金针菇酶促褐变的区域分布及调控

金针菇的多酚氧化酶(PPO)、过氧化物酶(POD)和过氧化氢酶(CAT)活性在全株中呈现区域化分布。菌盖的酶活性最低,菌柄上部酶活性稍高,菌柄中部较高,菌柄下部活性最高。用硫脲、亚硫酸盐、CaCl₂、低CO₂、低温等方法处理金针菇,对以上三种酶的活性均有抑制作用。高0₂、H₂O₂和温度的提高均促进三种酶活性。高N₂(减压后充N₂)不能抑制三种酶活性。

Compartmentation distribution and regulation of enzymicbrowning in Flammulina velutipes

The compartmentation distribution of polyphenol oxidase (PPO), peroxidase(POD) and catalase (CAT) activities in Flammulina velutipes appeared. The activitylevels were the lowest at the cap, high at the top of stipe, higher at the middleof stipe, and the highest at the bottom of stipe. Flammulina velutipes were treatedwith thiourea, sodium sulfite, Ca2 , and at high CO2, low O2 and low temperature,the activities of PPO, POD and CAT were inhibited. High 02, H202 and high temperatureenhanced the activities of PPO, POD and CAT. High N2 could not inhibit the activitiesof them.