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Nuclear microscopy as a tool in TiO2 nanoparticles bioaccumulation studies in aquatic species

2013Journal article Open access
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dc.contributor.authorPinheiro, Teresa
dc.contributor.authorMoita, Liliana
dc.contributor.authorSilva, Luís
dc.contributor.authorMendonça, E.
dc.contributor.authorPicado, Ana
dc.date.accessioned2013-10-07T15:11:12Z
dc.date.available2013-10-07T15:11:12Z
dc.date.issued2013
dc.description.abstractEngineered Titanium nanoparticles are used for a wide range of applications from coatings, sunscreen cosmetic additives to solar cells or water treatment agents. Inevitably environmental exposure can be expected and data on the ecotoxicological evaluation of nanoparticles are still scarce.The potential effects of nanoparticles of titanium dioxide (TiO2) on two model organisms, the water flea, Daphnia magna and the duckweed Lemna minor, were examined in semichronic toxicity tests. Daphnia and Lemna were exposed to TiO2 nanoparticles (average particle size value of 28 ± 11 nm (n = 42); concentration range, 1.4–25 mg/L) by dietary route and growth in medium containing the nanoparticles of TiO2, respectively. Both morphology and microdistribution of Ti in the individuals were examined by nuclear microscopy techniques. A significant amount of TiO2 was found accumulated in Daphnia exposed to nanoparticles. Nuclear microscopy imaging revealed that Ti was localized only in the digestive tract of the Daphnia, which displayed difficulty in eliminating the nanoparticles from their body. Daphnia showed higher mortality when exposed to higher concentrations of TiO2 (>10 mg/L). The exposure to TiO2 nanoparticles above 25 mg/L caused morphological alterations in Lemna. The roots became stiff and fronds colorless. The Ti mapping of cross-sections of roots and fronds showed that Ti was mainly deposited in the epidermis of the fronds and roots, with minor internalization. In summary, exposure of aquatic organisms to TiO2 nanoparticles may alter the physiology of these organisms at individual and population levels, posing risks to aquatic ecosystems.por
dc.identifier.citationPinheiro, T.; Moita, L.; Silva, L.; Mendonça, E.; Picado, A. Nuclear microscopy as a tool in TiO2 nanoparticles bioaccumulation studies in aquatic species. In: Nuclear Instruments and Methods in Physics Research B, 2013, Vol. 306, p. 117-120por
dc.identifier.issn0168-583X
dc.identifier.urihttp://hdl.handle.net/10400.9/2014
dc.language.isoengpor
dc.publisherElsevierpor
dc.relation.publisherversionhttp://dx.doi.org/10.1016/j.nimb.2012.12.049por
dc.subjectNanotoxicitypor
dc.subjectTitanium dioxidepor
dc.subjectDaphniapor
dc.subjectLemnapor
dc.subjectNuclear microscopypor
dc.titleNuclear microscopy as a tool in TiO2 nanoparticles bioaccumulation studies in aquatic speciespor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage120por
oaire.citation.startPage117por
oaire.citation.titleNuclear Instruments and Methods in Physics Research Bpor
oaire.citation.volume306por
person.familyNameSilva
person.familyNamePicado
person.givenNameLuís
person.givenNameAna
person.identifier.ciencia-id0A1D-64E2-60DF
person.identifier.orcid0000-0001-7426-2247
person.identifier.orcid0000-0001-5866-6137
person.identifier.scopus-author-id57001019800
rcaap.rightsopenAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication3771c6d0-1b16-40ae-b753-9e3beb48673a
relation.isAuthorOfPublication16d7b846-5519-4d47-a88e-29a8c594852a
relation.isAuthorOfPublication.latestForDiscovery3771c6d0-1b16-40ae-b753-9e3beb48673a

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