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Size-, composition- and shape-dependent toxicological impact of metal oxide nanoparticles and carbon nanotubes toward bacteria.
- Source :
-
Environmental science & technology [Environ Sci Technol] 2009 Nov 01; Vol. 43 (21), pp. 8423-9. - Publication Year :
- 2009
-
Abstract
- Ecotoxicological effects of nanoparticles (NP) are still poorly documented while their commercialization for industrial and household applications increases. The aim of this study was to evaluate the influence of physicochemical characteristics on metal oxide NP and carbon nanotubes toxicological effects toward bacteria. Two strains of bacteria, Cupriavidus metallidurans CH34 and Escherichia coli MG1655 were exposed to TiO(2) or Al(2)O(3) NP or to multiwalled-carbon nanotubes (MWCNT). Particular attention was paid on optimizing NP dispersion to obtain nonagglomerated suspensions. Our results show that NP toxicity depends on their chemical composition, size, surface charge, and shape but not on their crystalline phase. MWCNT toxicity does not depend on their purity. Toxicity also depends on the bacterial strain: E. coli MG1655 is sensitive to NP, whereas C. metallidurans CH34 is not. Interestingly, NP are accumulated in both bacterial strains, and association between NP and bacteria is necessary for bacterial death to occur. NP may then represent a danger for the environment, causing the disappearance of some sensitive bacterial strains such as E. coli MG1655, but also being mobilized by nonsensitive strains such as C. metallidurans CH34 and transported through the whole ecosystem.
- Subjects :
- Bacteria cytology
Bacteria ultrastructure
Culture Media
Environmental Exposure analysis
Intracellular Space drug effects
Intracellular Space metabolism
Metal Nanoparticles microbiology
Metal Nanoparticles ultrastructure
Microbial Viability drug effects
Nanotubes, Carbon microbiology
Oxides chemistry
Reactive Oxygen Species metabolism
Bacteria drug effects
Metal Nanoparticles chemistry
Metal Nanoparticles toxicity
Nanotubes, Carbon chemistry
Nanotubes, Carbon toxicity
Oxides toxicity
Particle Size
Subjects
Details
- Language :
- English
- ISSN :
- 0013-936X
- Volume :
- 43
- Issue :
- 21
- Database :
- MEDLINE
- Journal :
- Environmental science & technology
- Publication Type :
- Academic Journal
- Accession number :
- 19924979
- Full Text :
- https://doi.org/10.1021/es9016975