期刊
FOOD RESEARCH INTERNATIONAL
卷 157, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.foodres.2022.111367
关键词
Listeria monocytogenes; FCMs; Biofilms; Bacteriophage; Virulence-related genes
资金
- National Research Foundation of Korea [2020R1F1A1067519]
- Chung-Ang University Academic scholarship for College of Biotechnology and Natural Resources
- National Research Foundation of Korea [2020R1F1A1067519] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study evaluated the biofilm eradication ability of a specific bacteriophage against Listeria monocytogenes biofilms and investigated the gene and structural changes after phage treatment. The results showed that the phage was able to effectively eliminate the biofilms and caused up-regulation of certain genes and changes in structural parameters.
Listeria monocytogenes is a foodborne pathogen that can form biofilms in food processing facilities even under unfavorable growth environment. This study aimed to evaluate the biofilm eradication ability of Listeria-specific bacteriophage (phage) cocktail (LMPC01+02+03) against L. monocytogenes young (1 day) and mature (3 days) biofilms formed on food contact materials (FCMs: polyethylene, polypropylene, and stainless steel) at 4, 15, and 30 degrees C. In addition, virulence-related genes and biofilm structure parameters of the phage-treated biofilms were investigated. The biofilm eradication ability of the phage cocktail was evaluated on 96 well and MBEC plate, and the results revealed that a multiplicity-of-infection (MOI) 100 of the phage cocktail exhibited the ability of eradicate biofilms. Using MOI 100, the phage cocktail treatment on the biofilms formed on FCMs for 8 h reduced over 2 log CFU/cm2 of the young biofilms, and approximately 1 log CFU/cm2 of the mature biofilms. In addition, the phage treatment against the biofilms resulted in a significant up-regulation of two genes (flaA and motB), and up/down-regulation or no changes in three genes (hlyA, prfA, and actA). Confocal and scanning electron microscopy images revealed the loss of the biofilm matrix after the phage treatment, and quantitative analysis revealed a reduction in the structural parameters of the biofilm, except the microcolonies at the substratum level, which increased. These results suggested that MOI 100 of the phage cocktail (LMPC01+02+03) was an effective tool for eradicating L. monocytogenes biofilms formed on FCMs, and it is essential to develop a countermeasure to eradicate the biofilm remaining after phage treatment.
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