New kind of bio-based antifouling coating

Researchers describe the fabrication of an antifouling coating based on chitosan-melanin hybrid nanoparticles as sustainable and antimicrobial surface.

A squid in the ocean.
Melanin nanoparticles were isolated from sepia ink.  Image source: joakant - Pixabay (symbol image).

Researchers have developed a very effective, completely biocompatible, cost-effective and ecofriendly method for antifouling purposes. Melanin nanoparticles and chitosan nanoparticles were isolated from sepia ink (Sepia Pharaonis) and Penaeus merguiensis and a chitosan-melanin hybrid nanoparticles complex was synthesised. The result of FTIR showed that a new band between chitosan and melanin nanoparticles was in the absorption range of 1633 cm−1.

Effective results

The MIC of chitosan-melanin hybrid nanoparticles was observed against E. coli (1.56 μg/mL) and S. aureus (0.871 μg/mL). The field immersion was evaluated in natural seawater, in different concentration (3, 2, 1 and 0.5 % wt) of chitosan-melanin hybrid nanoparticles, for 3 month. The most successful and effective results were observed for the panel with 3 wt% chitosan-melanin hybrid nanoparticles, which had lowest weight (28 g) of biofouling.

The study has been published in Progress in Organic Coatings, Volume 174, January 2023.

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