Multi-walled carbon nanotubes, natural organic matter, and the benthic diatom Nitzschia palea: "A sticky story"

Abstract Different effects of multi-walled carbon nanotubes (MWCNTs) on the freshwater diatom Nitzschia palea were examined. MWCNTs used in this study (MWCNT) were dispersed either by sonication without (MWCNTsonicated) or with a realistic concentration (10 mg L−1) of Natural Organic Matter (MWCNT+N...

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Bibliographic Details
Published in:Nanotoxicology 2015-03, Vol.9 (2), p.219-229
Main Authors: Verneuil, Laurent, Silvestre, Jérôme, Mouchet, Florence, Flahaut, Emmanuel, Boutonnet, Jean-Charles, Bourdiol, Floriane, Bortolamiol, Tifania, Baqué, David, Gauthier, Laury, Pinelli, Eric
Format: Article
Language:English
Subjects:
Affinity
Algae
Bacillariophyceae
Biochemistry
Biochemistry, Molecular Biology
Biopolymers - biosynthesis
Carbohydrates
Cell Survival - drug effects
Cell Survival - physiology
Chemical Sciences
Devices
Diatoms - drug effects
Diatoms - physiology
Ecotoxicology
Exposure
extracellular polymeric substances
Life Sciences
Markers
Material chemistry
Multi wall carbon nanotubes
nano-ecotoxicology
nanoparticles
Nanotubes, Carbon - toxicity
Nitzschia palea
Palea
Photosynthesis - drug effects
Photosynthesis - physiology
Shading
Sound filters
toxicity
Toxicity Tests - methods
Toxicology
Water Pollutants - toxicity
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Summary:Abstract Different effects of multi-walled carbon nanotubes (MWCNTs) on the freshwater diatom Nitzschia palea were examined. MWCNTs used in this study (MWCNT) were dispersed either by sonication without (MWCNTsonicated) or with a realistic concentration (10 mg L−1) of Natural Organic Matter (MWCNT+NOM). A pocket-size device was designed to distinguish shading effect (using MWCNT suspensions as external filters) from total exposure effect of MWCNTsonicated and MWCNT+NOM on benthic algae. This study demonstrates that cell division was strongly inhibited after a 48 h exposure to MWCNT+NOM compared to MWCNTsonicated. This device did not yield a quantifiable contribution of shading to growth inhibition of MWCNTsonicated and below 10 mg L−1 of MWCNT+NOM. In all cases, neither lethal effects nor drops in photosynthetic quantum yield were observed. After a 6-d exposure, a complete growth recovery was observed for all conditions except at the highest concentration of MWCNT+NOM. Different microscopic approaches using carbohydrates markers revealed the strong affinity between MWCNT and extracellular polymeric substances (EPS) produced by N. palea. These seem to constitute a defensive mechanism against MWCNT.
ISSN:1743-5390
1743-5404
DOI:10.3109/17435390.2014.918202