Gold Nanoparticles: An Efficient Antimicrobial Agent against Enteric Bacterial Human Pathogen

Area of Science:

• Nanotechnology
• Microbiology
• Materials Science

Background:

• Enteric bacterial pathogens such as Escherichia coli and Staphylococcus aureus are significant causes of diarrheal diseases.
• The emergence of antibiotic resistance necessitates the exploration of novel antibacterial agents.
• Gold nanoparticles (AuNPs) are being investigated for their potential therapeutic applications.

Purpose of the Study:

• To investigate the antibacterial effects of chemically synthesized gold nanoparticles on human enteric pathogens.
• To determine the influence of gold nanoparticle size and concentration on antibacterial efficacy.
• To elucidate the mechanism by which gold nanoparticles affect bacterial cell structure.

Main Methods:

• Chemical synthesis of gold nanoparticles.
• Characterization of gold nanoparticles using UV-Vis spectroscopy, Atomic Force Microscopy (AFM), and X-ray Diffractometry (XRD).
• Evaluation of antibacterial activity against Gram-negative (Escherichia coli, Klebsiella pneumoniae) and Gram-positive (Staphylococcus aureus, Bacillus subtilis) bacteria.

Main Results:

• Gold nanoparticles synthesized had a mean particle size ranging from 6-40 nm.
• Antibacterial activity was found to be dose-dependent.
• Gold nanoparticles demonstrated the ability to lyse both Gram-negative and Gram-positive bacteria.

Conclusions:

• Chemically synthesized gold nanoparticles exhibit significant antibacterial properties against key enteric pathogens.
• The antibacterial efficacy of gold nanoparticles is influenced by particle size and applied dose.
• Gold nanoparticles represent a promising alternative to conventional antibiotics for treating bacterial infections.