Investigation of the mechanisms of Escherichia coli cells sterilization by the application of an electric field

  • N. Boudjema
  • M. Kherat
  • N. DrouicheEmail author
  • N. Mameri
Original Paper


The inactivation of microorganisms by an electric field was the purpose of this study. It was found that the application of an electric field had a lethal effect on Escherichia coli cells suspended in brain heart infusion broth. Experimental results indicated that the survival rate of E. coli decreased when an electric field with an intensity of 3A was applied during a time equal to 30 min. Mechanisms involved in the sterilization process were discussed. The concentration of proteins and N-acetylglucosamine (NAG) liberated by the cells during the experiment was recorded. The results indicated that the concentration of liberated proteins was 2.21 µg/ml after 5 min, and this concentration increased twofold after 45 min (4.10 µg/ml). The initial concentration of NAG was 0.084 µg/ml. It increased to 0.1 µg/ml after 5 min, to 0.2 µg/ml after 10 min and to 1.3 µg/ml after 30 min.


Electric field Escherichia coli bacteria Protein NAG Cell membrane 



This study was financially supported by the National Research Fund from DGRSDT/MESRS (Algeria).


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Copyright information

© Islamic Azad University (IAU) 2019

Authors and Affiliations

  • N. Boudjema
    • 1
    • 2
  • M. Kherat
    • 2
  • N. Drouiche
    • 3
    Email author
  • N. Mameri
    • 2
  1. 1.University of Blida 1SoumaaAlgeria
  2. 2.Environment and Engineering Research UnitURIE. BP. ElharrachAlgersAlgeria
  3. 3.Centre de Recherche en Technologie des Semi-conducteurs pour l’EnergetiqueAlgiersAlgeria

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