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Lipoic Acid Based Redox-Responsive Degradable Antimicrobial Polymers.

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New antimicrobial polymers combat drug-resistant bacteria. These disulfide-based polymers show promise against infections, offering a degradable alternative to traditional antibiotics.

Keywords:
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Area of Science:

  • Polymer Chemistry
  • Antimicrobial Materials
  • Drug Delivery

Background:

  • Multidrug-resistant (MDR) pathogens present a significant global health challenge.
  • Antimicrobial peptides (AMPs) show promise but face limitations like degradation and cost.
  • Antimicrobial polymers (APs) offer an alternative, inspired by AMPs and synthesized using controlled polymerization.

Purpose of the Study:

  • To synthesize novel, degradable, disulfide-containing antimicrobial polymers.
  • To incorporate benzyl lipoate, a lipoic acid derivative, for hydrophobic properties.
  • To evaluate the antimicrobial activity, hemocompatibility, and degradability of the synthesized polymers.

Main Methods:

  • Reversible addition-fragmentation chain transfer (RAFT) polymerization was employed.
  • Benzyl lipoate was synthesized and copolymerized with cationic and hydrophilic monomers (HEAm, PEGMEA).
  • Antimicrobial activity against *Pseudomonas aeruginosa*, hemocompatibility, and redox-responsive degradability were assessed.

Main Results:

  • The synthesized polymers exhibited antimicrobial activity against drug-resistant *Pseudomonas aeruginosa*.
  • Improved hemocompatibility was observed compared to existing antimicrobial agents.
  • The polymers demonstrated controlled, redox-responsive degradability.

Conclusions:

  • Disulfide-based antimicrobial polymers offer a promising strategy against MDR infections.
  • The developed polymers show potential for clinical translation due to their efficacy and safety profile.
  • Controlled degradability is a key feature for next-generation antimicrobial strategies.