Vanillin derivative inhibits quorum sensing and biofilm formation in : a study in a infection model.

Vanillin and its derivative, (4-(()-(4-hydroxy-2-ethylphenylimino) ethyl)-2-methoxyhenol (MMP) were showed clear inhibition of violacein and pyocyanin at sub-MICs indicating a possible quorum quenching effect of both the compounds. MMP was able to inhibit the biofilm formation in PAO1 at 125 μg/mL ( 0.05), while vanillin at 250 μg/mL ( 0.05) indicating that they act against quorum sensing regulated biofilm formation. The inhibition of biofilm was confirmed by visualization through fluorescence microscopy followed by docking analysis of molecules against quorum sensing activator proteins. Caenorhabditis survival assay revealed that vanillin and MMP were able to increase survival of from PAO1 infection. The study showed that the potent features of the MMP and vanillin in inhibiting the quorum sensing regulated virulence and biofilm, which was proved in infection model as well as molecular docking studies.