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Barros CP, Pires RPS, Guimarães JT, Abud YKD, Almada CN, Pimentel TC, Sant'Anna C, De-Melo LDB, Duarte MCKH, Silva MC, Sant'Ana AS, Freitas MQ, Cruz AG. Ohmic heating as a method of obtaining paraprobiotics: Impacts on cell structure and viability by flow cytometry. Food Res Int 2020; 140:110061. [PMID: 33648284 DOI: 10.1016/j.foodres.2020.110061] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 12/09/2020] [Accepted: 12/17/2020] [Indexed: 12/14/2022]
Abstract
This study aimed to evaluate the effects of ohmic heating (OH) on probiotic inactivation, cell viability and morphology of the probiotic strains Lactobacillus acidophilus LA 05 (LA), Lacticaseibacillus casei 01 (LC), and Bifidobacterium animalis Bb 12 (BA) to develop paraprobiotics. OH at different electric field magnitudes (4, 8, and 12 V/cm at 60 Hz) and conventional heat treatment (CONV) were performed to determine the most adequate condition for the obtainment of paraprobiotics. Analysis of culturability, flow cytometry (FC), and Scanning electron microscope (SEM) was carried out. The complete inactivation by CONV was achieved only in the following conditions: LA - 95 °C/5 min, LC and BA - 95 °C/7 min. The same temperature profile was used in OH treatments to study the OH electrical effects. The OH treatment (8 V/cm) caused lower damage to the cell membrane integrity compared to the CONV treatment (p < 0.05). The OH showed to be adequate technology for the efficient production of paraprobiotics.
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Affiliation(s)
- Cássia P Barros
- Department of Food Technology, Faculty of Veterinary, Fluminense Federal University, Niterói, RJ, Brazil
| | - Roberto P S Pires
- Department of Food, Federal Institute of Science and Technology of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Jonas T Guimarães
- Department of Food Technology, Faculty of Veterinary, Fluminense Federal University, Niterói, RJ, Brazil.
| | - Yuri K D Abud
- National Institute of Metrology, Quality and Technology, Duque de Caxias, RJ, Brazil
| | - Caroline N Almada
- Department of Food Science, Faculty of Food Engineering, University of Campinas, Campinas, SP, Brazil
| | | | - Celso Sant'Anna
- National Institute of Metrology, Quality and Technology, Duque de Caxias, RJ, Brazil
| | - Luiz Dione B De-Melo
- Department of Food, Federal Institute of Science and Technology of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Maria Carmela K H Duarte
- Department of Food Technology, Faculty of Veterinary, Fluminense Federal University, Niterói, RJ, Brazil
| | - Márcia C Silva
- Department of Food, Federal Institute of Science and Technology of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Anderson S Sant'Ana
- Department of Food Science, Faculty of Food Engineering, University of Campinas, Campinas, SP, Brazil
| | - Mônica Q Freitas
- Department of Food Technology, Faculty of Veterinary, Fluminense Federal University, Niterói, RJ, Brazil
| | - Adriano G Cruz
- Department of Food, Federal Institute of Science and Technology of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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