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Graft copolymers of 2-(methacryloyloxy)ethyl phosphorylcholine (MPC) and 2-hydroxypropyl methacrylate (HPMA) show significant antimicrobial activity against Staphylococcus aureus. This activity is attributed to the hydrophobic side chains rupturing bacterial membranes.

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Area of Science:

  • Polymer Chemistry
  • Biomaterials Science
  • Microbiology

Background:

  • Rising global microbial resistance necessitates novel antimicrobial agents.
  • Copolymer architecture and composition are key to understanding antimicrobial mechanisms.
  • 2-(methacryloyloxy)ethyl phosphorylcholine (MPC) and 2-hydroxypropyl methacrylate (HPMA) are promising building blocks for functional copolymers.

Purpose of the Study:

  • To investigate the structure-activity relationship of MPC-HPMA copolymers against Staphylococcus aureus.
  • To elucidate the mechanism of action for antimicrobial copolymer activity.
  • To compare the antimicrobial efficacy of block vs. graft copolymer architectures.

Main Methods:

  • Synthesis of block and graft copolymers using atom transfer radical polymerization and reversible addition-fragmentation chain transfer polymerization.
  • Characterization using (1)H NMR, gel permeation chromatography, rheology, and surface tensiometry.
  • Antimicrobial assessment via direct contact assays, live/dead staining, lactate dehydrogenase (LDH) release, and transmission electron microscopy (TEM).

Main Results:

  • Poly(MPC) homopolymer was biocompatible but lacked antimicrobial activity.
  • PMPC-g-PHPMA graft copolymers demonstrated significant reduction in bacterial growth and viability.
  • PMPC-PHPMA diblock copolymers showed no antimicrobial activity but formed biocompatible gels.
  • LDH assays and surface tensiometry indicated surfactant-like activity for graft copolymers.

Conclusions:

  • The antimicrobial efficacy of MPC-HPMA copolymers is dependent on their architecture, with graft copolymers showing superior activity.
  • The mechanism of action involves the hydrophobic PHPMA side chains disrupting the bacterial membrane.
  • These findings provide insights into designing effective antimicrobial copolymers for combating microbial resistance.