Silver/poly (lactic acid) nanocomposites: preparation, characterization, and antibacterial activity

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Biodegradable polymers like poly (lactic acid) (PLA) are crucial for medical applications.
• Incorporating antimicrobial agents into polymer matrices can enhance their utility.
• Silver nanoparticles (Ag-NPs) are known for their broad-spectrum antibacterial activity.

Purpose of the Study:

• To synthesize and characterize silver/poly (lactic acid) nanocomposite (Ag/PLA-NC) films.
• To investigate the antibacterial properties of Ag/PLA-NC films with varying Ag-NP concentrations.
• To evaluate the potential of Ag/PLA-NC films as antibacterial scaffolds for tissue engineering and medical use.

Main Methods:

• Ag-NPs were synthesized within a PLA matrix using a chemical reduction method.
• Ag/PLA-NC films were prepared with different Ag-NP weight percentages (8, 16, 32 wt%).
• Morphology, Ag-NP distribution, silver ion release, and antibacterial activity (against E. coli, V. parahaemolyticus, S. aureus) were characterized.

Main Results:

• The synthesis successfully incorporated Ag-NPs into the PLA matrix.
• Characterization confirmed the presence and distribution of Ag-NPs within the films.
• Ag/PLA-NC films demonstrated significant antibacterial activity, which increased with higher Ag-NP content.

Conclusions:

• Ag/PLA-NC films exhibit concentration-dependent antibacterial efficacy.
• The developed nanocomposite films show promise as antibacterial scaffolds.
• These materials are suitable for tissue engineering and various medical applications requiring antimicrobial properties.