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

Verneuil, L.; Silvestre, Jérôme; Mouchet, Florence; Flahaut, Emmanuel; Boutonnet, Jean-Charles; Bourdiol, Floriane; Bortolamiol, Tifania; Baqué, David; Gauthier, Laury; Pinelli, Éric

doi:10.3109/17435390.2014.918202

Cited by 43 publications

(44 citation statements)

References 59 publications

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“…These tests were carried using the same device as used in a previous study [27]. Briefly, two stacked 12-well plates allowed for the assessment of the total exposure effect, providing an estimation of shading using DWCNT suspensions as external filters.…”

Section: Exposure Strategymentioning

confidence: 99%

“…Moreover, diatoms possess a silicified cell wall called a frustule, which confers protection against environmental dangers such as abrasion [29]. The frustule of some species also presents nano-metric pores which can partially or completely prevent the internalization of nanoparticles [27,30]. These features make them of particular interest for toxicity tests and understanding toxicity mechanisms [31].…”

Section: Introductionmentioning

confidence: 98%

“…In a previous study [27] we highlighted the strong interaction between multi-walled carbon nanotubes (MWCNTs) and the extracellular polymeric substances (EPS) produced by the benthic diatoms Nitzschia palea (Kü tzing) W.Smith (N. palea). It was hypothesized that EPS conferred an efficient protection against MWCNTs to benthic diatoms and that an energetic trade-off could be made by N. palea by switching energetic allocation from growth to protection via EPS production.…”

Section: Introductionmentioning

confidence: 99%

“…They may be partially recycled by organisms using it as a nutrient storage area [25]. Finally, they provide protection against different biocides [22,23], and against nanoparticles or ions that they release [26,27]. Among benthic photosynthetic microorganisms, diatoms often represent the main component of photo-autotrophic biofilms and are ubiquitous in low depth aquatic environments.…”

Section: Introductionmentioning

confidence: 99%

“…It was hypothesized that EPS conferred an efficient protection against MWCNTs to benthic diatoms and that an energetic trade-off could be made by N. palea by switching energetic allocation from growth to protection via EPS production. This could explain the growth inhibition often measured only at early stages of exposure [14,27]. In this study, the toxicity of DWCNTs dispersed by an environmentally relevant amount of NOM (as it commonly happens in rivers and lakes) on the common freshwater diatom N. palea was assessed, focusing on growth inhibition, viability and the photochemical quantum yield of photosystem II.…”

Section: Introductionmentioning

confidence: 99%

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Double walled carbon nanotubes promote the overproduction of extracellular protein-like polymers in Nitzschia palea: An adhesive response for an adaptive issue

Verneuil

Silvestre

Randrianjatovo

et al. 2015

Carbon

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A B S T R A C TThe present study assessed the effects of double-wall carbon nanotubes (DWCNTs) dispersed in the presence of a realistic concentration of natural organic matter (NOM, 10 mg L À1 ) on the benthic diatom Nitzschia palea using toxicity tests and quantitative/qualitative extracellular polymeric substances (EPS) assays. No toxic effect was observed. A growth delay was measured after 48 h of exposure to concentrations of DWCNTs ranging from 1 mg L À1 ($29%) to 50 mg L À1 ($84%). Extracellular carbohydrates and proteins were extracted using a sequential multi-methods protocol to collect soluble, hydrophobic and ion-bridged extracellular polymeric substances (EPS). Extracted EPS were analyzed by colorimetric assays and size exclusion chromatography. The results highlighted a higher EPS concentration in exposed cultures that was primarily caused by an overproduction of protein-like polymers (protein or glycoproteins, PLPs). Such EPS overproduction and increase in proteins/carbohydrates ratio can partially explain the observed growth inhibition. EPS were preferentially extracted using hydrophobic conditions and were mainly composed of PLPs with either low (10 kDa) or high (174 kDa) molecular weights. These data highlights the affinity between DWCNTs and EPS, which is primarily driven by both physical and hydrophobic interactions. This indicates that N. palea can respond to DWCNTs by forming an EPS network optimized for adhering to and efficiently wrapping DWCNTs.

