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In vivo biodegradation of colloidal quantum dots by a freshwater invertebrate, Daphnia magna

Title
In vivo biodegradation of colloidal quantum dots by a freshwater invertebrate, Daphnia magna
Author
윤태현
Keywords
Daphnia magna; Quantum dot; Biodegradation; Manufactured nanomaterials; Fluorescence spectromicroscopy
Issue Date
2012-04
Publisher
ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Citation
AQUATIC TOXICOLOGY, 114, 217-222
Abstract
Impacts of planktonic invertebrate, Daphnia magna, on the speciation of colloidal quantum dots (QD) were investigated using fluorescence spectromicroscopic technique. Well-dispersed (GA/TOPO)QD were prepared by forming a supramolecular assembly of hydrophobic (TOPO)QD with biomacromolecules (i.e., Gum Arabic, GA). Biological degradation of this nanomaterial was monitored by fluorescence spectromicroscopic methods. Our study confirmed the major uptake pathway of manufactured nanomaterials and in vivo biodegradation processes in a well-known toxicity test organism, D. magna. In addition, we also found that D. magna can induce significant deterioration of aquatic media by releasing fragments of partially degraded QD colloids. These biological processes may significantly change the predicted toxicities of nanomaterials in aquatic environments. Thus, we propose that the impacts of aquatic living organisms on the environmental fate of manufactured nanomaterials (MNs) should be carefully taken into account when assessing the risk of MNs to the environment and human health. (c) 2012 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0166445X12000914http://hdl.handle.net/20.500.11754/42598
ISSN
0166-445X
DOI
10.1016/j.aquatox.2012.02.033
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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