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Published on: October 10, 2016
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Constructing antibacterial polymer nanocapsules based on pyridine quaternary ammonium salt
Minghao Zeng1, Jiayun Xu1, Quan Luo1
1State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, PR China.
Summary
Novel pyridine quaternary ammonium salt polymer nanocapsules offer a new strategy against antibiotic resistance. These cationic nanocapsules effectively kill Gram-negative bacteria by disrupting their cell membranes.
Area of Science:
- Polymer Chemistry
- Materials Science
- Microbiology
Background:
- Antibiotic resistance is a global health crisis driven by excessive antibiotic use.
- Quaternary ammonium salt polymers show promise as antimicrobial agents to combat bacterial infections and resistance.
Purpose of the Study:
- To synthesize and characterize novel antimicrobial polymer nanocapsules based on pyridine quaternary ammonium salt.
- To investigate the mechanism of action of these nanocapsules against Gram-negative bacteria.
Main Methods:
- Synthesis of polymer nanocapsules from 2,4,6‑tris(4‑pyridyl)‑1,3,5‑triazine (TPT) and 1,2‑dibromoethane.
- Characterization using DLS, SEM, TEM, AFM, EDS, and EA.
- Determination of minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC).
Main Results:
- Successfully synthesized and characterized cationic hollow polymer nanocapsules.
- Demonstrated effective killing of Gram-negative Escherichia coli by disrupting cell membranes.
- Achieved MIC of 0.04 mg/mL and MBC of 0.1 mg/mL.
Conclusions:
- Pyridine quaternary ammonium salt polymer nanocapsules are effective antimicrobial agents.
- The mechanism involves adsorption of negatively charged bacterial phospholipids, leading to cell rupture.
- This approach offers a novel strategy to combat Gram-negative bacterial infections without membrane insertion.
