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Bacteriophage cocktail for biocontrol of Escherichia coli O157:H7: Stability and potential allergenicity study
Escherichia coli O157:H7 has become a global public health and a food safety problem. Despite the implementation of control strategies that guarantee the safety in various products, outbreaks persist and new alternatives are necessary to reduce this pathogen along the food chain. Recently, our group...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5953568/ https://www.ncbi.nlm.nih.gov/pubmed/29763937 http://dx.doi.org/10.1371/journal.pone.0195023 |
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author | Ramirez, Karina Cazarez-Montoya, Carmina Lopez-Moreno, Hector Samuel Castro-del Campo, Nohelia |
author_facet | Ramirez, Karina Cazarez-Montoya, Carmina Lopez-Moreno, Hector Samuel Castro-del Campo, Nohelia |
author_sort | Ramirez, Karina |
collection | PubMed |
description | Escherichia coli O157:H7 has become a global public health and a food safety problem. Despite the implementation of control strategies that guarantee the safety in various products, outbreaks persist and new alternatives are necessary to reduce this pathogen along the food chain. Recently, our group isolated and characterised lytic bacteriophages against E. coli O157:H7 with potential to be used as biocontrol agents in food. To this end, phages need certain requirements to allow their manufacture and application. The aim of this study was to determine the physical stability and allergenic potential of free and microencapsulated (ME) bacteriophage cocktails against E. coli O157:H7. In vitro and in vivo studies were performed to determine phage survival under different pH, gastrointestinal conditions, temperature and UV light intensities. Results showed that the stability of ME phages was significantly (P<0.05) higher than free phages after ultraviolet irradiation, pH conditions between 3 to 7, and exposure to temperatures between at -80°C and 70°C. Both formulations were highly sensitive to very low pH in simulated gastric fluid, but stable in bile salts. In vivo studies in mice confirmed these phages passed through the gastrointestinal tract and were excreted in faeces. In silico, full-length alignment analysis showed that all phage proteins were negative for allergenic potential, but different predicting criteria classified seven phage proteins with a very low probability to be an allergen. In conclusion, these data demonstrated that microencapsulation provided a greater stability to phage formulation under stress conditions and assure a more suitable commercial formulation for the biological control of E. coli O157:H7. |
format | Online Article Text |
id | pubmed-5953568 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-59535682018-05-25 Bacteriophage cocktail for biocontrol of Escherichia coli O157:H7: Stability and potential allergenicity study Ramirez, Karina Cazarez-Montoya, Carmina Lopez-Moreno, Hector Samuel Castro-del Campo, Nohelia PLoS One Research Article Escherichia coli O157:H7 has become a global public health and a food safety problem. Despite the implementation of control strategies that guarantee the safety in various products, outbreaks persist and new alternatives are necessary to reduce this pathogen along the food chain. Recently, our group isolated and characterised lytic bacteriophages against E. coli O157:H7 with potential to be used as biocontrol agents in food. To this end, phages need certain requirements to allow their manufacture and application. The aim of this study was to determine the physical stability and allergenic potential of free and microencapsulated (ME) bacteriophage cocktails against E. coli O157:H7. In vitro and in vivo studies were performed to determine phage survival under different pH, gastrointestinal conditions, temperature and UV light intensities. Results showed that the stability of ME phages was significantly (P<0.05) higher than free phages after ultraviolet irradiation, pH conditions between 3 to 7, and exposure to temperatures between at -80°C and 70°C. Both formulations were highly sensitive to very low pH in simulated gastric fluid, but stable in bile salts. In vivo studies in mice confirmed these phages passed through the gastrointestinal tract and were excreted in faeces. In silico, full-length alignment analysis showed that all phage proteins were negative for allergenic potential, but different predicting criteria classified seven phage proteins with a very low probability to be an allergen. In conclusion, these data demonstrated that microencapsulation provided a greater stability to phage formulation under stress conditions and assure a more suitable commercial formulation for the biological control of E. coli O157:H7. Public Library of Science 2018-05-15 /pmc/articles/PMC5953568/ /pubmed/29763937 http://dx.doi.org/10.1371/journal.pone.0195023 Text en © 2018 Ramirez et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Ramirez, Karina Cazarez-Montoya, Carmina Lopez-Moreno, Hector Samuel Castro-del Campo, Nohelia Bacteriophage cocktail for biocontrol of Escherichia coli O157:H7: Stability and potential allergenicity study |
title | Bacteriophage cocktail for biocontrol of Escherichia coli O157:H7: Stability and potential allergenicity study |
title_full | Bacteriophage cocktail for biocontrol of Escherichia coli O157:H7: Stability and potential allergenicity study |
title_fullStr | Bacteriophage cocktail for biocontrol of Escherichia coli O157:H7: Stability and potential allergenicity study |
title_full_unstemmed | Bacteriophage cocktail for biocontrol of Escherichia coli O157:H7: Stability and potential allergenicity study |
title_short | Bacteriophage cocktail for biocontrol of Escherichia coli O157:H7: Stability and potential allergenicity study |
title_sort | bacteriophage cocktail for biocontrol of escherichia coli o157:h7: stability and potential allergenicity study |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5953568/ https://www.ncbi.nlm.nih.gov/pubmed/29763937 http://dx.doi.org/10.1371/journal.pone.0195023 |
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