Anti-adhesion coating

Prevention of bacterial adhesion on surfaces via anti-adhesive coatings is one of the easiest, possibly cost-effective alternatives to ignore biofilm formation. Bacterial adhesion is a complex process which is influences by various factors involving — as stated above — the physical and chemical features of material surface, nevertheless also... 

Many examples have been reported on the biosurfactants potential as anti-adhesive coatings. The amount of biofilm formed by Salmonella typhimurium. Salmonella enterica, Escherichia coli and Proteus mirabilis in vinyl urethral catheters coated with surfactin was reduced as compared to the uncoated controls [124], Also, biosurfactants from probiotic lactobacilli successfully prevented the adhesion of uropatho-gens, and subsequent urogenital infections [19-21, 125], Biosurfactants from lactic acid bacteria (Streptococcus ther-mophilus A and Lactococcus lactis 53) were effectively used to avoid microbial colonization of silicone rubber voice prosthe-ses, thus their premature failure [26,27]. These bacterial [22] and Lactobacillus paracasei [126] biosurfactants were found to possess antimicrobial and anti-adhesive activity against... 

In addition to reducing urinary and stomach infections, cranberry juice has also been shovm to have anti-adhesive activity against oral bacteria, such as S. mutans (Guo et al, 1998 Weiss et al, 2002). In the latter study, the ability of saliva-coated S. mutans to adhere to saliva- or glucan-coated hydroxyapatite in the presence of 25% cranberry juice was greatly reduced by 40-85% as compared to the control, indicating that cranberry... 

Anti-adhesive effect. Green and roasted coffee, used in a treatment mixture and as a pretreatment on beads, inhibited the Strep tococcus mutans sucrose-independent adsorption to saliva-coated hydroxyapatite beads. The inhibition of Salmonelb mutans adsorption indicated that coffee-active molecules may adsorb to a host surface, preventing the tooth receptor from interacting with any bacterial adhesions. Among the known tested coffee components, trigonelline and nicotinic and chlorogenic acids are very... 

Removal of the article from the mold is lengthy process because anti-adhesive lubricants have to be sprayed on the on a mold surface before every injection, in an operation that takes up to 25 - 30% of the full cycle. In reactive molding of polyurethane-based compounds, internal lubricants are used in combination with surface coatings. This allows us to remove articles from a mold many times with a single coating treatment. One of the compounds used as an internal lubricant is silicon-organic liquids. 

Furfural-ketone copolymers have found commercial use, particularly in the Soviet Union, in applications ranging from floor coverings, anti-corrosion coatings, wood adhesives, and binders for carbon/graphite. When an alkaline catalyst is used, furfural is known to react with acetone to form the so-called furfurylidene acetone monomer, a mixture of 2-furfurylidene methylketone (6), bis(2-furfurylidene) ketone (7), mesityl oxide, and other oligomers. 

Coating of rebars. Proprietary products are often applied on the surface of the rebars, to promote adhesion to the repair mortar and to improve the corrosion resistance (often inhibiting properties are also claimed, anti-corrosion coatings ... 

Chem. Descrip. Organophilic molecular sieve (sodium aluminosilicate) CAS 1318-02-1 EINECS/ELINCS 215-283-8 Uses Polymer additive for adsorbing low m.w. organics such as aliphatics, alcohols, aldehydes, ketones, chlorinated hydrocarbons, org. acids, anti aromatics for use in adhesives, coatings, and polymers component of food pkg. materials... 

Uses Monomer, iatex prop, enhancer, stabiiizer, rheoiogy controi agent, adhesion promoter, anticoaguiant, anti-aggiomerantfor emuision poiy-merization, adhesives, coatings sodium sait as copoiymerizabie surfactant... 

Main fields of application cable wire, sheet, film, interior automotive, medical tubing, blood bags, gaskets, profiles, anti-fogging coatings, upholstery, artificial leather, adhesives, tapes ... 

Anti-adhesive agents have been sought to prevent the sticking of the bacteria to teeth but generally these have not been successful, and bacteriocides are normally used. The problem is the mechanism of the bacterial adhesion, as shown in Fig. 12.25. It is thought that a fdm of polymer from saliva first attaches to the hydroxyapatite. Then bacteria attach to this coating. The bacteria produce a complex layer of cell sheath which glues the cells to each other. 

---