Extraction and partial purification of PPO from banana peel
Extraction of PPO was carried out in 50 mM phosphate buffer (pH7).Precipitateds fromed with (NH4)2SO4 between 0-80% were tested to find the proper saturation point.The precipitate obtained from 70% (NH4)2SO4 saturation contained most of the activity and this saturation was used for all extraction processes. An enzyme was purified 2.15-fold with 6.7% yield, by 70% (NH4)2SO4 fractionation (data not shown).Purification of 2 to 8-fold has been reported for PPOs from different sources using (NH4)2SO4 fractionation. A comparison of purification fold for PPO enzyme extracted from various sources has been showed in Table 2.