Visible-light reduced silver nanoparticles’ toxicity in Allium cepa test system

Souza, Irisdoris Rodrigues de; Silva, Lucas C. R.; Fernandes, Letícia da Silva Pereira; Salgado, Lilian Dalago; Assis, Helena Cristina Silva de; Firak, Daniele Scheres; Bach, Larissa; Santos-Filho, Ronaldo; Voigt, Carmen Lúcia; Barros, Ariana C.; Peralta‐Zamora, Patricio; Mattoso, N.; Franco, Célia Regina C.; Medeiros, Lia Carolina Soares; Marcon, Bruna Hilzendeger; Cestari, Marta Margarete; Sant’Anna-Santos, Bruno Francisco; Leme, Daniela Morais

doi:10.1016/j.envpol.2019.113551

Cited by 25 publications

(12 citation statements)

References 67 publications

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“…Indirectly, release of Ag + ions from AgNPs [ 38 , 77 , 132 , 133 ] and properties of their coatings [ 68 , 133 , 134 ] affect AgNP toxicity and additionally contribute to ROS production in promotion of oxidative stress. To elucidate if the extent of oxidative stress is related to AgNP stabilization by coating application, Souza et al [ 135 ] have compared toxicity effects of uncoated and PVP-coated AgNPs on A. cepa. Results have demonstrated higher ROS production and more detrimental effects after treatment with uncoated when compared to PVP-coated AgNPs.…”

Section: Oxidative Stress Induction and Mobilization Of Antioxidant Machinerymentioning

confidence: 99%

Surface Coating-Modulated Phytotoxic Responses of Silver Nanoparticles in Plants and Freshwater Green Algae

et al. 2021

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Silver nanoparticles (AgNPs) have been implemented in a wide range of commercial products, resulting in their unregulated release into aquatic as well as terrestrial systems. This raises concerns over their impending environmental effects. Once released into the environment, they are prone to various transformation processes that modify their reactivity. In order to increase AgNP stability, different stabilizing coatings are applied during their synthesis. However, coating agents determine particle size and shape and influence their solubility, reactivity, and overall stability as well as their behavior and transformations in the biological medium. In this review, we attempt to give an overview on how the employment of different stabilizing coatings can modulate AgNP-induced phytotoxicity with respect to growth, physiology, and gene and protein expression in terrestrial and aquatic plants and freshwater algae.

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Section: Oxidative Stress Induction and Mobilization Of Antioxidant Machinerymentioning

confidence: 99%

Surface Coating-Modulated Phytotoxic Responses of Silver Nanoparticles in Plants and Freshwater Green Algae

et al. 2021

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“…After uptake and accumulation, metal-containing NPs can interact with plants at the cellular and subcellular levels, facilitating changes to morphological and physiological states, which may be suppressive or stimulatory [2]. For instance, Ag NPs caused oxidative stress and exhibited toxicity when applied in higher concentrations to Allium cepa roots, regardless of surface coating used [16]. An increase of peroxidase, catalase, superoxide, dismutase activity, and inhibition in plant growth has been detected in Lemna minor after copper oxide nanoparticles (CuO NPs) treatment [17].…”

Section: Introductionmentioning

confidence: 99%

To-Do and Not-To-Do in Model Studies of the Uptake, Fate and Metabolism of Metal-Containing Nanoparticles in Plants

et al. 2020

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Due to the increasing release of metal-containing nanoparticles into the environment, the investigation of their interactions with plants has become a hot topic for many research fields. However, the obtention of reliable data requires a careful design of experimental model studies. The behavior of nanoparticles has to be comprehensively investigated; their stability in growth media, bioaccumulation and characterization of their physicochemical forms taken-up by plants, identification of the species created following their dissolution/oxidation, and finally, their localization within plant tissues. On the basis of their strong expertise, the authors present guidelines for studies of interactions between metal-containing nanoparticles and plants.

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“…), concentration, and the combination with distinct materials (species, age, cell types, etc.) and the experimental conditions such as duration and method of exposure of AgNPs (Becaro et al, 2017; Panda et al, 2011; Scherer et al, 2019; Souza et al, 2020).…”

Section: Resultsmentioning

confidence: 99%

Cyto–genotoxicity, antibacterial, and antibiofilm properties of green synthesized silver nanoparticles using Penicillium toxicarium

Korcan

Kahraman

Açıkbaş

et al. 2021

Microscopy Res & Technique

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The fungi are becoming the distinguished organisms utilized in the biological synthesis of metallic nanoparticles because of their metal bioaccumulation ability. Addressed herein, the extracellular synthesis of silver nanoparticles (AgNPs) was carried out by using the cell‐free filtrate of Penicillium toxicarium KJ173540.1. P. toxicarium was locally isolated and identified using both classical and molecular methods according to ribosomal internal transcribed spacer area of 18S rDNA. The optimum conditions for the AgNPs synthesis were found as 0.25 mM AgNO3 concentrations with pH 12 values at 45°C after 64 hr incubation in dark. Biosynthesized AgNPs were characterized via microscopic and spectroscopic techniques such as transmission electron microscopy, scanning electron microscopy, energy dispersive X‐ray analysis, Fourier transform infrared spectrophotometer, and ultraviolet–visible spectroscopy. Zetasizer measurements presented that the high negative potential value (−18.1 mV) and PDI (0.495) supported the excellent colloidal nature of AgNPs with long‐range stability and high dispersity. AgNPs exhibited cyto–genotoxicity in Allium cepa root meristem cells by decreasing mitotic index and increasing chromosome aberrations in a dose‐dependent manner. Then, 100 and 50% concentration of biosynthesized AgNPs showed antibacterial activity on Staphylococcus aureus and Bacillus subtilis. A decreasing biofilm formation of Pseudomonas aeruginosa 80.69, 48.32, and 28.41% was also observed at 100, 50, and 25% of mycosynthesized AgNP, respectively.

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Visible-light reduced silver nanoparticles’ toxicity in Allium cepa test system

Cited by 25 publications

References 67 publications

Surface Coating-Modulated Phytotoxic Responses of Silver Nanoparticles in Plants and Freshwater Green Algae

Surface Coating-Modulated Phytotoxic Responses of Silver Nanoparticles in Plants and Freshwater Green Algae

To-Do and Not-To-Do in Model Studies of the Uptake, Fate and Metabolism of Metal-Containing Nanoparticles in Plants

Cyto–genotoxicity, antibacterial, and antibiofilm properties of green synthesized silver nanoparticles using Penicillium toxicarium

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