Conditions affecting autoinducer-2-based quorum sensing of Escherichia coli O157:H7 on fresh beef.
- Authors
- Yoon, Y.; Sofos, J.N.
- Issue Date
- Nov-2008
- Publisher
- BLACKWELL PUBLISHING
- Citation
- JOURNAL OF FOOD SAFETY, v.28, no.4, pp 587 - 600
- Pages
- 14
- Journal Title
- JOURNAL OF FOOD SAFETY
- Volume
- 28
- Number
- 4
- Start Page
- 587
- End Page
- 600
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/148155
- DOI
- 10.1111/j.1745-4565.2008.00133.x
- ISSN
- 0149-6085
1745-4565
- Abstract
- This study evaluated whether inoculated (none, 1, 5 log colony-forming units [cfu]/cm(2)) Escherichia coli O157:H7 would result in detection of autoinducer (AI)-2-like activity on beef. Inoculated fresh beef, containing low (LNB) or high (HNB) initial levels of natural flora, was analyzed for bacterial populations and AI-2-like activity during aerobic or vacuum-packaged storage (4, 10, 25C). As expected, no growth of E. coli O157:H7 was detected at 4C, while at 10C, growth was detected only on LNB samples stored aerobically; AI-2-like activity was minimal (P >= 0.05) at both temperatures. E. coli O157:H7 showed more growth in LNB than HNB, and in aerobically than vacuum-packaged samples inoculated with 1 log cfu/cm(2) of the pathogen during storage at 25C. AI-2-like activity was generally higher in LNB than HNB samples stored aerobically at 25C, while no significant AI-2-like activity was detected in samples stored in vacuum packages. The results indicated that E. coli O157:H7 may exhibit AI-2-like activity on aerobically stored beef in the presence of lower initial levels of natural flora, and at temperatures allowing prolific growth of the pathogen. Thus, AI-2-based quorum-sensing of E. coli O157:H7 may not be of importance in beef stored at low temperatures.
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