| Antimicrobial activity of epsilon-polylysine against Escherichia coli O157:H7, Salmonella Typhimurium, and Listeria monocytogenes in various food extracts. | |
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MedLine Citation:
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PMID: 17995614 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study compared the antimicrobial effects of epsilon-polylysine (epsilon-PL) against Escherichia coli O157:H7, Salmonella Typhimurium, and Listeria monocytogenes in 6 food extracts and in broth. The food extracts (10% (w/w) in distilled water) evaluated were fat-free and whole fat milk, beef, bologna, rice, and vegetables (50:50 ratio of broccoli and cauliflower). epsilon-PL was tested at 0.005% and 0.02% (w/v) against E. coli O157:H7 and L. monocytogenes, and 0.02% and 0.04% (w/v) against S. Typhimurium. The substrates were inoculated (5 log CFU/mL) and periodically analyzed for surviving populations during storage at 12 degrees C for 6 d. In general, all 3 pathogens reached 7 to 9 log CFU/mL within 2 d in control substrates (no epsilon-PL). Immediate bactericidal effects (P < 0.05) following exposure to epsilon-PL were obtained in the rice (all pathogens) and vegetable (E. coli O157:H7 and S. Typhimurium) extracts. During storage, antimicrobial effects of epsilon-PL were more pronounced in the food extracts than in the broth medium. The greatest antimicrobial activity for all 3 pathogens was obtained in the rice and vegetable extracts, where counts were reduced (P < 0.05) to below the detection limit (0.0 log CFU/mL) by one or both epsilon-PL concentrations tested. In the other food extracts (fat-free milk, whole fat milk, beef, and bologna), both epsilon-PL concentrations tested generally resulted in lower (P < 0.05) pathogen levels at the end of storage compared to initial counts, with better bactericidal effects exerted by the higher of the 2 epsilon-PL concentrations. Additional research is needed to explore the potential antimicrobial effects of epsilon-PL in real food systems. |
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Authors:
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I Geornaras; Y Yoon; K E Belk; G C Smith; J N Sofos |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of food science Volume: 72 ISSN: 1750-3841 ISO Abbreviation: J. Food Sci. Publication Date: 2007 Oct |
Date Detail:
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Created Date: 2007-11-12 Completed Date: 2008-01-25 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0014052 Medline TA: J Food Sci Country: United States |
Other Details:
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Languages: eng Pagination: M330-4 Citation Subset: IM |
Affiliation:
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Center for Red Meat Safety, Dept. of Animal Sciences, Colorado State Univ., 1171 Campus Delivery, Fort Collins, CO 80523-1171, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Anti-Bacterial Agents
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pharmacology* Colony Count, Microbial Consumer Product Safety Dose-Response Relationship, Drug Escherichia coli O157 / drug effects*, growth & development Food Contamination / analysis, prevention & control* Food Microbiology Food Preservation / methods Humans Listeria monocytogenes / drug effects*, growth & development Polylysine / pharmacology* Salmonella typhimurium / drug effects*, growth & development Temperature Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Anti-Bacterial Agents; 25104-18-1/Polylysine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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