The activity of polyphenoloxidase, which affected the colour of the juice, was also detected by the absorbency value A410.The value changed little, and the colour of the juice remained unchanged.

• 试验时又对影响果汁色泽的多酚氧化酶活性进行了A410测定，结果表明多酚氧化酶A410值变化不大，果汁维持原色。