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Title of Journal: J Nanopart Res

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Abbravation: Journal of Nanoparticle Research

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Springer Netherlands

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DOI

10.1002/mrm.22529

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1572-896X

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Evidence of oneway flow bioaccumulation of gold n

Authors: Miguel Larguinho Daniela Correia Mário S Diniz Pedro V Baptista
Publish Date: 2014/07/15
Volume: 16, Issue: 8, Pages: 2549-
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Abstract

This work reports a oneway flow bioaccumulation of gold nanoparticles AuNPs in aquatic organisms between two trophic levels First Dunaliella salina cells were exposed to citratecapped AuNPs at different concentrations and during distinct exposure periods to assess internalization and behavior Afterward D salina was incubated with both citratecapped and functionalized PEGylated AuNPs for 24 h and later fed to Mytilus galloprovincialis Analysis was carried out to assess Au content histological differences and oxidative stress These algae were fed to the model organism M galloprovincialis Mediterranean mussel as it is considered of major importance for assessing toxic effects and bioaccumulation of different pollutants in aquatic environments Elemental Au analysis revealed an uptake of about 76  of the initial amount of AuNPs and 36  for PEGylated AuNPs in microalgae Mussel gills and digestive gland showed variable Au content in individuals fed with D salina previously exposed to AuNPs No significant morphological alterations were observed in D salina or mussel digestive glands Glutathionestransferase activity and total antioxidant capacity were assessed as oxidative stress biomarkers showing that AuNPs are not prone to trigger the induction of defenses against oxidative stressWe acknowledge Fundação para a Ciência e a Tecnologia FCT/MEC for financial support CIGMH PEstOE/SAU/UI0009/2011 REQUIMTE PestC/EQB/LA0006/2013 Projects PTDC/BBBNAN/1812/2012 PTDC/QUIQUI/112597/2009 PTDC/CTMNAN/109877/2009 SFRH/BD/64026/2009 for M Larguinho The authors further acknowledge J Frias and A Cordeiro for the aid in microalgae dynamics of growth and measurements

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