Inhibition of in vitro growth of Shiga toxin-producing Escherichia coli O157:H7 by probiotic Lactobacillus strains due to production of lactic acid

Int J Food Microbiol. 2001 Aug 15;68(1-2):135-40. doi: 10.1016/s0168-1605(01)00465-2.


The inhibiting characteristics of lactic acid bacteria on Shiga toxin-producing Escherichia coli (STEC) O157:H7 (three strains, clinically isolated) was investigated by using a batch fermentation system. The species such as Lactobacillus casei strain Shirota or L. acidophilus YIT 0070 exert growth inhibitory and bactericidal activities on STEC. The pH value and undissociated lactic acid (U-LA) concentration of the culture medium of STEC cocultured with L. casei or L. acidophilus dramatically lowered or increased, respectively [corrected], when compared with those of the control culture. The cytotoxic properties of U-LA on STEC strain 89020087 analyzed in vitro was divided into two phases, i.e., the bacteriostatic phase (between 3.2 to 62 mM) and the bactericidal phase (over 62 mM). These data suggest that the bactericidal effect of Lactobacillus on STEC depends on its lactic acid production and pH reductive effect.

MeSH terms

  • Escherichia coli O157 / drug effects
  • Escherichia coli O157 / growth & development*
  • Escherichia coli O157 / metabolism
  • Fermentation
  • Hydrogen-Ion Concentration
  • Kinetics
  • Lactic Acid / pharmacology*
  • Lactobacillus / metabolism*
  • Probiotics
  • Shiga Toxins / biosynthesis


  • Shiga Toxins
  • Lactic Acid