In vivo Biomodification of Lipid-Coated Carbon Nanotubes by <i>Daphnia magna</i>

Roberts, Aaron P.; Mount, Andrew S.; Seda, Brandon; Souther, Justin; Qiao, Rui; Lin, Sijie; Ke, Pu Chun; Rao, A. Muralikrishna; Klaine, Stephen J.

doi:10.1021/es062572a

Cited by 304 publications

(239 citation statements)

References 14 publications

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“…Biologically mediated transformation may include all of the previously described processes, with the exception of combustion. The rates and relative importance of each process is a result of conditions in the biological compartments, such as processes after ingestion by multicellular animals [46] or enzymatic reactions mediated by microorganisms [47]. One of the physical processes that will influence the final destination of the PM-ENM is abrasion (process 8) or mechanical erosion.…”

Section: Nanoparticle Releasementioning

confidence: 99%

“…Phenrat et al [70] reported that partial or complete oxidation of nanometer-sized zero-valent iron under environmental conditions decreased its redox activity, agglomeration, sedimentation rate, and toxicity to mammalian cells. Also, biological modification of ENM and microbially mediated redox processes can change the fate and toxicity of ENM such as quantum dots and carbon nanotubes [25,46,71].…”

Section: Nanoparticle Releasementioning

confidence: 99%

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Potential scenarios for nanomaterial release and subsequent alteration in the environment

Nowack¹,

Ranville²,

Diamond³

et al. 2011

Enviro Toxic and Chemistry

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533

353

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Abstract-The risks associated with exposure to engineered nanomaterials (ENM) will be determined in part by the processes that control their environmental fate and transformation. These processes act not only on ENM that might be released directly into the environment, but more importantly also on ENM in consumer products and those that have been released from the product. The environmental fate and transformation are likely to differ significantly for each of these cases. The ENM released from actual direct use or from nanomaterial-containing products are much more relevant for ecotoxicological studies and risk assessment than pristine ENM. Released ENM may have a greater or lesser environmental impact than the starting materials, depending on the transformation reactions and the material. Almost nothing is known about the environmental behavior and the effects of released and transformed ENM, although these are the materials that are actually present in the environment. Further research is needed to determine whether the release and transformation processes result in a similar or more diverse set of ENM and ultimately how this affects environmental behavior. This article addresses these questions, using four hypothetical case studies that cover a wide range of ENM, their direct use or product applications, and their likely fate in the environment. Furthermore, a more definitive classification scheme for ENM should be adopted that reflects their surface condition, which is a result of both industrial and environmental processes acting on the ENM. The authors conclude that it is not possible to assess the risks associated with the use of ENM by investigating only the pristine form of the ENM, without considering alterations and transformation processes. Environ. Toxicol. Chem. 2012;31:50-59. # 2011 SETAC

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Section: Nanoparticle Releasementioning

confidence: 99%

Section: Nanoparticle Releasementioning

confidence: 99%

Potential scenarios for nanomaterial release and subsequent alteration in the environment

Nowack¹,

Ranville²,

Diamond³

et al. 2011

Enviro Toxic and Chemistry

Self Cite

533

353

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show abstract

“…The ENMs could stick to these appendages, and eventually cause death by preventing ventilation. For example, milligram per liter levels of lysophosphatidylcholine-coated single-walled carbon nanotubes do stick to the surfaces of Daphnia magna in sufficient quantities to prevent swimming, causing the animals to sink to the bottom of the test vessels [58]. This in itself is not a problem for the test method-it is simply a nonchemical method of producing mortality-but it should be measured and distinguished from traditional chemical toxicity.…”

Section: P Subcapitatamentioning

confidence: 99%

Ecotoxicity test methods for engineered nanomaterials: Practical experiences and recommendations from the bench

Handy

Cornelis

Fernandes

et al. 2011

Enviro Toxic and Chemistry

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302

236

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Abstract-Ecotoxicology research is using many methods for engineered nanomaterials (ENMs), but the collective experience from researchers has not been documented. This paper reports the practical issues for working with ENMs and suggests nano-specific modifications to protocols. The review considers generic practical issues, as well as specific issues for aquatic tests, marine grazers, soil organisms, and bioaccumulation studies. Current procedures for cleaning glassware are adequate, but electrodes are problematic. The maintenance of exposure concentration is challenging, but can be achieved with some ENMs. The need to characterize the media during experiments is identified, but rapid analytical methods are not available to do this. The use of sonication and natural/synthetic dispersants are discussed. Nano-specific biological endpoints may be developed for a tiered monitoring scheme to diagnose ENM exposure or effect. A case study of the algal growth test highlights many small deviations in current regulatory test protocols that are allowed (shaking, lighting, mixing methods), but these should be standardized for ENMs. Invertebrate (Daphnia) tests should account for mechanical toxicity of ENMs. Fish tests should consider semistatic exposure to minimize wastewater and animal husbandry. The inclusion of a benthic test is recommended for the base set of ecotoxicity tests with ENMs. The sensitivity of soil tests needs to be increased for ENMs and shortened for logistics reasons; improvements include using Caenorhabditis elegans, aquatic media, and metabolism endpoints in the plant growth tests. The existing bioaccumulation tests are conceptually flawed and require considerable modification, or a new test, to work for ENMs. Overall, most methodologies need some amendments, and recommendations are made to assist researchers. Environ. Toxicol. Chem. 2012;31:15-31. # 2011 SETAC

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“…Few studies can be found in the literature examining CNT toxicity to aquatic biota. Roberts et al (2007) observed that lipid coated carbon nanomaterials may not be highly stable in aquatic environments due to biotic interactions. The authors reported that zooplankton (D. magna) not only ingested CNT aggregates from the water column, also but altered the lipid coating.…”

Section: Toxicitymentioning

confidence: 99%

“…Diameter may play a part in determining the degree to which NOM acids can stabilize tubes. Lin and Xing (2008) tested adsorption and stability of tannic acid to SWNTs and MWNTs of mean outer diameters from about 9 nm to 70 nm (Table 2) Obligate fine mesh grazing zooplankton, such as in the case of two cladocerans, Ceriodaphnia dubia and Daphnia magna, have been shown to ingest suspended CNT aggregates (Roberts et al 2007, Petersen et al 2009). In the pelagic zone, grazing zooplankton are the main primary consumer.…”

Section: Carbon Nanotubes In Aquatic Ecosystemsmentioning

confidence: 99%

Effects of suspended multi-walled carbon nanotubes on daphnid growth and reproduction

Alloy

2011

Ecotoxicology and Environmental Safety

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Multi-walled carbon nanotube aggregates can be suspended in the aqueous phase by natural organic matter. These aggregates are ingested by filter feeding zooplankton. Ingested aggregates result in decreased growth and decreased reproduction. These effects may be caused by reduction in energy input from normal feeding behavior.pH alters natural organic matter structure through changes in electrostatic repulsion. Altered natural organic matter structure changes multi-walled carbon nanotube aggregate size. This size variation with variation in pH is significant, but not large enough a change in size to alter toxicity, as the aggregate size range remains well within the particle size selection of the organisms.

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In vivo Biomodification of Lipid-Coated Carbon Nanotubes by Daphnia magna

Cited by 304 publications

References 14 publications

Potential scenarios for nanomaterial release and subsequent alteration in the environment

Potential scenarios for nanomaterial release and subsequent alteration in the environment

Ecotoxicity test methods for engineered nanomaterials: Practical experiences and recommendations from the bench

Effects of suspended multi-walled carbon nanotubes on daphnid growth and reproduction

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