Antimicrobial activity of chemically modified dextran derivatives.

Area of Science:

• Polymer Chemistry
• Microbiology
• Materials Science

Background:

• Cationic polymers are explored for antimicrobial applications.
• Dextran derivatives offer a versatile platform for functionalization.

Purpose of the Study:

• Synthesize and characterize cationic amphiphilic dextran derivatives.
• Evaluate their antimicrobial properties against diverse microbial strains.
• Determine structure-activity relationships influencing antimicrobial efficacy.

Main Methods:

• Synthesis of dextran derivatives with varying alkyl chain lengths and quaternary ammonium groups.
• Antimicrobial activity assessment using disc-diffusion and broth microdilution methods.
• Analysis of minimum inhibitory concentrations (MICs) and inhibition zone diameters.

Main Results:

• Synthesized polymers exhibited antimicrobial activity against most tested bacteria and fungi, except Pseudomonas aeruginosa.
• Optimal activity against Staphylococcus aureus (MIC = 60 μg/mL) was observed with lower molecular mass dextran (Mn=4500), C12H25 or C18H37 end groups, and N,N-dimethyl-N-benzylammonium pendent groups.
• Antimicrobial efficacy was dependent on polymer composition and microbial species.

Conclusions:

• Cationic amphiphilic dextran derivatives represent a potential class of antimicrobial agents.
• Tailoring polymer structure, including molecular mass, end-group alkyl chain length, and quaternary ammonium group type, is crucial for optimizing antimicrobial activity.
• Further research is warranted to explore their therapeutic potential and mechanisms of action.