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Quantitative evaluation and in vivo visualization of mercury ion bioaccumulation in rotifers by novel aggregation-induced emission fluorogen nanoparticles

Abstract

In this study, the specifically-designed aggregation-induced emission fluorogen (AIEgen) with nanoparticle aggregates was used to quantitatively evaluate the bioaccumulation of Hg2+ and in vivo visualize Hg2+ kinetics within the rotifer Brachionus plicatilis for the first time. Quantitative results showed that a sharp drop in Hg2+ concentration occurred at the very beginning in the medium containing rotifers and Hg2+, showing a quick initial uptake of Hg2+ by rotifers and reaching a plateau concentration in the medium after 5 min. With an increase in rotifer density, the amount of bioaccumulation increased in the rotifer. However, the bioaccumulation efficiency of Hg2+ decreased from 5.28 µg/mg/h at a low rotifer density of 0.093 mg /ml to 2.61 µg/mg/h at a high rotifer density of 0.375 mg/mL. Moreover, the fluorescent images and spectra results illustrated that the ingestion of Hg2+ in the rotifer was via the mouth surrounded by the ciliary corona to the digestive tract, and Hg2+ could not permeate into the body integument through diffusion at the study period. Hg2+-induced fluorescence in rotifers dissipated in 6 h after staining possibly through defecation and excretion. This study indicates that inorganic mercury can be quickly ingested by a rotifer via feeding, but is unlikely deposited as methylated mercury in rotifer tissues.

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Publication details

The article was received on 03 Jul 2017, accepted on 12 Sep 2017 and first published on 12 Sep 2017


Article type: Paper
DOI: 10.1039/C7EN00599G
Citation: Environ. Sci.: Nano, 2017, Accepted Manuscript
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    Quantitative evaluation and in vivo visualization of mercury ion bioaccumulation in rotifers by novel aggregation-induced emission fluorogen nanoparticles

    Y. Jiang, T. He, Y. Chen, Y. Ruan, Y. Zhou, B. Z. Tang, J. Qin and Y. Tang, Environ. Sci.: Nano, 2017, Accepted Manuscript , DOI: 10.1039/C7EN00599G

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