Antimicrobial Property of Halogenated Catechols

Area of Science:

• Biomaterials Science
• Antimicrobial Agents
• Polymer Chemistry

Background:

• Multidrug-resistant (MDR) bacterial infections pose a significant global health threat.
• Catechol moieties are known for their adhesive properties but their intrinsic antimicrobial activity is unexplored.
• Developing novel materials to combat MDR bacteria is crucial.

Purpose of the Study:

• To synthesize and evaluate halogenated dopamine methacrylamide (DMA) monomers for antimicrobial activity.
• To investigate the incorporation of these monomers into hydrogels, copolymers, and coatings.
• To explore the mechanism of antimicrobial action and potential applications.

Main Methods:

• Synthesis of chloro-, bromo-, and iodo-functionalized DMA monomers.
• Incorporation of DMA monomers into hydrogels, copolymers, and coatings.
• Antimicrobial efficacy testing against Gram-positive and Gram-negative bacteria, including MDR strains.
• Biofilm inhibition assays and cytotoxicity assessments.
• Molecular docking and dynamics simulations to predict mechanism of action.

Main Results:

• Halogenated DMA monomers demonstrated >99% killing efficiency against Staphylococcus aureus and Escherichia coli.
• Hydrogels with chlorinated DMA showed broad-spectrum activity against multiple MDR bacteria (MRSA, VRE, PAER, AB, CRKP).
• Antimicrobial hydrogels effectively killed bacteria in biofilms with low cytotoxicity.
• Molecular simulations suggest inhibition of bacterial fatty acid synthesis via the FabI enzyme.

Conclusions:

• Halogenated DMA monomers possess intrinsic antimicrobial properties, particularly the chlorinated variant.
• These monomers can be incorporated into various polymeric materials to create effective antimicrobial bioadhesives and coatings.
• The developed materials offer a promising strategy for combating MDR bacterial infections and biofilms.