Abstract

Chinese winter jujube juice was treated with Dense Phase Carbon Dioxide (DPCD) to inactivate microorganisms, Polyphenoloxidase (PPO) activity, Peroxidase (POD) activity and control browing. The effect of varying pressures (5 to 30 MPa) and different treatment time (0 to 50 min) on the amount of natural microorganisms, PPO activity, POD activity and browning degree were measured. After experiment, the inactivation of natural microorganisms, PPO activity and POD activity exposed to DPCD were significantly increased with increasing pressure. Treated jujube juice had lower browning degree than untreated jujube juice. The experimental results showed that the DPCD treatment can be regarded as a good pretreatment means for winter jujube juice processing.

Keywords:

Chinese winter jujube, dense phase carbon dioxide, enzymatic browning, juice, microorganism,

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The authors have no competing interests.

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