Accession Number:

ADA621076

Title:

Antimicrobial Effects of Gold/Copper Sulphide (Au/Cus) Core/Shell Nanoparticles on Bacillus Anthracis Spores and Cells

Descriptive Note:

Master's thesis

Corporate Author:

NORTH CAROLINA CENTRAL UNIV DURHAM

Personal Author(s):

Report Date:

2013-01-01

Pagination or Media Count:

62.0

Abstract:

Bacillus anthracis is a gram positive, rod shaped and spore forming bacteria. It causes anthrax, a deadly human and animal disease that can kill its victims in three days. The spores of B. antrhacis can survive extreme environmental conditions for decades and germinate when exposed to proper conditions. Due to its potential as a bio-weapon, effective disinfectants that pose less harm to the environment and animals are urgently needed. Metal nanoparticles have the potential of killing microbial cells and spores. We present here the effect of GoldCopper Sulphide coreshell AuCuS nanoparticles on B. anthracis cells and spores. The results indicated that the continuous presence of 0.83 micrometers during the spore growth in nutrient medium completely inhibited spore outgrowth. AuCuS nanoparticles at concentration of 4.15 micrometers completely inactivated B. anthracis cells x 10exp7 after 30 min of pre-treatment in any of the three buffers including water, PBS, and nutrient broth. However, the same and even higher concentrations of nanoparticles produce no significant spore x 10exp5 killing after 24 h of pre-treatment. SEM imaging, EDS analysis, and DNA extrusion experiments revealed that nanoparticles damaged the cell membrane causing DNA and cytosolic content efflux and eventually cell death. The study demonstrated the strong antimicrobial activity of AuCuS nanoparticles to B. anthracis cells and revealed that AuCuS NPs showed more effective inactivation effect against the cells than they did against the spores.

Subject Categories:

  • Microbiology
  • Pharmacology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE