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Lactobacillus spp. inhibit the growth of Cronobacter sakazakii ATCC 29544 by altering its membrane integrity

  • Raffaella CampanaEmail author
  • Sara Federici
  • Eleonora Ciandrini
  • Anita Manti
  • Wally Baffone
Short Communication
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Abstract

The effect of the cell-free culture supernatants (CFCSs) from different Lacobacillus spp. on growth ability of Cronobacter sakazakii ATCC 29544 was investigated by time-killing studies. The antimicrobial effect was evaluated using crude and 2.5 × concentrated CFCSs. Most of the CFCSs showed a dose-dependent antimicrobial activity, with the greatest C. sakazakii growth inhibition exerted by the CFCS 2.5 × of Lactobacillus casei rhamnosus ATCC 7469. Indeed, C. sakazakii growth was completely inhibited after 4 h of incubation with the crude CFCSs of L. casei rhamnosus and Lactobacillus acidophilus and after only 2 h using the related 2.5 × CFCSs. The flow cytometric analysis revealed that CFCSs altered the permeability of C. sakazakii cell membrane, showing 55% of live cells after 30 min of treatment with 2.5 × CFCSs of L. casei rhamnosus and L. acidophilus, reaching 1% of live cells after 2 h of exposure. The CFCSs of L. casei rhamnosus and L. acidophilus have showed anti-Cronobacter activity, determining a progressively inhibition of C. sakazakii growth as result of alterations in its membrane permeability.

Keywords

Lactobacilli Cell-free culture supernatants Antimicrobial activity C. sakazakii Membrane integrity Flow cytometry 

Notes

Authors’ contributions

WB conceive the study and RC designed the experiments; SF, EC and RC performed the experiments and analysed data; AM carried out FCM analysis; RC and WB wrote the manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Association of Food Scientists & Technologists (India) 2019

Authors and Affiliations

  1. 1.Division of Toxicological, Hygiene and Environmental Sciences, Department of Biomolecular SciencesUniversity of Urbino “Carlo Bo”UrbinoItaly

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