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KMID : 1007520210300040599
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Food Science and Biotechnology
2021 Volume.30 No. 4 p.599 ~ p.607
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Eugenol, citral, and hexanal, alone or in combination with heat, affect viability, biofilm formation, and swarming on Shiga-toxin-producing Escherichia coli
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Caballero-Prado Cindy Joanna
Merino-Mascorro Jose Angel
Heredia Norma
Davila-Avina Jorge
Garcia Santos
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Abstract
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Shiga-toxin-producing Escherichia coli strains are pathogenic for humans and cause mild to severe illnesses. In this study, the antimicrobial effect of citral, eugenol, and hexanal in combination with heat shock (HS) was evaluated in terms of the growth, biofilm formation, swarming, and expression of virulence genes of STEC serotypes (O157:H7, O103, O111, and O26). Eugenol was the most effective compound against the growth of E. coli strains (MBC?=?0.58 to 0.73 mg/mL), followed by citral (MBC?=?0.86 to 1.26 mg/mL) and hexanal (MBC?=?2.24 to 2.52 mg/mL). Biofilm formation and swarming motility have great variability between STEC strains. Natural compounds?alone or combined with HS?inhibited biofilm formation; however, swarming motility was induced by most treatments. The expression of the studied genes during biofilm formation and swarming under natural antimicrobials was affected but not in a uniform pattern. These treatments could be used to control contamination of STEC and inhibit biofilm formation.
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KEYWORD
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Escherichia coli, Natural product, STEC, Virulence factor, Biofilm, Swarming
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