Orange juice processing using a continuous flow ultrasound-assisted supercritical CO2 system: Microbiota inactivation and product quality

Add time:07/23/2019    Source:sciencedirect.com

The feasibility of using supercritical CO2 assisted by ultrasound (SC-CO2-HPU) in continuous mode (3.06 min residence time) for the non-thermal pasteurization of orange juice was evaluated. The proposed technology was effective for microbial inactivation; complete inactivation was obtained for E. coli and total aerobic mesophilic bacteria while 99.7% reduction for S. cerevisiae. Results showed that the SC-CO2-HPU treatment brought about small changes in the pH, °Brix and titratable acidity of the juice. Furthermore, although SC-CO2-HPU technology produced a higher browning index (211%) and greater changes in color, it was possible to improve the cloud of juice by 173%; what is more, a smaller percentage of phenolic compounds (6.5%) and ascorbic acid (5.5%) was lost compared to the thermally pasteurized juice (10% decrease in both parameters). Moreover, the antioxidant capacity could be increased (12%) with respect to the natural juice. Therefore, SC-CO2-HPU technology appears to be effective for microbial pasteurization and the mild process conditions used could lead to an increase in the juice quality.

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