Effect of ultrasound in combination with food additives on polyphenol oxidase activity

摘要

Polyphenol oxidase was treated with ascorbic acid, citric acid, sodium sulfite, potassium sorbate in combination with ultrasound. The effect of these treatments on the activity of PPO was studied. Results indicated that the separate treatment of ascorbic acid, citric acid, sodium sulfite could obviously inhibit PPO activity and could make a completely inhibition when the concentration was respectively 1 mM, 1 mM and 10 mM. Ascorbic acid or citric acid in combination with ultrasound had a certain synergistic effect for PPO inactivation. Whether treated alone or combined with ultrasound, potassium sorbate would promote PPO activity when the concentration was less than 2000 mM.