Impact of polymer-coated silver nanoparticles on marine microbial communities: A microcosm study

Doiron, Kim; Pelletier, Émilien; Lemarchand, Karine

doi:10.1016/j.aquatox.2012.07.004

Cited by 48 publications

(29 citation statements)

References 44 publications

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“…59 Another hypothesis suggests that the NPs will be oxidized, dissolve, and generate reactive oxygen species, which will, in turn, enter the cytoplasm, causing bacterial death. [60][61][62] Moreover, small-sized nanoparticles may accumulate intracellularly and lead to cell malfunction. 63 Our results showed varying responses of different microbial micro-organisms as affected by the prepared AgNPs.…”

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confidence: 99%

Facile method for the synthesis of silver nanoparticles using 3-hydrazino-isatin derivatives in aqueous methanol and their antibacterial activity

El‐Faham¹,

Elzatahry²,

ALOthman³

et al. 2014

IJN

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Introduction A new method for preparation of silver nanoparticles (AgNPs) based on using hydrazino-isatin derivatives in an aqueous methanol reaction medium is reported here. AgNPs were prepared using silver nitrate solubilized in a water core as the source of silver ions and 3-hydrazino-isatin derivatives (3-hydrazino-isatin [IsH] and 1-benzyl-3-hydrazino-isatin [BIsH]) solubilized in methanol core as a reducing agent. The proposed method is effective, rapid, and convenient. X-ray diffraction (XRD), energy dispersive X-ray analysis, scanning electron microscope (SEM) and transmission electron microscopy (TEM) were used for characterization of the AgNPs. The TEM micrographs confirmed that the nanopowders consist of well-dispersed agglomerates of grains with a narrow size distribution of 18–21 nm and 17–20 nm. The AgNPs, as well as BIsH, showed high antimicrobial and bactericidal activity against the Gram-positive Bacillus subtilis and Gram-negative Micrococcus luteus and Proteus vulgaris , as well as antifungal activities against Saccharomyces cerevisiae . On the other hand, they were not effective against the Gram-negative Escherichia coli . Purpose A simple, effective, rapid, and convenient chemical reduction method for the synthesis of AgNPs in an aqueous methanol reaction medium using hydrazino-isatin derivatives and studying their antibacterial effect. Results IsH and BIsH are remarkably powerful reductants for Ag+ ions in an aqueous methanol medium, which could be considered as a simple chemical reduction method for formation of AgNPs. The AgNP formation depends on the solubility of the hydrazino-isatin derivatives. BIsH gave more AgNPs than IsH, as observed from XRD. The formation of AgNPs is attributed to the adsorption of hydrazine derivatives and/or interparticle interaction on the surface of AgNP through electrostatic interactions between the lone pair electrons of the hydrazino group (C=N-NH 2 ) and the positive surface of AgNPs. AgNPs and BIsH showed high antimicrobial and bacterial activity. Conclusion In summary, it is shown that IsH and BIsH are remarkably powerful reductants for Ag+ ions in an aqueous methanol medium. BIsH gave more AgNPs than IsH, as observed from XRD due to better solubility of the BIsH than IsH in aqueous-methanol. The formation of AgNPs is attributed to the adsorption of hydrazine derivatives and/or interparticle interaction on the surface of AgNPs through electrostatic interactions between the lone pair electrons of the hydrazino group (C=N-NH 2 ) and the positive surface of AgNPs. The AgNps as well as BIsH ligand showed high antimicrobial and bactericidal activity.

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confidence: 99%

Facile method for the synthesis of silver nanoparticles using 3-hydrazino-isatin derivatives in aqueous methanol and their antibacterial activity

El‐Faham¹,

Elzatahry²,

ALOthman³

et al. 2014

IJN

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“…This effect on the bacterial community diversity has also been observed by Doiron et al (2012), who reported on changes in marine bacterial richness in marine microcosms exposed to polymer-coated Ag-NPs and ionic silver. Other studies observed no (Bradford, 2009) or reduced effects (Colman 2012) in laboratory Ag-NP exposure experiments on stream water and sediment samples.…”

Section: Effects Of Ag-nps On the Microbial Communitymentioning

confidence: 52%

Potential risks and benefits of nanotechnology: perceptions of risk in sunscreens

Wright

2016

Medical Journal of Australia

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“…This relative stimulation by TiO2NP could be based on the removal of competitors from the community; however studies investigating the effects of TiO2NP exposure on bacterial community composition are necessary to understand these mechanisms. Changes in bacterial community structure when exposed to AgNP have been previously reported (Das et al 2012, Doiron et al 2012. A reduction in abundance and number of Operational Taxonomic…”

Section: Discussionmentioning

confidence: 99%

“…Units in a marine bacterial community following AgNP exposure was described by Doiron et al (2012). Das and co-workers observed AgNP intolerant, -recovering, -tolerant and -stimulated bacterial groups in their experiment (Das et al 2012).…”

Section: Discussionmentioning

confidence: 99%

Impact of TiO2 nanoparticles on freshwater bacteria from three Swedish lakes

Farkas

Peter

Ciesielski

et al. 2015

Science of The Total Environment

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Due to the rapidly rising production and usage of nano-enabled products, aquatic environments are increasingly exposed to engineered nanoparticles, causing concerns about their potential negative effects. In this study we assessed the effects of uncoated titanium dioxide nanoparticles No UV-induced phototoxic effect of TiO2NP was found in this study. We conclude that in freshwater lakes with high DOC and low chemical element concentrations, uncoated TiO2NPshow an enhanced stability and can significantly reduce bacterial abundance at relatively low exposure concentrations.

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Impact of polymer-coated silver nanoparticles on marine microbial communities: A microcosm study

Cited by 48 publications

References 44 publications

Facile method for the synthesis of silver nanoparticles using 3-hydrazino-isatin derivatives in aqueous methanol and their antibacterial activity

Facile method for the synthesis of silver nanoparticles using 3-hydrazino-isatin derivatives in aqueous methanol and their antibacterial activity

Potential risks and benefits of nanotechnology: perceptions of risk in sunscreens

Impact of TiO2 nanoparticles on freshwater bacteria from three Swedish lakes

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