activity of polyphenol oxidase的用法和样例：
- Chitosan also inhibit the activity of polyphenol oxidase(PPO) and peroxidase(POD),which indicate the significant effect of chitosan on flat peach fresh-keeping.
- When the activity of polyphenol oxidase reaches the maximum, watermelon arrives at peak of breath.The active dynamic changes of polyphenol oxidase can indicate the arrival of the high breath peak.
- Coated urea application increased the activities of polyphenol oxidase, phosphatase, and urease, which were significantly correlated with soil nutrient factors.
- Early stage of infection by alginic acid decomposing bacteria, the contents of polyphenol compound increased quickly,but the activities of polyphenol oxidase were stabilized.
- Effects of Different Pretreatments on the Total Phenol Content and Activity of Polyphenol Oxidase in Chinese Chestnut Leaf