| Acute toxicity of two CdSe/ZnSe quantum dots with different surface coating in Daphnia magna under various light conditions. | |
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MedLine Citation:
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PMID: 19575465 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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With an increasing use of quantum dots (QDs) in many applications, their potential hazard is of growing concern. However, little is known about their ecotoxicity, especially in vivo. In the present study, we employed freshwater macroinvertebrate, Daphnia magna, to evaluate toxicity characteristics of cadmium selenide/zinc selenide (CdSe/ZnSe) in relation to surface coatings, e.g., mercaptopropionic acid QD ((MPA)QD), and gum arabic/tri-n-octylphosphine oxide QD ((GA/TOPO)QD), and light conditions, i.e., dark, fluorescent light, environmental level of ultraviolet (UV) light, and sunlight. The results of the present study showed that D. magna was more susceptible to (GA/TOPO)QD exposure compared to (MPA)QD. The surface coating of QD appeared to determine the stability of QDs and hence the toxicity, potentially by size change of or the release of toxic components from QDs. However, (GA/TOPO)QD was still less toxic than the equivalent level of CdCl₂. The toxicity of all the tested compounds increased by changing the light condition from dark to white fluorescence to UV-B light, and to natural sunlight. The effect of light condition on QDs toxicity could also be explained by photostability of the QDs, which would affect size of the particle, release of toxic component ions, and generation of reactive oxygen species. Considering increasing use of QDs in various applications, their environmental fates and corresponding toxic potentials deserve further investigation. |
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Authors:
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Jiyoun Lee; Kyunghee Ji; Jungkon Kim; Chansik Park; Kook Hee Lim; Tae Hyun Yoon; Kyungho Choi |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Environmental toxicology Volume: 25 ISSN: 1522-7278 ISO Abbreviation: Environ. Toxicol. Publication Date: 2010 Dec |
Date Detail:
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Created Date: 2010-11-22 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100885357 Medline TA: Environ Toxicol Country: United States |
Other Details:
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Languages: eng Pagination: 593-600 Citation Subset: IM |
Copyright Information:
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Copyright © 2009 Wiley Periodicals, Inc. |
Affiliation:
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School of Public Health, Seoul National University, Seoul, 110-799 Korea. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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