to explore the relationship between changes of activities of polyphenol oxidase(PPO) and superoxide dismutase(SOD) in peanut mildew process,provide the theory basis for food quality test and stored safely.PPO activity was determined by adjacent catechol colour-display method,and SOD by adjacent pyrogallol selfoxidation method.The result shows that the activities of PPO and SOD were varied with peanuts mildew degree,presenting specific regularity.The PPO activity was the highest,and the SOD activity was the lowest in safety edible stage of peanuts.The change rate of PPO was negative 38.42 percent,and SOD more than 500 percent.This datum can be used as the basis for judging whether mildew peanuts.