Summary
The aim of this paper was to evaluate the possible enhancement of the biocidal efficacy of glutaraldehyde against Pseudomonas fluorescens biofilms by the application of an electric field. The behaviour of sessile cells and cells released by the biofilms was assed. Biofilms were formed on thin stainless steel coupons immersed in culture media inoculated with Pseudomonas fluorescens. Treatments using glutaraldehyde (TGA) and both glutaraldehyde and electric field application (TGAEF) were carried out with the samples with biofilms. TGA: samples with biofilms were immersed in glass cells containing a buffer solution with different glutaraldehyde concentrations in the 25–500 ppm range. TGAEF: samples with biofilms were immersed in an electrochemical cell containing glutaraldehyde solution where a direct electric current (4 × 10−4 A cm−2) was delivered to the chamber. The evolution of biofilms was observed through optical microscopy at real time. Results show that the electric field enhanced glutaraldehyde efficacy reducing the number of surviving cells in the range of one to four orders with respect to those with TGA treatment. The sensitivity of the cells to the treatments decreased in the following order: planktonic cells > cells released by the biofilm > sessile cells.
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Gómez de Saravia, S., de Lorenzo Mele, M. Enhancement of Glutaraldehyde Biocidal Efficacy by the Application of an Electric Field. Effect on Sessile Cells and on Cells Released by the Biofilm. World J Microbiol Biotechnol 21, 1077–1081 (2005). https://doi.org/10.1007/s11274-004-8288-1
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DOI: https://doi.org/10.1007/s11274-004-8288-1