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Inactivation of polyphenol oxidase from frozen red raspberry (Rubus idaeus L.) by high pressure carbon dioxide treatment

Author:
Liu, Ye  Zhang, Chao  Zhao, Xiao Y.  Ma, Yue  Li, Wu  Liao, Xiao J.  Hu, Xiao S.  


Journal:
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY


Issue Date:
2010


Abstract(summary):

P>The effect of high pressure carbon dioxide (HPCD) treatment on polyphenol oxidase (PPO) from frozen red raspberry (Rubus idaeus L.) was evaluated. Moreover, the inactivation kinetics of its PPO was simulated by first-order reaction theory. The minimum of PPO residual rate was 36.6% under 30 MPa and 55 degrees C for 60 min by HPCD treatment, while that was 66.8% at 55 degrees C for 60 min by thermal treatment. Moreover, the decimal reduction time of PPO decreased rapidly after HPCD treatment, compared to that of the thermal treatment. The thermal treatment at 55 degrees C takes a similar time to reach 10% PPO residual rate with HPCD treatment under 30 MPa at 35 degrees C. One reason for the results was that activation energy of PPO reduced from 98.9 to 14.6 kJ mol-1 after HPCD treatment. Therefore, HPCD treatment showed stronger capacity to inactivate PPO from frozen red raspberry than the thermal treatment at same temperature.


Page:
800---806


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