The activity changes in PAL, PPO and POD in FBS and blanched BSS are shown in Fig. 1. PPO activity has to be inhibited before drying because it is related with the browning reaction of fruits and vegetables during processing and storage (Vamosvigyazo, 1981). The PPO activity of FBS decreased gradually with blanching time increase, and it decreased by 77.98% after 9 min. Moreover, PPO became completely inactive at 12-min blanching treatments. These results indicated that PPO inactivation was significantly affected (P < 0.05) by blanching time.