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07513 Effect of Cathodic Protection on Biofilm Formation and Maturation

Picture for 07513 Effect of Cathodic Protection on Biofilm Formation and Maturation
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Product Number: 51300-07513-SG
ISBN: 07513 2007 CP
Author: Yasunori Tanji, Hirofumi Kawai, Ryosuke Terashi, and Kazuhiko Miyanaga
Publication Date: 2007
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Cathodic protection (CP) is known as a reliable method to protect steel from corrosion. However, the influence of CP on biofilm formation and maturation is not well known. There are three possible effects of CP on biofilm formation and maturation. Those are: 1) deprivation of anchorage sites for bacterial adhesion, 2) increase of electrostatic repulsion between the steel surface and negatively charged bacteria, 3) elimination of bacteria in the biofilm by increasing pH. To investigate these possible effects of CP on biofilm, carbon steel coupons were immersed in artificial seawater with and without CP. CP retarded steel corrosion, as a consequence of inhibition of biofilm formation. CP also inhibited initial attachment of Pseudomonas aeruginosa PAO1, a strain well known for its negative charge and pioneering adhesive characteristics. Since the inhibitive effect of cell adhesion was greater in low ionic conditions than in high ionic conditions, CP increased electrical repulsion between the steel surface and bacteria. The increase of pH in an artificial biofilm composed of 0.5% agar and 0.9% NaCl was also investigated theoretically and experimentally. The pH profile in the artificial biofilm was analyzed using a capillary pH electrode. After three hours of CP, the biofilm pH increased and as a consequence sterilized P. aeruginosa PAO1 imbedded in the film. However, pH at the edge of the biofilm decreased sharply and reached the same value as that in the bulk-water. Therefore, bacteria located at the edge of the biofilm survived during the application of CP.
Cathodic protection (CP) is known as a reliable method to protect steel from corrosion. However, the influence of CP on biofilm formation and maturation is not well known. There are three possible effects of CP on biofilm formation and maturation. Those are: 1) deprivation of anchorage sites for bacterial adhesion, 2) increase of electrostatic repulsion between the steel surface and negatively charged bacteria, 3) elimination of bacteria in the biofilm by increasing pH. To investigate these possible effects of CP on biofilm, carbon steel coupons were immersed in artificial seawater with and without CP. CP retarded steel corrosion, as a consequence of inhibition of biofilm formation. CP also inhibited initial attachment of Pseudomonas aeruginosa PAO1, a strain well known for its negative charge and pioneering adhesive characteristics. Since the inhibitive effect of cell adhesion was greater in low ionic conditions than in high ionic conditions, CP increased electrical repulsion between the steel surface and bacteria. The increase of pH in an artificial biofilm composed of 0.5% agar and 0.9% NaCl was also investigated theoretically and experimentally. The pH profile in the artificial biofilm was analyzed using a capillary pH electrode. After three hours of CP, the biofilm pH increased and as a consequence sterilized P. aeruginosa PAO1 imbedded in the film. However, pH at the edge of the biofilm decreased sharply and reached the same value as that in the bulk-water. Therefore, bacteria located at the edge of the biofilm survived during the application of CP.
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