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2018 ; 13
(5
): e0195023
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Bacteriophage cocktail for biocontrol of Escherichia coli O157:H7: Stability and
potential allergenicity study
#MMPMID29763937
Ramirez K
; Cazarez-Montoya C
; Lopez-Moreno HS
; Castro-Del Campo N
PLoS One
2018[]; 13
(5
): e0195023
PMID29763937
show ga
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.