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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

Food Science and Biotechnology 2021년 30권 4호 p.599 ~ 607
Caballero-Prado Cindy Joanna, Merino-Mascorro Jose Angel, Heredia Norma, Davila-Avina Jorge, Garcia Santos,
소속 상세정보
 ( Caballero-Prado Cindy Joanna ) - Universidad Autonoma de Nuevo Leon Facultad de Ciencias Biologicas
 ( Merino-Mascorro Jose Angel ) - Universidad Autonoma de Nuevo Leon Facultad de Ciencias Biologicas
 ( Heredia Norma ) - Universidad Autonoma de Nuevo Leon Facultad de Ciencias Biologicas
 ( Davila-Avina Jorge ) - Universidad Autonoma de Nuevo Leon Facultad de Ciencias Biologicas
 ( Garcia Santos ) - Universidad Autonoma de Nuevo Leon Facultad de Ciencias Biologicas

Abstract


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.

키워드

Escherichia coli; Natural product; STEC; Virulence factor; Biofilm; Swarming

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