Antimicrobial activity of Fe-loaded chitosan nanoparticles

Area of Science:

• Biomaterials Science
• Nanotechnology
• Microbiology

Background:

• Chitosan is a biopolymer with inherent antimicrobial properties.
• Enhancing chitosan's antimicrobial efficacy is crucial for various applications.
• Iron ions can potentially modify chitosan's properties.

Purpose of the Study:

• To synthesize and characterize chitosan nanoparticles loaded with iron ions (Fe2+ or Fe3+).
• To evaluate the enhanced antimicrobial activity of these iron-loaded chitosan nanoparticles.
• To compare the efficacy of iron-loaded chitosan nanoparticles against chitosan alone.

Main Methods:

• Preparation of chitosan nanoparticles via surfactant-assisted chelation and ionic gelation.
• Characterization of nanoparticles using spectrophotometry for chelating rates, and size/zeta potential analysis.
• In vitro antimicrobial activity testing against Escherichia coli, Staphylococcus aureus, and Candida albicans.

Main Results:

• Chitosan nanoparticles loaded with Fe2+ and Fe3+ had mean diameters of 206.4 nm and 195.2 nm, respectively.
• Zeta potentials were +28.82 mV for Fe2+-loaded and +28.26 mV for Fe3+-loaded nanoparticles.
• Iron-loaded chitosan nanoparticles exhibited significantly higher antimicrobial activity at lower concentrations compared to plain chitosan.

Conclusions:

• Iron-loaded chitosan nanoparticles demonstrate superior antimicrobial properties.
• Fe2+-loaded chitosan nanoparticles showed a higher chelating rate than Fe3+-loaded ones.
• These findings suggest potential applications of iron-loaded chitosan nanoparticles in combating microbial infections.