Influence of Suwannee River humic acid on particle properties and toxicity of silver nanoparticles

Gao, Jie; Powers, Kevin; Wang, Yu; Zhou, Haoyan; Roberts, Stephen M.; Moudgil, Brij M.; Koopman, Ben; Barber, David S.

doi:10.1016/j.chemosphere.2012.04.024

Cited by 147 publications

(97 citation statements)

References 35 publications

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“…This DOM is constituted mostly of aromatic and aliphatic hydrocarbon structure that exhibit amide, carboxyl, hydroxyl, ketones and various minor functions [129]. In an optic of standardization, most studies internationally are performed using DOM (or purified humic acid or fulvic acid fractions) obtained from the Suwannee River [130][131][132]. These fractions have been shown to adsorb at the surface of nanoparticles, causing their aggregation [130,133] and limiting their Ag + release [97].…”

Section: Fate Of Silver Nanoparticles In the Environmentmentioning

confidence: 99%

“…In an optic of standardization, most studies internationally are performed using DOM (or purified humic acid or fulvic acid fractions) obtained from the Suwannee River [130][131][132]. These fractions have been shown to adsorb at the surface of nanoparticles, causing their aggregation [130,133] and limiting their Ag + release [97]. Humic acid has also the capability to immobilize Ag + ions and is a mild reducer, leading to the formation of new Ag NPs after dissolution of the original ones [134][135][136], with influences on the Ag + release dynamics.…”

Section: Fate Of Silver Nanoparticles In the Environmentmentioning

confidence: 99%

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Antibacterial activity of silver nanoparticles: A surface science insight

2015

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Summary Silver nanoparticles constitute a very promising approach for the development of new antimicrobial systems. Nanoparticulate objects can bring significant improvements in the antibacterial activity of this element, through specific effect such as an adsorption at bacterial surfaces. However, the mechanism of action is essentially driven by the oxidative dissolution of the nanoparticles, as indicated by recent direct observations. The role of Ag + release in the action mechanism was also indirectly observed in numerous studies, and explains the sensitivity of the antimicrobial activity to the presence of some chemical species, notably halides and sulfides which form insoluble salts with Ag + . As such, surface properties of Ag nanoparticles have a crucial impact on their potency, as they influence both physical (aggregation, affinity for bacterial membrane, etc.) and chemical (dissolution, passivation, etc.) phenomena. Here, we review the main parameters that will affect the surface state of Ag NPs and their influence on antimicrobial efficacy. We also provide an analysis of several works on Ag NPs activity, observed through the scope of an oxidative Ag + release.

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Section: Fate Of Silver Nanoparticles In the Environmentmentioning

confidence: 99%

Section: Fate Of Silver Nanoparticles In the Environmentmentioning

confidence: 99%

Antibacterial activity of silver nanoparticles: A surface science insight

2015

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“…Humic acid. Since NPs can be stabilized by interaction with the dissolved organic matter such as humic acid that is common in the environmental waters, 38,39 it is essential to investigate the potential effects of humic acid on the extraction efficiency. As shown in Fig.…”

Section: Extraction Timementioning

confidence: 99%

Speciation analysis of silver sulfide nanoparticles in environmental waters by magnetic solid-phase extraction coupled with ICP-MS

Zhou

Liu

Yuan

et al. 2016

J. Anal. At. Spectrom.

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The growing production and widespread application of silver nanoparticles (AgNPs) have led to their release into the environment, where they are mostly transformed to silver sulfide nanoparticles (Ag 2 S NPs). Thus, speciation analysis of Ag 2 S NPs in environmental matrices is essential for understanding the environmental process and toxic effects of AgNPs. Herein, we report the use of aged iron oxide magnetic particles (IOMPs) as magnetic solid-phase extraction adsorbents for speciation analysis of Ag 2 S NPs. It was found that IOMPs are excellent adsorbents for the selective extraction of silver-containing nanoparticles (AgCNPs) including Ag 2 S NPs, AgNPs and AgCl NPs in the presence of Ag + . More importantly, Ag 2 S NPs can be distinguished from the other AgCNPs by sequential elution. After preeluting AgNPs and AgCl NPs as Ag + with 2% (v/v) acetic acid and IOMPs as the sacrificial oxidants, Ag 2 S NPs were completely eluted as a Ag(I) complex by 10 mM thiourea in 2% (v/v) acetic acid and quantified directly by inductively coupled plasma mass spectrometry (ICP-MS). While the extraction of Ag + was negligible, the maximum extraction of AgCNPs by IOMPs was attained at pH 4.9-6.2, and the interference of humic acid in the AgCNP extraction can be efficiently eliminated by adding Ca 2+ . Under optimized conditions, the method provides low detection limit (0.068 mg L À1 ) and high reproducibility (relative standard deviations < 5.1%) for Ag 2 S NPs. By simultaneously spiking 0.16-10.3 mg L À1 AgNPs and 0.53-14.8 mg L À1 Ag 2 S NPs, the Ag 2 S NP recoveries were in the range of 69.6-100.2% for the tap, river and lake waters; and in the range of 106.2-149.9% for the WWTP effluent due to the part sulfidation of AgNPs to Ag 2 S NPs. Our method is valid for the speciation analysis of Ag 2 S NPs in water samples, which provides an efficient approach for studying the sulfidation of AgNPs and Ag + .

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“…There are clear indications that the presence of humic acid-like components in the surface coating by EPS limits the bioavailability of nanoparticles and attenuates their toxicity. Gao et al (2012) showed that by increasing the humic acids concentration in a surface coating, the toxicity of silver nanoparticles to Daphina magna was decreased. Moreover, the presence of humic acids inhibits the generation of intracellular reactive oxygen species (ROS) and cellular lipid peroxidation which could be responsible for the lower toxicity of nanoparticles coated with natural organic matter (Lin et al, 2012;Yin et al, 2010).…”

Section: Effect Of Eps On Nano-se Toxicitymentioning

confidence: 99%

“…Several studies have shown that organic matter, i.e. EPS and humic substances, influence the fate (size, shape or surface charge) and toxicity of engineered nanoparticles like Ag, TiO 2 , ZnS by limiting their dissolution and bioavailability (uptake) (Bondarenko et al, 2016;Gao et al, 2012;Lin et al, 2012;Moreau et al, 2007). But it is unclear whether NOM or EPS of biofilms associate with elemental selenium and influence the nano-Se bioavailability and toxicity.…”

Section: Introductionmentioning

confidence: 99%