skip to content
Dovepress - Open Access to Scientific and Medical Research
View our mobile site

8852

Visualization of interaction between inorganic nanoparticles and bacteria or fungi

Original Research

(2451) Views  (1470) Full article downloads

Authors: André Chwalibog, Ewa Sawosz, Anna Hotowy, et al

Published Date December 2010 Volume 2010:5 Pages 1085 - 1094
DOI: http://dx.doi.org/10.2147/IJN.S13532

André Chwalibog1, Ewa Sawosz2, Anna Hotowy1, Jacek Szeliga2, Stanislaw Mitura3, Katarzyna Mitura3, Marta Grodzik2, Piotr Orlowski2, Aleksandra Sokolowska4
1University of Copenhagen, Copenhagen, Denmark; 2Warsaw University of Life Sciences, Warsaw, Poland; 3Technical University of Lódz, Lódz, Poland; 4Warsaw University of Technology, Warsaw, Poland

Purpose: The objective of the present investigation was to evaluate the morphologic characteristics of self-assemblies of diamond (nano-D), silver (nano-Ag), gold (nano-Au), and platinum (nano-Pt) nanoparticles with Staphylococcus aureus (bacteria) and Candida albicans (fungi), to determine the possibility of constructing microorganism–nanoparticle vehicles.
Methods: Hydrocolloids of individual nanoparticles were added to suspensions of S. aureus and C. albicans. Immediately after mixing, the samples were inspected by transmission electron microscopy.
Results: Visualization of the morphologic interaction between the nanoparticles and microorganisms showed that nano-D, which are dielectrics and exhibit a positive zeta potential, were very different from the membrane potentials of microorganisms, and uniformly surrounded the microorganisms, without causing visible damage and destruction of cells. All metal nanoparticles with negative zeta potential had cell damaging properties. Nano-Ag showed the properties of self-organization with the cells, disintegrating the cell walls and cytoplasmic membranes, and releasing a substance (probably cytoplasm) outside the cell. Arrangement of nano-Au with microorganisms did not create a system of self-organization, but instead a "noncontact" interaction between the nanoparticles and microorganisms was observed to cause damage to fungal cells. Nano-Pt caused both microorganisms to release a substance outside the cell and disintegrated the cytoplasmic membrane and cell wall.
Conclusion: Nano-Ag, nano-Au, and nano-Pt (all metal nanoparticles) are harmful to bacteria and fungi. In contrast, nano-D bind closely to the surface of microorganisms without causing visible damage to cells, and demonstrating good self-assembling ability. The results indicate that both microorganisms could be used as potential carriers for nano-D.

Keywords: nanoparticles, diamond, silver, gold, platinum, Staphylococcus aureus, Candida albicans, morphology




 

Other articles by Professor André Chwalibog



Readers of this article also read:

Bactericidal effects of silver plus titanium dioxide-coated endotracheal tubes on Pseudomonas aeruginosa and Staphylococcus aureus
Deposition of silver nanoparticles on titanium surface for antibacterial effect
Bactericidal effect of iron oxide nanoparticles on Staphylococcus aureus
Antibacterial titanium plate deposited by silver nanoparticles exhibits cell compatibility
Toxic effects of iron oxide nanoparticles on human umbilical vein endothelial cells
Green synthesis of silver/montmorillonite/chitosan bionanocomposites using the UV irradiation method and evaluation of antibacterial activity
Synthesis and characterization of silver/montmorillonite/chitosan bionanocomposites by chemical reduction method and their antibacterial activity
Nanotoxicology and nanoparticle safety in biomedical designs
Reducing infections through nanotechnology and nanoparticles
Efficacy and safety of nanohybrids comprising silver nanoparticles and silicate clay for controlling Salmonella infection