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Evaluation of Antimicrobial Activities of Nanoparticles and Nanostructured Surfaces In Vitro
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Gold Nanoparticles: An Efficient Antimicrobial Agent against Enteric Bacterial Human Pathogen.

Shahzadi Shamaila1, Noshin Zafar2, Saira Riaz3

  • 1Department of Physics, University of Engineering & Technology, Lahore 54890, Pakistan. drshamaila.uet@gmail.com.

Nanomaterials (Basel, Switzerland)
|March 25, 2017
PubMed
Summary

Gold nanoparticles show antibacterial activity against common enteric pathogens like Escherichia coli and Staphylococcus aureus. Their effectiveness depends on particle size and dosage, offering a potential alternative to traditional antibiotics.

Keywords:
chemical reduction methodenteric bacterial human pathogensgold nanoparticlesgram-negative and gram-positive bacteria

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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.