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Mussel-Inspired Polymer-Based Coating Technology for Antifouling and Antibacterial Properties.

Adel S Imbia1, Artjima Ounkaew1, Xiaohui Mao1

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Summary

This study developed zwitterionic and cationic copolymers for antifouling coatings. Grafted onto polydopamine surfaces, these coatings show antibacterial and antifouling properties, enhancing biomedical device safety.

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Polymer Chemistry

Background:

  • Biofouling and bacterial adhesion are significant challenges for biomedical devices.
  • Traditional antifouling strategies often rely on toxic biocides, posing risks.
  • Zwitterionic and cationic polymers offer promising alternatives for non-toxic surface modification.

Purpose of the Study:

  • To develop a facile method for creating zwitterionic and cationic copolymer coatings.
  • To graft these copolymers onto polydopamine-coated surfaces for enhanced antifouling and antibacterial properties.
  • To evaluate the efficacy and biocompatibility of the modified surfaces.

Main Methods:

  • Utilized reversible addition-fragmentation chain transfer (RAFT) polymerization to synthesize zwitterionic (MPC) and cationic (META) copolymers with 4-formyl phenyl methacrylate (FPMA).
  • Covalently grafted the synthesized copolymers (MPF and MTF) onto amine groups of polydopamine (PDA)-coated surfaces.
  • Assessed antibacterial activity against *S. aureus* and *E. coli*, antifouling performance against bovine serum albumin, and cell viability of MRC-5 cells.

Main Results:

  • PDA/MPF/MTF-coated surfaces demonstrated significant antibacterial efficacy against both Gram-positive (*S. aureus*) and Gram-negative (*E. coli*) bacteria.
  • The modified surfaces exhibited excellent antifouling properties, effectively preventing protein adhesion.
  • Coated surfaces maintained high viability of normal human lung fibroblast cells (MRC-5), indicating good biocompatibility.

Conclusions:

  • The facile surface modification strategy using zwitterionic and cationic copolymers provides effective antibacterial and antifouling properties.
  • This approach avoids toxic biocides, making it highly suitable for biomedical device applications.
  • The developed coatings show potential for broad applicability in medical device manufacturing.