Silver nanoparticle dissolution in the presence of ligands and of hydrogen peroxide

Sigg, Laura; Lindauer, Ursula

doi:10.1016/j.envpol.2015.08.017

Cited by 46 publications

(32 citation statements)

References 34 publications

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“…In a previous study, this cell density was shown to be low enough to ensure that Ag concentrations did not decrease significantly over the duration of the short term experiments [20]. Cysteine was used to stop (or significantly reduce) bioaccumulation at a selected timepoint, as it can easily bind to Ag + ion and limit its bioavailability [18,20,34]. Triplicate, 45 mL samples from the exposure medium were mixed with 5 mL of 5×10 -2 M cysteine, gently shaken for 1 min, and then filtered over 3.0 μm nitrocellulose filter membranes (SSWP, Millipore) (for AgNO3 experiments) or 3.0 μm polycarbonate filter membranes (TSTP, Isopore) (for Ag NP experiments).…”

Section: Methodsmentioning

confidence: 99%

“…3B). The observation that Ag NP dissolution increased dramatically in the biochemically rich matrices-either in the wastewater medium or in the algal growth medium containing algal exudates-can be explained by the complexation of free Ag + in solution [18,28,[34][35][36], which will drive both the oxidation of the Ag NPs and the desorption of surface bound Ag + [33].…”

Section: Nanoparticle Dissolutionmentioning

confidence: 99%

“…, again facilitating the conversion of the Ag NPs [33]. Moreover, the presence of natural organic matter in the medium can enhance the NP dissolution by complexing the released Ag + ions [16,34]. All these processes can be summarized with the following chemical equations, where X and L denote a precipitating agent and a complexing organic/inorganic ligand, respectively.…”

Section: Physicochemical Properties and Behavior Of Silver Nanoparticlesmentioning

confidence: 99%

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Transformations of silver nanoparticles in wastewater effluents: links to Ag bioavailability

Azimzada

Tufenkji

Wilkinson

2017

Environ. Sci.: Nano

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As a result of the burgeoning nanotechnology industry, the number of uses of engineered silver nanoparticles (Ag NPs) in consumer products has risen significantly in recent years.Despite their utility as anti-bacterial agents, the 'nano-scale' properties of these materials may lead to eco-toxicological problems when they end up in the environment. Wastewater effluents represent one of the main routes through which Ag NPs can reach an aquatic environment, where they may potentially interact with aquatic life. However, in wastewaters, Ag NPs may undergo different chemical and physical transformations, which may alter the potential toxicity of these NPs towards aquatic organisms. The main objectives of this study are to characterize the Ag NPs in wastewater effluents and then to assess their interactions with a model organism, the green alga Chlamydomonas reinhardtii.Experiments were conducted to distinguish the effect(s) of the wastewater matrix on the dissolution of Ag NPs and to determine whether the transformed NPs or the dissolved Ag species would be most bioavailable to C. reinhardtii. It was shown that in environmental matrices such as wastewater, the bioavailability of Ag + could be significantly or completely reduced-a Nous avons étudié l'effet de la matrice des eaux usées sur la dissolution des Ag NPs et la biodisponibilité des différentes formes (particulaire et dissoute) des Ag NPs pour C. reinhardtii.Dans les matrices environnementales telles que les eaux usées la biodisponibilité de Ag + serait réduite de façon significative, si ce n'est complète; une conclusion qui va à l'encontre les résultats des études similaires faites dans des matrices biologiques simples. Cette réduction

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Section: Methodsmentioning

confidence: 99%

Section: Nanoparticle Dissolutionmentioning

confidence: 99%

Section: Physicochemical Properties and Behavior Of Silver Nanoparticlesmentioning

confidence: 99%

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Transformations of silver nanoparticles in wastewater effluents: links to Ag bioavailability

Azimzada

Tufenkji

Wilkinson

2017

Environ. Sci.: Nano

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“…7 In aerobiosis, the metallic Ag(0) core of AgNPs is covered with surface Ag(I) species, and the dissolution of the NP into ions is favored by pH decrease 8 and/or by some thiol molecules. 9,10 The behavior of AgNPs in the presence of thiol molecules is highly versatile either inducing time-dependent dissolution into ions 9,10 or forming a coating that protects the NP. 8,11 These phenomena depend on the architecture of the molecules and the number of thiols 8,9,11 but have remained unpredictable to date.…”

Section: Introductionmentioning

confidence: 99%

Safer-by-design biocides made of tri-thiol bridged silver nanoparticle assemblies

et al. 2020

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“…[ 70 ] In a separate study, FA was reported not to affect the dissolution process. [ 71 ] In great contrast, overall dissolution of Ag ENMs was significantly reduced by the binding of FA and HA on the ENM surfaces, facilitated by the thiol containing groups. [ 72 ] Moreover, the macromolecules could shift the thermodynamic equilibrium as the thiolate groups in the macromolecules could complex with the released Ag + ions, [ 72 ] resulting in the reformation of the ENMs as observed by Poda et al [ 73 ] Polyacrylamide, polyacrylic acid, and gum arabic coatings were demonstrated to bind to Ag + by forming complexation, and the bound Ag + undergoes reversible adsorption–desorption influenced by Ag + concentration and Na + as a competing cation.…”

Section: The Transformation Of Food Relevant Enms Across Their Life Cmentioning

confidence: 99%

Transformation of Nanomaterials and Its Implications in Gut Nanotoxicology

Setyawati

Zhao

2020

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Ingestion of engineered nanomaterials (ENMs) is inevitable due to their widespread utilization in the agrifood industry. Safety evaluation has become pivotal to identify the consequences on human health of exposure to these ingested ENMs. Much of the current understanding of nanotoxicology in the gastrointestinal tract (GIT) is derived from studies utilizing pristine ENMs. In reality, agrifood ENMs interact with their microenvironment, and undergo multiple physicochemical transformations, such as aggregation/agglomeration, dissolution, speciation change, and surface characteristics alteration, across their life cycle from synthesis to consumption. This work sieves out the implications of ENM transformations on their behavior, stability, and reactivity in food and product matrices and through the GIT, in relation to measured toxicological profiles. In particular, a strong emphasis is given to understand the mechanisms through which these transformations can affect ENM induced gut nanotoxicity.

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Silver nanoparticle dissolution in the presence of ligands and of hydrogen peroxide

Cited by 46 publications

References 34 publications

Transformations of silver nanoparticles in wastewater effluents: links to Ag bioavailability

Transformations of silver nanoparticles in wastewater effluents: links to Ag bioavailability

Safer-by-design biocides made of tri-thiol bridged silver nanoparticle assemblies

Transformation of Nanomaterials and Its Implications in Gut Nanotoxicology

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