Brazilian Journal of Microbiology

, Volume 50, Issue 1, pp 33–42 | Cite as

Characterization and safety evaluation of partially purified bacteriocin produced by Escherichia coli E isolated from fermented pineapple Ananas comosus (L.) Merr

  • Van Thi Le
  • Montira LeelakriangsakEmail author
  • Seong Wei Lee
  • Somrak Panphon
  • Kusumawadee Utispan
  • Sittichai Koontongkaew
Biotechnology and Industrial Microbiology - Research Paper


Antibacterial activity of cell-free supernatant from Escherichia coli E against selected pathogenic bacteria in food and aquaculture was the highest against Edwardsiella tarda 3, a significant aquaculture pathogen. Biochemical properties of the bacteriocins were studied and bacteriocin was found to be sensitive to proteinase K, demonstrating its proteinaceous nature. In addition, pH and temperature affected bacteriocin activity and stability. The bacteriocins were partially purified by ammonium sulfate precipitation. The antibacterial activity was only detected in 20% ammonium sulfate fraction and direct detection of its activity was performed by overlaying on the indicator strains. The inhibition zone associated with the antibacterial activity was detected in the sample overlaid by E. tarda 3 and Staphylococcus aureus DMST8840 with the relative molecular mass of about 27 kDa and 10 kDa, respectively. Bacteriocin showed no cytotoxic effect on NIH-3T3 cell line; however, two virulence genes, aer and sfa, were detected in the genome of E. coli E by PCR. The characteristics of bacteriocins produced by E. coli E exhibited the antibacterial activity against both Gram-positive and Gram-negative pathogenic bacteria and the safe use determined by cytotoxicity test which may have interesting biotechnological applications.


Bacteriocin Cytotoxicity assay Escherichia coliSafety evaluation Virulence genes 


Funding information

This work was supported by a grant from Faculty of Science and Technology, Prince of Songkla University, SAT-ASEAN 5602 and SAT-ASEAN scholarship for international students 2013 to V.T. Le. Thanks are due to the Minister of Education, Malaysia, under Niche Research Grant Scheme (NRGS) vot no: R/NRGS/A0.700/00387A/006/2014/00152 for funding.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

42770_2018_14_Fig7_ESM.png (393 kb)
Fig. S1

Quadruplex PCR profile of Clermont phylo-typing method. Lane 1, group F (E. coli E, - + - -); lane 2 negative control. M, DNA ladder (GeneRuler 100 bp, Thermo ScientificTM). The chuA, yjaA, TspE4.C2 and arpA primers were used for quadruplex PCR. (PNG 392 kb)

42770_2018_14_MOESM1_ESM.tif (784 kb)
High Resolution Image (TIF 783 kb)


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Copyright information

© Sociedade Brasileira de Microbiologia 2018

Authors and Affiliations

  • Van Thi Le
    • 1
  • Montira Leelakriangsak
    • 1
    Email author
  • Seong Wei Lee
    • 2
  • Somrak Panphon
    • 1
  • Kusumawadee Utispan
    • 3
  • Sittichai Koontongkaew
    • 3
  1. 1.Biology Division, Department of Science, Faculty of Science and TechnologyPrince of Songkla UniversityPattaniThailand
  2. 2.Faculty of Agro Based IndustryUniversiti Malaysia Kelantan Campus JeliJeliMalaysia
  3. 3.Faculty of DentistryThammasat UniversityPathumthaniThailand

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