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Section: Exposure Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Double walled carbon nanotubes promote the overproduction of extracellular protein-like polymers in Nitzschia palea: An adhesive response for an adaptive issue

Verneuil

Silvestre

Randrianjatovo

et al. 2015

Carbon

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The Interaction between Electricigens and Carbon Nanotube Forest and Electricity Generation Performance in MFC

Zhao

Song

et al. 2018

Energy Tech

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Carbon nanotube forest (CNTFs) is grown vertically on the surface of highly conductive mesophase pitch carbon fibers (Pitch‐CFs) in the chemical vapor deposition method. Then the CNTFs‐modified CFs (CNTFs‐Pitch‐CF) as an anode material is assembled into the single chamber microbial fuel cells (MFCs). Interaction between electricigens and carbon nanotubes (CNTs) is investigated. The toxicity of the CNTs can make electricigens expend energy or electrons to produce exopolysaccharid (EPS) as much as possible. Accordingly, this leads to low voltage and the long start up time for the CNTFs‐Pitch‐CF anode in the early period. When the activity of electricigens with the EPS reaches a stable state over time, the output voltage rises rapidly and the maximum power density of the CNTFs‐Pitch‐CF‐equiped MFC is increased to 1112 mW/m2, which is approximately 1.55‐fold higher than Pitch‐CF‐equiped MFC. And the CNTFs‐Pitch‐CF‐equiped MFC can keep high electricity generation performance of MFCs for a long time, which is 75 % larger than the Pitch‐CF‐equiped MFC. This method of the CNTFs modifying the CFs provides a new idea for increasing the electricity generation performance of the MFCs.

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Nanoecotoxicity assessment of graphene oxide and its relationship with humic acid

Castro

Clemente²,

Jonsson

et al. 2018

Enviro Toxic and Chemistry

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The risk assessment of nanomaterials is essential for regulatory purposes and for sustainable nanotechnological development. Although the application of graphene oxide has been widely exploited, its environmental risk is not well understood because several environmental conditions can affect its behavior and toxicity. In the present study, the graphene oxide effect from aquatic ecosystems was assessed considering the interaction with humic acid on 9 organisms: Raphidocelis subcapitata (green algae), Lemna minor (aquatic plant), Lactuca sativa (lettuce), Daphnia magna (planktonic microcrustacean), Artemia salina (brine shrimp), Chironomus sancticaroli (Chironomidae), Hydra attenuata (freshwater polyp), and Caenorhabditis elegans and Panagrolaimus sp. (nematodes). The no-observed-effect concentration (NOEC) was calculated for each organism. The different criteria used to calculate NOEC values were transformed and plotted as a log-logistic function. The hypothetical 5 to 50% hazardous concentration values were, respectively, 0.023 (0.005-0.056) and 0.10 (0.031-0.31) mg L for graphene oxide with and without humic acid, respectively. The safest scenario associated with the predicted no-effect concentration values for graphene oxide in the aquatic compartment were estimated as 20 to 100 μg L (in the absence of humic acid) and 5 to 23 μg L (in the presence of humic acid). Finally, the present approach contributed to the risk assessment of graphene oxide-based nanomaterials and the establishment of nano-regulations. Environ Toxicol Chem 2018;37:1998-2012. © 2018 SETAC.

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

Cited by 43 publications

References 59 publications

Double walled carbon nanotubes promote the overproduction of extracellular protein-like polymers in Nitzschia palea: An adhesive response for an adaptive issue

Double walled carbon nanotubes promote the overproduction of extracellular protein-like polymers in Nitzschia palea: An adhesive response for an adaptive issue

The Interaction between Electricigens and Carbon Nanotube Forest and Electricity Generation Performance in MFC

Nanoecotoxicity assessment of graphene oxide and its relationship with humic acid

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