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Home  > Raw materials & technologies  > Science today - coatings tomorrow  > Enzymes to replace biocides in antifouling...

Saturday, 26 September 2020
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Raw materials & technologies, Science today - coatings tomorrow

Enzymes to replace biocides in antifouling coatings

Thursday, 18 March 2010

Due to the persistent adverse environmental effects of conventionally used biocides, enzyme-based antifouling paints are proposed as a bio-based, non-accumulating alternative.

Enzymes are used for bio-based antifouling coatings Source: Slawomir Prycjp - Fotolia.com

Enzymes are used for bio-based antifouling coatings Source: Slawomir Prycjp - Fotolia.com

Current antifouling technologies for ship hulls are based on metals such as cuprous oxide and co-biocides like zinc pyrithione. Due to the persistent adverse environmental effects of these biocides, enzyme-based antifouling paints are proposed as a bio-based, non-accumulating alternative. Scientists tested a hydrogen peroxide-producing system composed of hexose oxidase, glucoamylase and starch for the chemical and physical functionalities necessary for successful incorporation into a marine coating. The activity and stability of the enzymes in seawater was evaluated at different temperatures, and paint compatibility was assessed by measuring the distribution and activity of the enzymes incorporated into prototype coating formulations. The scientists used a biomimetic encapsulation procedure for HOX through polyethylenimine-templated silica co-precipitation. Silica co-precipitation significantly improved the stability and performance of the antifouling system in marine-like conditions. The paper appeared in "Green Chemistry" (DOI: 10.1039/b913772f).

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