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Toxicity of single-walled carbon nanotubes on green microalga Chromochloris zofingiensis
Link to Journal Abstract
Nanoparticles, or particles in size of 1–100 nm, are extensively used in the world in different applications. For instance, single-walled carbon nanotubes (SWCNTs) are commonly used in consumer products, such as biosensors, drug and vaccine delivery transporters, and novel biomaterials. Although nanoparticles do not cause safety concerns to consumers who use nanoparticle-containing products, these small particles are potentially harmful for workers who produce them in factories or in cases of discharge to aquatic ecosystems. SWCNTs do not have a natural analogue, so the effects on health of their disposal remain largely unknown. In this study, we evaluated the effects of SWCNTs on a population of the green microalga Chromochloris zofingiensis and the profile and production of pigments and fatty acids. The alga was incubated with SWCNTs for 6 days in 0 (control), 40, 80, 160, or 320 mg/L concentrations. SWCNTs showed both positive and negative effects on the growth of C. zofingiensis, with a biomass enhancement at low levels (40–160 mg/L) but inhibition at high levels (320 mg/L). By contrast, a decreased accumulation of fatty acids and pigments of C. zofingiensis was observed over the range of the tested concentrations. These results indicate that the markers on the inhibitive toxicity of SWCNTs are increasingly sensitive in the following order: biomass and fatty acids < primary carotenoids < chlorophylls < secondary carotenoids. C. zofingiensis is a suitable microalga for evaluating the ecotoxicological hazards of SWCNTs, especially in terms of pigmentation response.
In this study, the authors evaluated the effects of single-walled carbon nanotubes (SWCNTs) on a population of the green microalga Chromochloris zofingiensis and the profile and production of pigments and fatty acids.
Exposure Or Hazard Target
Method Of Study
Environmental Fate and Transport
Risk Exposure Group
Chinese Journal of Oceanology and Limnology, 31(2): 306-311 (March 2013)
Chinese Journal of Oceanology and Limnology
Wang Y, Yang K
Last updated on April 19, 2013
This work is supported in part by the Nanoscale Science and Engineering Initiative of the National Science Foundation
under NSF Award Number EEC-0118007.
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