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Antibacterial Amino Acid-Based Poly(ionic liquid) Membranes: Effects of Chirality, Chemical Bonding Type, and

Jiangna Guo1, Yuanmei Qian1, Bin Sun2

  • 1Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.

ACS Applied Bio Materials
|January 13, 2022
PubMed

Insights

Chiral amino acid-based polymers show enhanced antibacterial activity against MRSA. Ionic bonding and D-enantiomers improve effectiveness, promoting wound healing and reducing inflammation in infected models.

Area of Science:

  • Materials Science
  • Biotechnology
  • Polymer Chemistry

Background:

  • Bacterial infections, particularly those caused by antibiotic-resistant strains like methicillin-resistant Staphylococcus aureus (MRSA), pose significant health risks.
  • Antibacterial polymeric materials offer a strategy to combat microbial drug resistance by disrupting bacterial cell membranes or interfering with essential cellular processes.
  • Developing novel antibacterial materials is crucial for effective infection control and treatment.

Purpose of the Study:

  • To synthesize and evaluate amino acid-based ionic liquids (ILs) and poly(ionic liquid) (PIL) membranes as antibacterial agents for treating MRSA-infected skin wounds.
  • To investigate the influence of chirality (D- vs. L-enantiomers) and chemical bonding (ionic vs. covalent) of amino acid groups on the antibacterial properties of ILs and PILs.
  • To assess the efficacy of these materials in promoting wound healing and reducing systemic infection in a mouse model.

Main Methods:

  • Synthesis of amino acid-based ionic liquids and poly(ionic liquid) membranes with varying chirality and bonding types.
  • In vitro assessment of antibacterial activity against methicillin-resistant Staphylococcus aureus (MRSA).
  • In vivo evaluation of wound healing, inflammation reduction, and systemic effects in MRSA-infected mouse models.

Main Results:

  • PIL membranes with D-enantiomeric amino acid groups demonstrated superior antibacterial activity compared to those with L-enantiomers.
  • Ionically-bonded PIL membranes exhibited higher antibacterial efficacy than covalently-bonded polymeric membranes.
  • Amino acid-based PIL membranes significantly accelerated wound healing, reduced local inflammation, and protected vital organs from MRSA infection in vivo.

Conclusions:

  • Chirality and chemical bonding of amino acid groups critically influence the antimicrobial activity of PIL membranes.
  • Amino acid-based PIL membranes show significant potential as effective antimicrobial wound dressings for treating MRSA-infected skin injuries.
  • These findings highlight the development of advanced antibacterial materials for addressing the challenge of antimicrobial resistance.
Keywords:
antibacterialchiralitycovalently-bondedionically-bondedmouse modelpoly(ionic liquid) membranes

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