title: Antifouling and Antibacterial Multifunctional Polyzwitterion/Enzyme Coating on Silicone Catheter Material Prepared by Electrostatic Layer-by-Layer Assembly.
abstract: The formation of bacterial biofilms on indwelling medical devices generally causes high risks for adverse complications such as catheter-associated urinary tract infections. In this work, a strategy for synthesizing innovative coatings of poly(dimethylsiloxane) (PDMS) catheter material, using layer-by-layer assembly with three novel functional polymeric building blocks, is reported, i.e., an antifouling copolymer with zwitterionic and quaternary ammonium side groups, a contact biocidal derivative of that polymer with octyl groups, and the antibacterial hydrogen peroxide (H2O2) producing enzyme cellobiose dehydrogenase (CDH). CDH oxidizes oligosaccharides by transferring electrons to oxygen, resulting in the production of H2O2. The design and synthesis of random copolymers which combine segments that have antifouling properties by zwitterionic groups and can be used for electrostatically driven layer-by-layer (LbL) assembly at the same time were based on the atom-transfer radical polymerization of dimethylaminoethyl methacrylate and subsequent partial sulfobetainization with 1,3-propane sultone followed by quaternization with methyl iodide only or octyl bromide and thereafter methyl iodide. The alternating multilayer systems were formed by consecutive adsorption of the novel polycations with up to 50% zwitterionic groups and of poly(styrenesulfonate) as the polyanion. Due to its negative charge, enzyme CDH was also firmly embedded as a polyanionic layer in the multilayer system. This LbL coating procedure was first performed on prefunctionalized silicon wafers and studied in detail with ellipsometry as well as contact angle (CA) and zetapotential (ZP) measurements before it was transferred to prefunctionalized PDMS and analyzed by CA and ZP measurements as well as atomic force microscopy. The coatings comprising six layers were stable and yielded a more neutral and hydrophilic surface than did PDMS, the polycation with 50% zwitterionic groups having the largest effect. Enzyme activity was found to be dependent on the depth of embedment in the multilayer coating. Depending on the used polymeric building block, up to a 60% reduction in the amount of adhering bacteria and clear evidence for killed bacteria due to the antimicrobial functionality of the coating could be confirmed. Overall, this work demonstrates the feasibility of an easy to perform and shape-independent method for preparing an antifouling and antimicrobial coating for the significant reduction of biofilm formation and thus reducing the risk of acquiring infections by using urinary catheters.
authors.affiliation: Lehrstuhl für Technische Chemie II, Universität Duisburg-Essen , 45117 Essen, Germany.
authors.forename: Anne
authors.initials: A
authors.lastname: Vaterrodt
authors.affiliation: Institute of Environmental Biotechnology, BOKU - University of Natural Resources and Life Sciences , 3430 Tulln, Austria.
authors.forename: Barbara
authors.initials: B
authors.lastname: Thallinger
authors.affiliation: Lehrstuhl für Technische Chemie II, Universität Duisburg-Essen , 45117 Essen, Germany.
authors.forename: Kevin
authors.initials: K
authors.lastname: Daumann
authors.affiliation: Lehrstuhl für Technische Chemie II, Universität Duisburg-Essen , 45117 Essen, Germany.
authors.forename: Dereck
authors.initials: D
authors.lastname: Koch
authors.affiliation: Institute of Environmental Biotechnology, BOKU - University of Natural Resources and Life Sciences , 3430 Tulln, Austria.|Austrian Centre of Industrial Biotechnology ACIB, Konrad Lorenz Strasse 20, 3430 Tulln, Austria.
authors.forename: Georg M
authors.initials: GM
authors.lastname: Guebitz
authors.affiliation: Lehrstuhl für Technische Chemie II, Universität Duisburg-Essen , 45117 Essen, Germany.
authors.forename: Mathias
authors.initials: M
authors.lastname: Ulbricht
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D001422:Bacterial Adhesion; D018441:Biofilms / Q000187:drug effects*; D002237:Carbohydrate Dehydrogenases / Q000737:chemistry / Q000378:metabolism; D004129:Dimethylpolysiloxanes / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D055664:Electrochemical Techniques; D005612:Freeze Drying; D006861:Hydrogen Peroxide / Q000378:metabolism; D008689:Methacrylates / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D009757:Nylons / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D056951:Photoelectron Spectroscopy; D011137:Polystyrenes / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D000644:Quaternary Ammonium Compounds / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D012825:Silicon; D019810:Sodium Azide; D013211:Staphylococcus aureus / Q000187:drug effects / Q000502:physiology; D062885:Urinary Catheters / Q000382:microbiology
chemical_list: D000900:Anti-Bacterial Agents; D004129:Dimethylpolysiloxanes; D008689:Methacrylates; D009757:Nylons; D011137:Polystyrenes; D000644:Quaternary Ammonium Compounds; C407037:poly(2-(dimethylamino)ethyl methacrylate); C521589:sulfobetaine methacrylate polymer; C013830:baysilon; C003321:polystyrene sulfonic acid; D019810:Sodium Azide; D006861:Hydrogen Peroxide; D002237:Carbohydrate Dehydrogenases; C019859:cellobiose-quinone oxidoreductase; D012825:Silicon