Abstract
Biocides are widely used for the mitigation of microbial contamination, especially in the field of the aviation fuel industry. However, the long-term use of biocide has raised the concerns regarding the environmental contamination and microbial drug resistance. In this study, the effect of a mixture of D-amino acids (D-tyrosine and D-methionine) on the enhancement of the bactericidal effect of 5-Chloro-2-Methyl-4-isothiazolin-3-one/2-Methyl-2H-isothiazole-3-one (CMIT/MIT) against corrosive Vibrio harveyi biofilm was evaluated. The results revealed that D-Tyr and D-Met alone can enhance the biocidal efficacy of CMIT/MIT, while the treatment of 5 ppm CMIT/MIT, 1 ppm D-Tyr and 100 ppm D-Met showed the best efficacy comparable to that of 25 ppm CMIT/MIT alone. The triple combination treatment successfully prevented the establishment of the corrosive V. harveyi biofilm and effectively removed the mature V. harveyi biofilm. These conclusions were confirmed by the results of sessile cell counts, images obtained by scanning electron microscope and confocal laser scanning microscope, and the ATP test kit.
Highlights
The problem of microbial contamination of aircraft fuel tanks has been noticed by the international aviation industry for several decades (Skribachilin et al, 1993; Passman, 2013)
Since the Rp value is inversely proportional to the corrosion rate, the presence of V. harveyi significantly decreased the Rp values of aluminum alloy 2024 (AA2024), indicating the accelerated corrosion of AA2024 coupons caused by V. harveyi biofilm
The potentiodynamic polarization results further confirmed that corrosion of AA2024 was accelerated by V. harveyi biofilm
Summary
The problem of microbial contamination of aircraft fuel tanks has been noticed by the international aviation industry for several decades (Skribachilin et al, 1993; Passman, 2013). International aviation accidents occur every year due to the microbial contamination of fuel system (Kosseva and Stanchev, 1994; McNamara et al, 2005; Cole and Paterson, 2009). To solve this issue, biocides have been widely used to control the microbial contamination in the field of aviation fuel systems (Bücker et al, 2014). 5-Chloro-2-Methyl-4-isothiazolin-3-one/2-Methyl-2H-isothiazole-3-one (CMIT/MIT) is commonly used in the fuel systems because of its broad spectrum and excellent
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