Biotoxicity of nanoparticles: Effect of natural organic matter

Lee, S; Kim, K; Shon, HK; Kim, SD; Cho, J

Biotoxicity of nanoparticles: Effect of natural organic matter

Lee, S Kim, K Shon, HK

Kim, SD Cho, J

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Publication Type:: Journal Article
Citation:: Journal of Nanoparticle Research, 2011, 13 (7), pp. 3051 - 3061
Issue Date:: 2011-07-01

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Field	Value	Language
dc.contributor.author	Lee, S	en_US
dc.contributor.author	Kim, K	en_US
dc.contributor.author	Shon, HK https://orcid.org/0000-0002-3777-7169	en_US
dc.contributor.author	Kim, SD	en_US
dc.contributor.author	Cho, J	en_US
dc.date.issued	2011-07-01	en_US
dc.identifier.citation	Journal of Nanoparticle Research, 2011, 13 (7), pp. 3051 - 3061	en_US
dc.identifier.issn	1388-0764	en_US
dc.identifier.uri	http://hdl.handle.net/10453/29443
dc.description.abstract	Various natural organic matters (NOM) with different characteristics in aquatic environment may affect toxicity of leased nanoparticles, owing to interactions between NOM and nanoparticles. This study investigated the effect of NOM and physical characteristics of the effluent organic matter (EfOM) on the ecotoxicity of quantum dots (QD) using Daphnia magna. Organic matter samples were obtained from: Yeongsan River (YR-NOM), Dongbuk Lake (DLNOM), Damyang wastewater treatment plant (EfOM), and Suwannee River NOM (SR-NOM). The QD was composed of a CdSe core, ZnS shell, and polyethylene glycol coating. The average size of the investigated QD was 4.8, 56.5, and 25.0 nm determined by transmission electron microscopy, dynamic light scattering, and asymmetric flow field-flow fractionation, respectively. The relative hydrophobicity of NOM was investigated using both specificUVabsorbance at 254 nmandXAD-8/4 resins. The sorption of NOM on the QD was measured using a fluorescence quenching method. The highest hydrophobicity was exhibited by the SR-NOM, while the lowest was recorded for the DL-NOM. All tested NOMs significantly reduced the acute toxicity of D. magna when adsorbed to QD, and the order of effectiveness for each NOM was as follows: SRNOM[ EfOM[YS-NOM[DL-NOM. The sorption of NOM on the QD surface caused a decrease in the fluorescence intensity of QD at increasing NOM concentration. This suggests that the NOM coating influenced the physicochemical characteristics ofQDin the internal organs of D. magna by inducing a reduced bioavailability. Results from this study revealed that NOMwith relatively high hydrophobicity had a greater capability of inducing toxicity mitigation. © Springer Science+Business Media B.V. 2010.	en_US
dc.relation.ispartof	Journal of Nanoparticle Research	en_US
dc.relation.isbasedon	10.1007/s11051-010-0204-z	en_US
dc.subject.classification	Nanoscience & Nanotechnology	en_US
dc.title	Biotoxicity of nanoparticles: Effect of natural organic matter	en_US
dc.type	Journal Article
utslib.citation.volume	7	en_US
utslib.citation.volume	13	en_US
utslib.for	0912 Materials Engineering	en_US
utslib.for	0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics	en_US
utslib.for	1007 Nanotechnology	en_US
dc.location.activity	WOS:000291746600038	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access
pubs.issue	7	en_US
pubs.publication-status	Published	en_US
pubs.volume	13	en_US

Abstract:

Various natural organic matters (NOM) with different characteristics in aquatic environment may affect toxicity of leased nanoparticles, owing to interactions between NOM and nanoparticles. This study investigated the effect of NOM and physical characteristics of the effluent organic matter (EfOM) on the ecotoxicity of quantum dots (QD) using Daphnia magna. Organic matter samples were obtained from: Yeongsan River (YR-NOM), Dongbuk Lake (DLNOM), Damyang wastewater treatment plant (EfOM), and Suwannee River NOM (SR-NOM). The QD was composed of a CdSe core, ZnS shell, and polyethylene glycol coating. The average size of the investigated QD was 4.8, 56.5, and 25.0 nm determined by transmission electron microscopy, dynamic light scattering, and asymmetric flow field-flow fractionation, respectively. The relative hydrophobicity of NOM was investigated using both specificUVabsorbance at 254 nmandXAD-8/4 resins. The sorption of NOM on the QD was measured using a fluorescence quenching method. The highest hydrophobicity was exhibited by the SR-NOM, while the lowest was recorded for the DL-NOM. All tested NOMs significantly reduced the acute toxicity of D. magna when adsorbed to QD, and the order of effectiveness for each NOM was as follows: SRNOM[ EfOM[YS-NOM[DL-NOM. The sorption of NOM on the QD surface caused a decrease in the fluorescence intensity of QD at increasing NOM concentration. This suggests that the NOM coating influenced the physicochemical characteristics ofQDin the internal organs of D. magna by inducing a reduced bioavailability. Results from this study revealed that NOMwith relatively high hydrophobicity had a greater capability of inducing toxicity mitigation. © Springer Science+Business Media B.V. 2010.

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