Non-toxic O-quaternized chitosan materials with better water solubility and antimicrobial function

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Antimicrobial Agents

Background:

• Chitosan is a biocompatible polysaccharide with inherent antimicrobial properties.
• Modifications are needed to enhance chitosan's water solubility and efficacy.
• Quaternary ammonium salts (QAS) are known for potent antimicrobial activity.

Purpose of the Study:

• To synthesize and characterize novel water-soluble O-quaternary ammonium salt-chitosans (QAS-CS).
• To evaluate the antibacterial efficacy and cytotoxicity of the synthesized QAS-CS.
• To explore their potential as advanced wound care materials.

Main Methods:

• Synthesis of five different QAS-CS derivatives via chemical modification.
• Characterization using FTIR, 1H NMR, and elemental analysis.
• Assessment of antibacterial activity against Gram-positive and Gram-negative bacteria.
• Cytotoxicity evaluation using AT2 cell line and CCK-8 assay.

Main Results:

• All synthesized QAS-CS exhibited significantly improved water solubility compared to unmodified chitosan.
• QAS-CS demonstrated good antibacterial activity against Gram-positive bacteria, with C12QAS-CS and C14QAS-CS being most effective.
• Cytotoxicity of QAS-CS was substantially lower than their corresponding QAS monomers.
• Antibacterial efficacy against Gram-negative bacteria was limited.

Conclusions:

• The developed QAS-CS materials offer a promising strategy for creating effective antibacterial agents.
• Enhanced water solubility and reduced cytotoxicity make these QAS-CS suitable for biomedical applications.
• Further research could focus on optimizing activity against Gram-negative bacteria for broader applications.