Activity Variations of Polyphenol Oxidase and Peroxidase during Zuoqing Process of Oolong Tea

Oolong tea was manufactured by raw material with one bud and three or four leaves of Maoxie cultivar, using new processing technology. The activities of Polyphenol oxidase (PPO) and Peroxidase(POD) in Zuoqing process were investigated. During the Zuoqing process, the activities of PPO and POD in the entire leaf varied as low→high→low and high→low→high respectively; the activity of PPO in the leaf edge varied as high→low→high, but of POD as low→high→low; the activities of PPO and POD in leaf center increased and decreased respectively.