Assessing the Effects of Surface-Stabilized Zero-Valent Iron Nanoparticles on Diverse Bacteria Species Using...

Area of Science:

• Materials Science
• Nanotechnology
• Microbiology

Background:

• Nanoparticles offer customizable antimicrobial effects, termed the "designer effect", as alternatives to traditional agents.
• The antimicrobial properties of nanoparticle core-coating combinations, especially zero-valent iron nanoparticles (FeNPs), are understudied against diverse bacteria.

Purpose of the Study:

• To investigate the impact of surface-stabilized FeNPs with different coatings on six diverse bacterial species.
• To evaluate the feasibility of the "designer nanoparticle" concept for tailored antimicrobial applications.

Main Methods:

• Synthesized FeNPs coated with L-ascorbic acid (AA), cetyltrimethylammonium bromide (CTAB), or polyvinylpyrrolidone (PVP) using a bottom-up approach.
• Assessed antibacterial activity using the zone of inhibition (ZOI) via disc diffusion assay.
• Analyzed bacterial responses using ordinal regression and generalized linear mixed models.

Main Results:

• AA-FeNPs and CTAB-FeNPs demonstrated the most potent antibacterial activity.
• Bacterial sensitivity to FeNPs varied, with Bacillus nealsonii being most sensitive and Sphingobacterium multivorum least sensitive.
• Significant differences in bacterial responses to FeNP coatings and concentrations were statistically confirmed.

Conclusions:

• Surface-stabilized FeNPs with specific coatings can be designed for targeted antimicrobial effects.
• This study provides a framework for developing "designer nanoparticles" with tailored antibacterial properties.
• FeNPs show potential as effective antimicrobial agents, with coating playing a crucial role in efficacy.