Ennoblement of stainless steel in the presence of glucose oxidase: Nature and role of interfacial processes

Rainbow fringes around crevice corrosion formed on stainless steel AISI 316 after ennoblement in seawater

“…From potential evolution [19] we can conclude that the stainless steel passivity increases after H 2 O 2 addition. As the latest published literature, H 2 O 2 can also make the composition changes on stainless steel AISI 316 surface [20]. We believe that the surface variation after H 2 O 2 addition induces small crevices at stainless steel AISI 316-epoxy resin interface in this test.…”

Catalysis of the electrochemical reduction of oxygen by bacteria isolated from electro-active biofilms formed in seawater

“…The catalysis by marine biofilms of oxygen reduction on metallic materials has long been known in the field of microbial corrosion (Scotto et al, 1985;Mollica et al, 1997) but the mechanism has not been clearly elucidated. Different hypotheses have been evoked (see Landoulsi et al, 2008 for a review). They include production of hydrogen peroxide in the biofilm (Dupont et al, 1998;L'Hostis et al, 2003) or involvement of extracellular compounds and enzymes (Scotto and Lai, 1998;Lai and Bergel, 2000).…”

Silanization with APTES for Controlling the Interactions Between Stainless Steel and Biocomponents: Reality vs Expectation

“…Rouxhet & Genet, 2011). In previous studies (Landoulsi et al, 2008a;Landoulsi et al, 2008b), we have demonstrated the usefulness of this approach, even when the evolution of the C 1s and O 1s peak shape is weak, in order to obtain information on the amount and the nature of organic and inorganic constituents on SS surfaces. Fig.…”

“…The meaning of the surface composition appears more clearly if it is summarized in terms of concentration of model molecular compounds. This approach was already used for microbial surfaces (Dufrêne & Rouxhet, 1996;Tesson et al, 2009), for food products and for stainless steel aged in different conditions (Landoulsi et al, 2008b), considering proteins (Pr), polysaccharides (PS), and hydrocarbon-like compounds (HC) which represent mainly lipids in biological systems. The novelty here is to take silane (Sl) into account in addition to the three classes of biochemical compounds; the chemical composition and density considered for these model compounds are listed in Table 3.…”

“…The present work is dedicated to the surface composition of 316L SS surfaces at different stages of the procedure used to graft a protein via the use of APTES and of a bifunctional agent expected to link the NH 2 -terminated silane with NH 2 groups of the protein. Glucose oxidase was chosen as a model protein for reasons of convenience owing to previous works related to microbiologically influenced corrosion (Dupont et al, 1998, Landoulsi et al, 2009, Landoulsi et al, 2008b, Landoulsi et al, 2008c. A particular attention is given to (i) the real state of the interface (composition, depth distribution of constituents) at different stages and (ii) the mode of protein retention.…”