IJEP 41(3): 333-329 : Vol. 41 Issue. 3 (March 2021)
1. Karpagam Academy of Higher Education, Department of Biotechnology, Coimbatore – 641 021, India
2. Alagappa University, Department of Biotechnology, Karaikudi – 630 003, India
3. Central Electrochemical Research Institute (CSIR), Corrosion Prevention Division, Karaikudi – 630 006, India
Microbial colonization causes damage to the integrity of metal surfaces which lead to microbiologically influenced corrosion (MIC). Consequently, it becomes a serious problem for aquatic and marine industries globally. Despite the availability of biocides to control corrosion, most of them are ineffective due to its toxicity. Hence, to address the problems with toxic biocides, in the present study, the anticorrosion activity of a quorum quencher molecule methyl geranate (MG) known to interfere with bacterial signaling was investigated. Experimental stainless steel (SS-316) coupons were submerged in pond water for 10-30 days in the laboratory. Biocorrosion was evaluated by determining the structure of the biofilm covered on stainless steel (SS 316) coupons submerged in pond water by scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM) and fluorescence microscopy imaging of the coupon surface. Adding up, MG significantly reduced the secretion of biofilm EPS by 57% without affecting the bacterial growth. MG treated stainless steel coupons indicated the reduced oxygen reduction current at the metal surface as evident from applied electrode potential measurements which was associated with significant changes in the composition of bacterial biofilms on the steel surfaces. These results demonstrate the potential of the quorum quencher MG to prevent biocorrosion on metal surface.
Biofilm, Biocorrosion, Quorum sensing, Quorum quenching, Methyl geranate
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