Fig. 3.

Anti-biofilm activity of polyphenols on E. coli O157:H7. Polyphenolic compounds of gallic acid, caffeic acid, rutin, ferulic acid, quercetin, allyl ITC, benzyl ITC, phenyl ITC and phenylethyl ITC at different concentrations (white square: 5 ug/mL, light grey square: 10 ug/mL, grey square: 20 ug/mL, dark grey square: 50 ug/mL, black square:100 ug/mL). Results represent the survival rate (%) compared to the negative control by mean ± SD of the crystal violet assay (CV) experiments and are expressed as relative percent of negative control. Different alphabets within the same samples represent the significant difference at p < 0.05