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.
Highlights
Chinese winter jujube (Zizyphus jujuba Miller) is indigenous to China with a history of over 4000 years (Wang et al, 2009)
Inactivation of natural microorganisms in jujube juice: To determine the effect of Dense Phase Carbon Dioxide (DPCD) on inactivation of natural microorganisms, samples were exposed to DPCD at different pressure (5 to 30 MPa) and different treatment time (0 to 50 min) at 25°C
At certain temperature (25°C), the inactivation of natural microorganisms exposed to DPCD was significantly increased (p
Summary
Chinese winter jujube (Zizyphus jujuba Miller) is indigenous to China with a history of over 4000 years (Wang et al, 2009) It has been widely planted in China for its high nutritional value, good taste (Li et al, 2007; Zhu et al, 2009). DPCD has been reported to inactivate different microorganisms in liquid foods without exposing them to the adverse effects of heat which allows retain their fresh-like physical, nutritional and sensory properties (Yuk et al, 2010). It has been proven effective in inactivating many undesirable enzymes including Polyphenoloxidas (PPO) and Peroxidase (POD) (Niu et al, 2010; Carmen et al, 2013). The objectives of the present study were to investigate the feasibility of inactivating microorganisms, PPO and POD in Chinese winter jujube juice by DPCD treatment and to understand some quality attributes of Chinese winter jujube juice after DPCD treatment
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