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

Verneuil, Laurent and Silvestre, Jérôme and Mouchet, Florence and Flahaut, Emmanuel and Boutonnet, Jean-Charles and Bourdiol, Floriane and Bortolamiol, Tifania and Baqué, David and Gauthier, Laury and Pinelli, Eric Multi-walled carbon nanotubes, natural organic matter, and the benthic diatom Nitzschia palea: “A sticky story”. (2015) Nanotoxicology, 9 (2). 219-229. ISSN 1743-5390

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Official URL: http://dx.doi.org/10.3109/17435390.2014.918202

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 (10mgL-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 10mgL-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.

Item Type:Article
Additional Information:Thanks to Taylor & Francis editor. The definitive version is available at http://tandfonline.com
HAL Id:hal-01475246
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Arkema (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:23 Feb 2017 14:15

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