FEURTET-MAZEL, Agnès; MORNET, Stéphane; CHARRON, Laëtitia; MESMER-DUDONS, Nathalie; MAURY-BRACHET, Régine; BAUDRIMONT, Magalie

doi:10.1007/s11356-015-4139-x

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FEURTET-MAZEL, Agnès
Environnements et Paléoenvironnements OCéaniques [EPOC]

MORNET, Stéphane
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

CHARRON, Laëtitia
Environnements et Paléoenvironnements OCéaniques [EPOC]

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Article de revue

Ce document a été publié dans

Environmental Science and Pollution Research. 2016, vol. 23, n° 5, p. 4334-4339

Springer Verlag

Résumé en anglais

Testing biotransformation capacities of living aquatic microalgae diatoms to naturally synthetize gold nanoparticles (AuNP) from gold salts and assessing aftereffects on their viability by microscope observations is a great challenge. In this work, a laboratory experiment was conducted, which aimed to observe (i) directly by transmission electronic and light microscopy and (ii) through indirect measurements (UV-visible spectroscopy) the periphytic freshwater diatom Eolimna minima exposed to gold salts. This work revealed the capacity of E. minima to intracellularly biosynthetize AuNP and to tolerate it. AuNP synthesis appears as a mechanism of detoxification to protect diatom from gold salt contamination. We also pointed out the risks associated with the spread of diatoms full of AuNP, through the trophic web of freshwater ecosystems. The preponderant part of the diatoms in natural biofilms associated with their position at the basis of the trophic webs in rivers could then make them responsible for the contamination of their consumers (grazer animals) and consequently for the potential release of AuNP through the entire food web.< Réduire

Mots clés en anglais

Periphytic microalgae

Diatom

Aquatic environment

Biomineralization of gold salts

Gold nanoparticles

Contamination

Microscopy

Laboratory experiment

DOI

http://dx.doi.org/10.1007/s11356-015-4139-x

Project ANR

Approches à différentes échelles pour caractériser les interactions cellulaires, le transfert trophique et les impacts toxiques de nanoparticules métalliques chez les organismes aquatiques

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Importé de hal