Mechanisms of silver nanoparticle toxicity to the coastal marine diatom Chaetoceros curvisetus
Data de publicació2017-09-07
Browning, Thomas J.
Achterberg, Eric P.
El-Shahawi, Mohammad S.
MetadadesMostra el registre d'unitat complet
Inputs of silver nanoparticles (AgNPs) to marine waters continue to increase yet mechanisms of AgNPs toxicity to marine phytoplankton are still not well resolved. This study reports a series of toxicity experiments on a representative coastal marine diatom species Chaetoceros curvisetus using the reference AgNP, NM-300K. Exposure to AgNPs resulted in photosynthetic impairment and loss of diatom biomass in proportion to the supplied AgNP dose. The underlying mechanism of toxicity was explored via comparing biological responses in parallel experiments. Diatom responses to AgNP, free Ag(I) species, and dialysis bag-retained AgNP treatments showed marked similarity, pointing towards a dominant role of Ag(I) species uptake, rather than NPs themselves, in inducing the toxic response. In marked contrast to previous studies, addition of the organic complexing agent cysteine (Cys) alongside Ag only marginally moderated toxicity, implying AgCys− complexes were bioavailable to this diatom species. A preliminary field experiment with a natural phytoplankton community in the southeast Atlantic Ocean showed no significant toxic response at a NM-300 K concentration that resulted in ~40% biomass loss in the culture studies, suggesting a modulating effect of natural seawaters on Ag toxicity.
És part deScientific Reports, 2017, vol. 7, num. 10777
Projectes de recerca europeus
Els fitxers de llicència següents estan associats amb aquest element:
Aquest document està subjecte a una llicència Creative Commons.cc-by (c) Lodeiro, Pablo et al., 2017
Mostrant elements relacionats per títol, autor i matèria.
Detection of silver nanoparticles in seawater at ppb levels using UV-visible spectrophotometry with long path cells Lodeiro, Pablo; Achterberg, Eric P.; El-Shahawi, Mohammad S. (Elsevier, 2017-03-01)Silver nanoparticles (AgNPs) are emerging contaminants that are difficult to detect in natural waters. UV-visible spectrophotometry is a simple technique that allows detection of AgNPs through analysis of their characteristic ...
Silver nanoparticles coated with natural polysaccharides as models to study AgNP aggregation kinetics using UV-Visible spectrophotometry upon discharge in complex environments Lodeiro, Pablo; Achterberg, Eric P.; Pampín, Joaquín; Affatati, Alice; El-Shahawi, Mohammad S. (Elsevier, 2016-01-01)This study provides quantitative information on the aggregation and dissolution behaviour of silver nanoparticles (AgNPs) upon discharge in fresh and sea waters, represented here as NaCl solutions of increasing ionic ...
Effect of polymer coating composition on the aggregation rates of Ag nanoparticles in NaCl solutions and seawaters Lodeiro, Pablo; Achterberg, Eric P.; Rey Castro, Carlos; El-Shahawi, Mohammad S. (Elsevier, 2018-08-01)The aggregation behaviour of polymer-coated silver nanoparticles (AgNPs) was characterized in NaCl solutions, and in two seawaters of different salinities and dissolved organic matter (DOM) contents. Representative organic ...