Noncytotoxic silver nanoparticles as a new antimicrobial strategy

Area of Science:

• Biotechnology
• Materials Science
• Nanomedicine

Background:

• Bacterial drug resistance and biofilm formation pose significant challenges in healthcare.
• Current antibacterial treatments face limitations like degradation and instability.

Purpose of the Study:

• To develop an eco-friendly synthesis of silver nanoparticles (AgNPs) using yeast.
• To evaluate the antibacterial, antifungal, and anti-biofilm properties of these AgNPs.
• To assess the cytotoxic effects and potential applications of AgNPs in root canal treatment.

Main Methods:

• Extracellular synthesis of AgNPs using Saccharomyces cerevisiae.
• Characterization using Transmission Electron Microscopy (TEM), Dynamic Light Scattering (DLS), and Energy Dispersive X-ray Spectroscopy (EDS).
• Antimicrobial, anti-biofilm, and cytotoxicity assays on various cell lines; Scanning Electron Microscopy (SEM) for root canal penetration.

Main Results:

• Yeast-based synthesis yielded stable, uniformly distributed AgNPs with sulfur-rich capping agents.
• AgNPs demonstrated significant inhibition of bacterial growth and eradication of biofilms, with no impact on fungal growth.
• Cytotoxicity assays showed minimal impact on mammalian cells, and SEM confirmed deep penetration into root canals.

Conclusions:

• Yeast-synthesized AgNPs are effective against bacteria and biofilms, offering a stable and potentially non-toxic alternative to conventional treatments.
• AgNPs show promise as a novel therapeutic agent for drug-resistant bacterial infections and as a material for root-end filling.