For 1 min,
PPO activity was greater (64.28%) compared to POD (16%). Steam
blanching for 5 min inactivated POD completely, while PPO activity
remained at 1.71%. PPO showed a rapid decrease from 1 min to
3 min and slowly from 3 min to 7 min, where complete inactiva-
tion was observed. According to Toma´ s-Barbera´n and Espı´ n
(2001), PPO is the main enzyme responsible for the browning reac-
tion in fruits and vegetables, although a possible synergy of these
two enzymes is not excluded.