Abstract
Effects of pulsed electric filed (PEF) processing combined with heating (H-PEF processing) on the inactivation of microorganisms and the physicochemical properties of mixed mandarin and Hallabong tangor (MH) juice were studied. Using a pilot-scale PEF system, MH juice, pre-heated at 55 °C, was PEF-treated at 19 kV/cm of electric field and 170 kJ/L of specific energy and the juice, pre-heated at 70 °C, was PEF-treated at 16 kV/cm and 100 kJ/L or 12 kV/cm and 150 kJ/L. H-PEF processing at 70 °C–16 kV/cm–100 kJ/L reduced the aerobe, yeast/mold, and coliform counts of MH juice by 3.9, 4.3, and 0.8 log CFU/mL, respectively, without affecting the ascorbic acid concentration and antioxidant capacity of juice. H-PEF processing changed juice color and browning degree (p < 0.05), but not total soluble solid content or pH. By controlling initial juice temperature and electric field strength, H-PEF processing can be an effective pasteurization method for mixed juice with minimal changes in quality.
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Acknowledgements
This research was financially supported by the Ministry of Trade, Industry, and Energy (MOTIE), Korea, under the “Regional Specialized Industry Development Program (R&D, R0003894)” supervised by the Korea Institute for Advancement of Technology (KIAT) and by a research grant from Seoul Women’s University (2018).
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Lee, S.J., Bang, I.H., Choi, HJ. et al. Pasteurization of mixed mandarin and Hallabong tangor juice using pulsed electric field processing combined with heat. Food Sci Biotechnol 27, 669–675 (2018). https://doi.org/10.1007/s10068-018-0311-7
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DOI: https://doi.org/10.1007/s10068-018-0311-7