title: Siloxane-based biocatalytic films and paints for use as reactive coatings.
abstract: We have developed a new methodology for preparing films and paints suitable for use as biocatalytic coatings. The hydrolytic enzymes pronase and alpha-chymotrypsin were immobilized by either sol-gel entrapment or by covalent attachment into a polydimethylsiloxane (PDMS) matrix and cast into thin films or incorporated into an oil-based paint formulation. All of the coatings retained enzymatic activity and adhered to several different materials. The enzymatic films and paints also exhibited higher thermostability than enzyme free in solution or covalently attached to the outer surface of PDMS. A porous membrane based on a PDMS-immobilized enzyme was also prepared by an immersion precipitation process. Protein adsorption measurements showed that the enzyme-containing films and paints adsorbed less protein than enzyme-free controls, and that protein adsorption decreased with increasing proteolytic activity of the coating. These coatings thus provide the means to apply a stable enzymatic surface to a wide range of materials, and may be generally useful as biocatalytic paints and films.
authors.affiliation: Department of Chemical Engineering, University of California, Berkeley, California 94720, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Kim
authors.forename: J
authors.initials: J
authors.lastname: Dordick
authors.forename: D
authors.initials: D
authors.lastname: Clark
mesh_terms: D000327:Adsorption; D018441:Biofilms / Q000187:drug effects; D002384:Catalysis; D002918:Chymotrypsin / Q000737:chemistry* / Q000494:pharmacology; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D004800:Enzymes, Immobilized / Q000737:chemistry* / Q000494:pharmacology; D005782:Gels; D006358:Hot Temperature; D008422:Materials Testing; D010150:Paint; D011402:Pronase / Q000737:chemistry* / Q000378:metabolism; D012828:Silicones / Q000737:chemistry*; D012996:Solutions; D013499:Surface Properties
chemical_list: D020099:Coated Materials, Biocompatible; D004129:Dimethylpolysiloxanes; D004800:Enzymes, Immobilized; D005782:Gels; D012828:Silicones; D012996:Solutions; C013830:baysilon; D002918:Chymotrypsin; C117608:alpha-chymotrypsin; D011402:Pronase