Cited by 44Probiotics and Fermented FoodsListeria monocytogenes in Food SafetyInfant Nutrition and Health

Enhanced control of Listeria monocytogenes by Enterococcus faecium KE82, a multiple enterocin–producing strain, in different milk environments

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Vandera, Elpiniki, Lianou, Alexandra, Kakouri, Athanasia, Feng, Jinbo, Koukkou, Anna-Irini, Samelis, John·2017·Journal of Food Protection

Abstract

Enterococcus faecium KE82, isolated from traditional Greek Graviera cheese, was identified in pure broth cultures in vitro as a multiple enterocin-producing bacterial strain possessing the structural entA, entB, and entP enterocin genes. E. faecium KE82 was further assessed for in situ antilisterial activity in raw milk (RM) and commercially thermized milk (TM; 63°C for 30 s) in the presence of the indigenous microbiota and in sterile raw milk (SRM; 121°C for 5 min) with or without the addition of two commercial starter culture (CSC) strains Streptococcus thermophilus and Lactococcus lactis . Growth of Listeria monocytogenes was completely inhibited in RM incubated at 37°C for 6 h, whereas the pathogen was significantly inactivated in RM+KE82 samples during further incubation at 18°C for 66 h. In contrast, L. monocytogenes levels increased by approximately 2 log CFU/ml in TM, but in TM+KE82 samples, pathogen growth was retarded during the first 6 h at 37°C followed by growth cessation and partial inactivation at 18°C. After 48 to 72 h, growth of L. monocytogenes in SRM+CSC samples decreased by 4 to 5 log CFU/ml compared with the SRM control, whereas additional 10-fold decreases in the pathogen were observed in SRM+CSC+KE82 samples. Reverse transcription PCR analysis of SRM+KE82 and SRM+CSC+KE82 samples confirmed that the entA and entB genes were transcribed, but entP gene transcription was not detected. All RM and SRM samples inoculated with E. faecium KE82 displayed strong in situ inhibitory activity against L. monocytogenes in well diffusion bioassays, whereas activity was weaker to undetectable in comparable or additional TM+KE82 samples; no milk sample without E. faecium KE82 had activity against L. monocytogenes . The findings of this study indicate that E. faecium KE82 is an antilisterial agent that could be used in traditional dairy foods because it concomitantly produces enterocins A and B in situ in milk.

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  • Bacteriocin-producing LAB species such as L. plantarum, Streptococcus spp. and Enterococcus spp. have been shown to reduce L. monocytogenes and S. aureus contamination in various dairy products.

    “Such bacteriocin-producing LAB species as L. plantarum, Streptococcus spp. and Enterococcus spp. have been shown to reduce L. monocytogenes and S. aureus contamination in various dairy products [17,128,143,144,145,146].”

    From Lactic Acid Bacteria in Raw-Milk Cheeses: From Starter Cultures to Probiotic Functions (2022) · cites this paper as [145]

    The Results and Discussion (page unavailable) report that milk cultures containing the enterocin-producing Enterococcus faecium KE82 inhibited L. monocytogenes, though activity varied by milk treatment. This supports the Enterococcus–Listeria part of the multi-cited sentence. The paper does not establish reductions of S. aureus or demonstrate the claimed effects for L. plantarum or Streptococcus spp. (LLM, conf=0.88)

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Authors
Vandera, E., Lianou, A., Kakouri, A., Feng, J., Koukkou, A.-I., & Samelis, J.
Affiliations
University of Ioannina (GR)
Corresponding author
Samelis, John
Venue
Journal of Food Protection
Publisher
Elsevier BV
Published
2017-01
Volume
80
Issue
1
Pages
74-85
ISSN
0362-028X (ISSN-L)
OpenAlex
W2561879314
Cited by
44
References
47
Citations by year
2026: 2 · 2025: 4 · 2024: 6 · 2023: 6 · 2022: 6 · 2021: 4 · 2020: 4 · 2019: 1 · 2018: 8 · 2017: 1 · 2016: 2
FWCI
5.04
Type
journal article
Language
en
Open access
Locations
  • Journal of Food Protection (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • European Commission (FOOD-CT-2006-016264)
  • University of Ioannina
Topics
  • Life Sciences › Agricultural and Biological Sciences › Food Science › Probiotics and Fermented Foods
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biotechnology › Listeria monocytogenes in Food Safety
  • Health Sciences › Nursing › Nutrition and Dietetics › Infant Nutrition and Health
Keywords
Listeria monocytogenes, enterocins, antilisterial activity, raw milk, starter cultures, Streptococcus thermophilus, Lactococcus lactis, dairy microbiota, pathogen inactivation
MeSH terms
Animals, Bacteriocins, Bridged-Ring Compounds, Greece, Listeria monocytogenes, Milk, Enterococcus faecium

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