Influence of pH on the Toxicity of Silver Nanoparticles in the Green Alga Chlamydomonas acidophila

Oukarroum, Abdallah; Samadani, Mahshid; Dewez, David

doi:10.1007/s11270-014-2038-2

Cited by 41 publications

(17 citation statements)

References 35 publications

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“…Toxicity values were greater for 20 nm rather than nanoparticles between 50 and 80 nm [124]. Moreover, using a green alga model (Chlamydomonas acidophila) it has been reported that after 24 h of exposure, the chlorophyll content and cellular viability of the alga decreased significantly and their ROS production increased proportionally to the concentration of AgNPs [125]. Concentration-dependent toxicity has also been observed in zebra fish, causing an increase in mortality rates [126].…”

Section: Toxicity Assessmentmentioning

confidence: 98%

Metal-Based Nanoparticles as Antimicrobial Agents: An Overview

et al. 2020

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Metal-based nanoparticles have been extensively investigated for a set of biomedical applications. According to the World Health Organization, in addition to their reduced size and selectivity for bacteria, metal-based nanoparticles have also proved to be effective against pathogens listed as a priority. Metal-based nanoparticles are known to have non-specific bacterial toxicity mechanisms (they do not bind to a specific receptor in the bacterial cell) which not only makes the development of resistance by bacteria difficult, but also broadens the spectrum of antibacterial activity. As a result, a large majority of metal-based nanoparticles efficacy studies performed so far have shown promising results in both Gram-positive and Gram-negative bacteria. The aim of this review has been a comprehensive discussion of the state of the art on the use of the most relevant types of metal nanoparticles employed as antimicrobial agents. A special emphasis to silver nanoparticles is given, while others (e.g., gold, zinc oxide, copper, and copper oxide nanoparticles) commonly used in antibiotherapy are also reviewed. The novelty of this review relies on the comparative discussion of the different types of metal nanoparticles, their production methods, physicochemical characterization, and pharmacokinetics together with the toxicological risk encountered with the use of different types of nanoparticles as antimicrobial agents. Their added-value in the development of alternative, more effective antibiotics against multi-resistant Gram-negative bacteria has been highlighted.

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Section: Toxicity Assessmentmentioning

confidence: 98%

Metal-Based Nanoparticles as Antimicrobial Agents: An Overview

et al. 2020

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“…In particular, some studies demonstrated that agglomeration of NPs played an important role in determining their cellular toxicity by altering the solubility of NPs [ 15 , 16 ]. Moreover, others studies showed that agglomeration of NPs was dependent to characteristics of the aqueous media such as pH, ionic strength, and concentration of organic compounds [ 17 , 18 ]. Therefore, characterization of NPs properties under different environmental conditions represents useful knowledge in toxicity risk assessment and safety management of NPs.…”

Section: Introductionmentioning

confidence: 99%

Toxicity of Nickel Oxide Nanoparticles on a Freshwater Green Algal Strain ofChlorella vulgaris

Oukarroum

Zaidi

Samadani

et al. 2017

BioMed Research International

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A freshwater microalga strain of Chlorella vulgaris was used to investigate toxic effects induced by nickel oxide nanoparticles (NiO-NPs) in suspension. Algal cells were exposed during 96 h to 0–100 mg L−1 of NiO-NPs and analyzed by flow cytometry. Physicochemical characterization of nanoparticles in tested media showed a soluble fraction (free Ni2+) of only 6.42% for 100 mg L−1 of NiO-NPs, indicating the low solubility capacity of these NPs. Toxicity analysis showed cellular alterations which were related to NiO-NPs concentration, such as inhibition in cell division (relative cell size and granularity), deterioration of the photosynthetic apparatus (chlorophyll synthesis and photochemical reactions of photosynthesis), and oxidative stress (ROS production). The change in cellular viability demonstrated to be a very sensitive biomarker of NiO-NPs toxicity with EC50 of 13.7 mg L−1. Analysis by TEM and X-ray confirmed that NiO-NPs were able to cross biological membranes and to accumulate inside algal cells. Therefore, this study provides a characterization of both physicochemical and toxicological properties of NiO-NPs suspensions in tested media. The use of the freshwater strain of C. vulgaris demonstrated to be a sensitive bioindicator of NiO-NPs toxicity on the viability of green algae.

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“…However, silver ions are highly toxic environmental pollutants 5. The toxicity induced by silver nanoparticles increases due to acid‐induced release of Ag + to solution 6. Many phenomena in fact are related with two or more factors.…”

Section: Methodsmentioning

confidence: 99%

A H⁺/Ag⁺ Dual‐Target Responsive Label‐Free Light‐Up Probe Based on a DNA Triplex

Guo

Wang

et al. 2015

Chemistry An Asian Journal

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We developed a dual-target responsive sensor for label-free light-up fluorescent detection of protons (H(+)) and silver ions (Ag(+)) using an "OR'' logic gate. Berberine, a cost-effective and non-toxic indicator, partially intercalates the formed triplex DNA in the presence of H(+) or Ag(+), generating enhanced fluorescence. The designed Ag(+) probe has high selectivity and desirable sensitivity, which is necessary for practical use. The robust "OR" logic gate is capable of a rapid and reversible response to the H(+) and/or Ag(+) inputs.

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Influence of pH on the Toxicity of Silver Nanoparticles in the Green Alga Chlamydomonas acidophila

Cited by 41 publications

References 35 publications

Metal-Based Nanoparticles as Antimicrobial Agents: An Overview

Metal-Based Nanoparticles as Antimicrobial Agents: An Overview

Toxicity of Nickel Oxide Nanoparticles on a Freshwater Green Algal Strain ofChlorella vulgaris

A H⁺/Ag⁺ Dual‐Target Responsive Label‐Free Light‐Up Probe Based on a DNA Triplex

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Influence of pH on the Toxicity of Silver Nanoparticles in the Green Alga Chlamydomonas acidophila

Cited by 41 publications

References 35 publications

Metal-Based Nanoparticles as Antimicrobial Agents: An Overview

Metal-Based Nanoparticles as Antimicrobial Agents: An Overview

Toxicity of Nickel Oxide Nanoparticles on a Freshwater Green Algal Strain ofChlorella vulgaris

A H+/Ag+ Dual‐Target Responsive Label‐Free Light‐Up Probe Based on a DNA Triplex

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A H⁺/Ag⁺ Dual‐Target Responsive Label‐Free Light‐Up Probe Based on a DNA Triplex