Influence of treatment temperature on the inactivation of Listeria innocua by pulsed electric fields |
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| Affiliation: | 1. Département de Génie Électrique, Faculté de Technologie, Université de Bejaia, 06000 Bejaia, Algeria;2. APELEC Laboratory, Djillali Liabes University of Sidi Bel-Abbes, Sidi Bel-Abbes, Algeria;3. University of Ljubljana, Faculty of Electrical Engineering, Tržaška 25, SI-1000 Ljubljana, Slovenia;1. Wageningen UR Food & Biobased Research, P.O. Box 17, 6700 AA Wageningen, The Netherlands;2. Food Quality & Design Group, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands;1. Institute of High Magnetic Fields, Vilnius Gediminas Technical University, Naugarduko g 41, 03227, Vilnius, Lithuania;2. Laboratory of Genetics, Institute of Botany, Nature Research Centre, Akademijos g. 2, 08412, Vilnius, Lithuania;3. Institute of Applied Research, Vilnius University, Saulėtekio al. 9, 10222, Vilnius, Lithuania;4. Department of Polymer Chemistry, Vilnius University, Naugarduko 24, 03225, Vilnius, Lithuania;5. Department of Chemistry and Bioengineering, Vilnius Gediminas Technical University, Saulėtekio al. 11, 10223, Vilnius, Lithuania;1. Laboratory of Bio-Nanotechnology, State Research Institute, Center for Physical Sciences and Technology, Sauletekio ave. 3, LT-10257 Vilnius, Lithuania;2. High Power Pulse Laboratory, State Research Institute, Center for Physical Sciences and Technology, Sauletekio ave. 3, LT-10257 Vilnius, Lithuania;3. State Research Institute Center for Innovative Medicine, Santariškių 5, LT-08406 Vilnius, Lithuania;4. Department of Microbiology and Biotechnology, Faculty of Natural Sciences, Vilnius University, Sauletekio ave. 7, LT-10257 Vilnius, Lithuania |
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| Abstract: | The effect of treatment temperature on the bactericidal effectiveness of pulsed electric fields (PEF) applied on Listeria innocua suspended in McIllvaine buffer was investigated. Electric field intensity and number of applied pulses were applied in the ranges of 31–40 kV/cm and 5–35 pulses, respectively. Studied treatment temperatures were sustained for 10 s, and ranged between 19°C and 59°C depending on the amount of energy delivered by the PEF treatment. The application of PEF at higher temperatures proved to be more effective than either PEF at low temperatures or the applied thermal treatments by themselves. A maximum bacterial inactivation of 6-log cycles was obtained by applying either: 20 pulses of 40 kV/cm at 65°C, 25 pulses of 36 kV/cm at 61°C, or 31 pulses of 31 kV/cm at 56°C. On the other hand, a thermal treatment of 66°C sustained for 30 s reduced the bacterial population on its own by only 5-log cycles, and the application of 60 pulses of 31 kV/cm at 30°C caused only 3-log cycles of bacterial inactivation. The findings in this study suggest that PEF technology may be effectively used as an enhanced mild thermal preservation method. |
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