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Distinct biokinetic behavior of ZnO nanoparticles in Daphnia magna quantified by synthesizing ⁶⁵Zn tracer.
Water Res. 2013 Feb 01; 47(2):895-902.WR

Abstract

ZnO nanoparticles (nZnO) are widely used in different fields and there are increasingly concerns for their hazards in the environment. The biokinetic behavior of nZnO in aquatic organisms however remains essentially unknown. The aim of this study was to separate the uptake and depuration behavior of nZnO and Zn ions in a freshwater cladoceran Daphnia magna. We for the first time radio-synthesized the nZnO and followed its uptake and depuration in D. magna. Two concentrations (0.5 mg/L and 2 mg/L) of nZnO were employed in this study, and the releases of nZnO into soluble Zn were 20-30% during the experiments. We found that the uptake of nZnO by D. magna was related to nZnO concentration. The uptake of ionic Zn released from nZnO by D. magna followed a linear increase during the exposure period (40 min or 8 h). The nanoparticles could enter the body of daphnids and reached a peak within a short time, followed by a rapid release. Uptake of nanoparticles was mainly by direct ingestion, with negligible nZnO absorption onto the carapace. The depuration of nZnO was also rapid and controlled by nZnO dissolution in the body of D. magna. Our study showed a distinctive uptake mode of nZnO and suggested that both dissolved Zn and nanoparticles should be considered in studying the toxicology of nZnO.

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Authors+Show Affiliations

Li WM
Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
Wang WX
No affiliation info available

MeSH

AbsorptionAnimalsBehavior, AnimalBiodegradation, EnvironmentalBiological TransportDaphniaFeeding BehaviorFresh WaterIsotope LabelingKineticsMetal NanoparticlesOsmolar ConcentrationSolubilityTissue DistributionToxicity Tests, AcuteWater Pollutants, ChemicalZincZinc OxideZinc RadioisotopesZooplankton

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23200802

Citation

Li, Wei-Man, and Wen-Xiong Wang. "Distinct Biokinetic Behavior of ZnO Nanoparticles in Daphnia Magna Quantified By Synthesizing ⁶⁵Zn Tracer." Water Research, vol. 47, no. 2, 2013, pp. 895-902.
Li WM, Wang WX. Distinct biokinetic behavior of ZnO nanoparticles in Daphnia magna quantified by synthesizing ⁶⁵Zn tracer. Water Res. 2013;47(2):895-902.
Li, W. M., & Wang, W. X. (2013). Distinct biokinetic behavior of ZnO nanoparticles in Daphnia magna quantified by synthesizing ⁶⁵Zn tracer. Water Research, 47(2), 895-902. https://doi.org/10.1016/j.watres.2012.11.018
Li WM, Wang WX. Distinct Biokinetic Behavior of ZnO Nanoparticles in Daphnia Magna Quantified By Synthesizing ⁶⁵Zn Tracer. Water Res. 2013 Feb 1;47(2):895-902. PubMed PMID: 23200802.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Distinct biokinetic behavior of ZnO nanoparticles in Daphnia magna quantified by synthesizing ⁶⁵Zn tracer. AU - Li,Wei-Man, AU - Wang,Wen-Xiong, Y1 - 2012/11/20/ PY - 2012/08/18/received PY - 2012/11/05/revised PY - 2012/11/12/accepted PY - 2012/12/4/entrez PY - 2012/12/4/pubmed PY - 2013/6/21/medline SP - 895 EP - 902 JF - Water research JO - Water Res VL - 47 IS - 2 N2 - ZnO nanoparticles (nZnO) are widely used in different fields and there are increasingly concerns for their hazards in the environment. The biokinetic behavior of nZnO in aquatic organisms however remains essentially unknown. The aim of this study was to separate the uptake and depuration behavior of nZnO and Zn ions in a freshwater cladoceran Daphnia magna. We for the first time radio-synthesized the nZnO and followed its uptake and depuration in D. magna. Two concentrations (0.5 mg/L and 2 mg/L) of nZnO were employed in this study, and the releases of nZnO into soluble Zn were 20-30% during the experiments. We found that the uptake of nZnO by D. magna was related to nZnO concentration. The uptake of ionic Zn released from nZnO by D. magna followed a linear increase during the exposure period (40 min or 8 h). The nanoparticles could enter the body of daphnids and reached a peak within a short time, followed by a rapid release. Uptake of nanoparticles was mainly by direct ingestion, with negligible nZnO absorption onto the carapace. The depuration of nZnO was also rapid and controlled by nZnO dissolution in the body of D. magna. Our study showed a distinctive uptake mode of nZnO and suggested that both dissolved Zn and nanoparticles should be considered in studying the toxicology of nZnO. SN - 1879-2448 UR - https://www.unboundmedicine.com/medline/citation/23200802/Distinct_biokinetic_behavior_of_ZnO_nanoparticles_in_Daphnia_magna_quantified_by_synthesizing_⁶⁵Zn_tracer_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(12)00830-5 DB - PRIME DP - Unbound Medicine ER -