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Anionic Chain-Growth Polymerization: Overview01:20

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Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...
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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Cationic Polymers Based on a Polyester Backbone Possessing Potent Antimicrobial Activity against Drug-Resistant

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Area of Science:

  • Polymer Chemistry
  • Antimicrobial Materials
  • Drug Discovery

Background:

  • Multidrug resistance (MDR) infections present a significant threat to public health, diminishing the effectiveness of conventional antibiotics.
  • Developing antimicrobial agents with potent efficacy, biocompatibility, and simplified structures is a critical unmet need.
  • Host defense peptides (HDPs) offer a template for novel antimicrobial strategies due to their broad-spectrum activity and unique mechanisms.

Purpose of the Study:

  • To design and synthesize a new class of cationic and amphiphilic polymers based on a simplified polyester backbone.
  • To evaluate the antibacterial activity, biofilm eradication potential, and biocompatibility of these novel polymer structures.
  • To explore the potential of these polymers as synthetic mimics of HDPs for combating MDR infections.

Main Methods:

  • Synthesis of cationic and amphiphilic Poly(ε-caprolactone) (PCL) derivatives.
  • Characterization of polymer structures and properties.
  • In vitro assessment of broad-spectrum antibacterial activity, including against MDR strains.
  • Evaluation of efficacy in eradicating mature bacterial biofilms.
  • In vivo safety studies in mice.

Main Results:

  • The optimal polymer, PKCL45, demonstrated broad-spectrum antibacterial activity at low concentrations (1 μg/mL).
  • PKCL45 effectively eradicated mature bacterial biofilms and exhibited insusceptibility to multidrug resistance.
  • In vivo studies in mice confirmed the systemic safety of the developed polymers.
  • The polyester backbone successfully mimicked the function of hydrophobic amino acids in HDPs, simplifying polymer design.

Conclusions:

  • Polyester-backbone antimicrobial polymers represent a promising new class of agents for combating bacterial infections, including MDR strains.
  • The simplified, cationic, and amphiphilic polymer design offers a viable strategy for developing effective and biocompatible antimicrobials.
  • These findings provide a novel approach for the clinical design of antimicrobial agents to address the challenge of antibiotic resistance.