Silver Nanoparticles Stabilized Using Chitosan Films: Preparation, Properties and Antibacterial Activity

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Chitosan films are biocompatible and biodegradable.
• Silver nanoparticles exhibit potent antimicrobial properties.
• Developing safe and effective methods for nanoparticle integration into biomaterials is crucial.

Purpose of the Study:

• To synthesize silver nanoparticles (AgNPs) coated with chitosan films using a simple, environmentally friendly method.
• To characterize the AgNPs within the chitosan matrix.
• To evaluate the antibacterial efficacy of the resulting composite films.

Main Methods:

• Silver nanoparticles synthesized via chitosan-mediated reduction of silver nitrate.
• Characterization using X-ray diffraction spectroscopy (XRD), X-ray photoelectron spectroscopy (XPS), UV-Vis spectroscopy, transmission electron microscopy (TEM), and atomic absorption spectroscopy (AAS).
• Antibacterial activity assessed using the disc diffusion method against Staphylococcus epidermidis and Escherichia coli.

Main Results:

• Successful synthesis of AgNPs stabilized by chitosan without harmful reducing agents.
• Confirmation of AgNP presence in solid films and solutions via multiple spectroscopic and microscopic techniques.
• Demonstrated significant antibacterial activity of the AgNP-chitosan films against both Gram-positive and Gram-negative bacteria.

Conclusions:

• The developed AgNP-chitosan films are effectively synthesized and characterized.
• The films possess potent broad-spectrum antibacterial activity.
• These materials show promise for applications in wound dressings, antimicrobial packaging, and nanoparticle storage.