Inactivation and structural changes of polyphenol oxidase in quince (<scp><i>Cydonia oblonga</i></scp> Miller) juice subjected to ultrasonic treatment

Abstract

In summary, ultrasonic treatment triggered protein aggregation, distortion of tertiary structure, and loss of α-helix conformation of secondary structure causing inactivation of the PPO enzyme. Hence, ultrasound processing at high intensity and duration could cause the inactivation of the PPO enzyme by inducing aggregation and structural modifications. © 2019 Society of Chemical Industry.