Toxic behavior of silver and zinc oxide nanoparticles on environmental microorganisms

Dhas, Sindhu Priya; Shiny, Punalur John; Khan, S. Sudheer; Mukherjee, Amitava; Chandrasekaran, N.

doi:10.1002/jobm.201200316

Cited by 51 publications

(32 citation statements)

References 32 publications

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“…The cultures that showed a long lag were inhibited at higher nanoparticle concentrations. It has been suggested that bacteria probably adapt to the nanoparticles or modify them to make them less toxic during the lag period [31]. Such adaptation by some bacteria could give them a survival advantage and this could lead to disturbance in composition of bacterial populations in soil.…”

Section: Discussionmentioning

confidence: 99%

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Effects of Nanoparticles on Plant Growth-Promoting Bacteria in Indian Agricultural Soil

Chavan

Vigneshwaran

2019

Agronomy

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Soil bacteria are some of the key players affecting plant productivity. Soil today is exposed to emerging contaminants like metal engineered nanoparticles. The objective of this study was to evaluate the toxicological effects of silver and zinc oxide nanoparticles on bacteria classified as plant growth-promoting bacteria. Three types of bacteria-nitrogen fixers, phosphate solubilizers, and biofilm formers-were exposed to engineered nanoparticles. Initially, the effect of silver and zinc oxide nanoparticles was determined on pure cultures of the bacteria. These nanoparticles were then applied to soil to assess changes in composition of bacterial communities. Impacts of the nanoparticles were analyzed using Illumina MiSeq sequencing of 16S rRNA genes. In the soil used, relative abundances of the dominant and agriculturally significant phyla, namely, Proteobacteria, Actinobacteria, and Firmicutes, were altered in the presence of silver nanoparticles. Silver nanoparticles changed the abundance of the three phyla by 25 to 45%. Zinc oxide nanoparticles showed negligible effects at the phylum level. Thus, silver nanoparticles may impact bacterial communities in soil, and this in turn may influence processes carried out by soil bacteria.

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Section: Discussionmentioning

confidence: 99%

“…Few studies have used pure cultures of ecologically important isolates to study the effects of silver and zinc oxide nanoparticles [29][30][31][32][33]. Similar disturbances in soil bacterial communities caused by the same nanoparticles have also been reported [34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 92%

Effects of Nanoparticles on Plant Growth-Promoting Bacteria in Indian Agricultural Soil

Chavan

Vigneshwaran

2019

Agronomy

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“…In soil, TiO 2 NPs inhibited the growth of Bacillus megaterium , Pseudomonas fluorescens , Azotobater vinelandii , and B. brevis ; however ZrO 2 (zirconia) NPs did not show similar effects on these strains . Both Ag and ZnO NPs inhibited the growth of B. subtilis , B. barbaricus , and P. aeruginosa ; however with time, the strains were able to adapt to the toxic effects presumably by causing the NPs to agglomerate into less toxic micro particles, as indicated by dynamic light scattering results showing the particle size increased with time . B. subtilis and P. fluorescens were susceptible to the toxicity of Al 2 O 3 , TiO 2 , ZnO, and SiO 2 NPs; ZnO caused complete mortality in the strains, while Al 2 O 3 , TiO 2 , and SiO 2 NPs resulted in mortality rates of between 40 and 70%, depending on the strain .…”

Section: Effects Of Nanoparticles On the Growth Of Microbes Relevant mentioning

confidence: 99%

Can nanotechnology deliver the promised benefits without negatively impacting soil microbial life?

Dimkpa

2014

J. Basic Microbiol.

120

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Nanotechnology exploits the enhanced reactivity of materials at the atomic scale to improve various applications for humankind. In agriculture, potential nanotechnology applications include crop protection and fertilization. However, such benefits could come with risks for the environment: non-target plants, plant-beneficial soil microbes and other life forms could be impacted if nanoparticles (nanomaterials) contaminate the environment. This review evaluates the impact of the major metallic nanoparticles (Ag, ZnO, CuO, CeO2 , TiO2 , and FeO-based nanoparticles) on soil microbes involved in agricultural processes. The current literature indicate that in addition to population and organismal-scale effects on microbes, other subtle impacts of nanoparticles are seen in the nitrogen cycle, soil enzyme activities, and processes involved in iron metabolism, phytohormone, and antibiotic production. These effects are negative or positive, the outcome being dependent on specific nanoparticles. Collectively, published results suggest that nanotechnology portends considerable, many negative, implications for soil microbes and, thus, agricultural processes that are microbially driven. Nonetheless, the potential of plant and soil microbial processes to mitigate the bioreactivity of nanoparticles also are observed. Whereas the roots of most terrestrial plants are associated with microbes, studies of nanoparticle interactions with plants and microbes are generally conducted separately. The few studies in actual microbe-plant systems found effects of nanoparticles on the functioning of arbuscular mycorrhizal fungi, nitrogen fixation, as well as on the production of microbial siderophores in the plant rhizosphere. It is suggested that a better understanding of the agro-ecological ramifications of nanoparticles would require more in-depth interactive studies in combined plant-microbe-nanoparticle systems.

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“…Zinc in the form of nano zinc-sulphate and nano zinc-methionine in a dose of 80 mg/kg in poultry) was found to improve growth performance, but especially zinc-nano-sulphate decreased growth performance in the broilers (Table 1). The disadvantage of the administration of nano zinc-sulphate is the possibility of contamination of the environment, as the element is transferred by sewage, although in smaller quantities than when conventional zinc forms are used (Dhas, 2014).…”

Section: Efficiency In Animal Productionmentioning

confidence: 99%

Silver and zinc nanoparticles in animal nutrition – a review

Bąkowski

Kiczorowska

Samolińska

et al. 2018

Annals of Animal Science

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The use of metal nanoparticles as supplements of animal diets does not always bring unambiguous results. There are many reports in the literature about the multifaceted effects of this type of supplementation on the animal organism. Therefore, the aim of the paper is to present the current knowledge of the possible application of nanometal forms in animal nutrition and its potential benefits and threats. The positive effect of nanoparticles used as feed additives has most frequently been reflected in an increase in body weight, higher average daily gain, or improvement of the FCR value. In some cases, however, the effect of nanoparticle addition to diets was indiscernible. The potent antibacterial activity of nanoparticles, especially against Gram-negative bacteria and Gram-positive bacteria, is regarded as a positive effect. In turn, the probability of their toxicity is a potential risk in application thereof. Supplementation of diets with nanometals has been accompanied by pathological changes in animal tissues, primarily in the pancreas, kidney, liver, rumen, abomasum, small intestine, adrenal glands, and brain. Additionally, at the the cellular level, nanoparticles were found to induce toxicity, inflammatory excitation, and cell death. Oral administration of nanoparticles induced a risk of malfunction of the nervous system and even impairment of cognitive processes in animals. The increasing knowledge of the possible toxic effects of nanoparticles on the animal organism suggests caution in their use in animal production and necessitates further precise investigations in this area.

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Toxic behavior of silver and zinc oxide nanoparticles on environmental microorganisms

Cited by 51 publications

References 32 publications

Effects of Nanoparticles on Plant Growth-Promoting Bacteria in Indian Agricultural Soil

Effects of Nanoparticles on Plant Growth-Promoting Bacteria in Indian Agricultural Soil

Can nanotechnology deliver the promised benefits without negatively impacting soil microbial life?

Silver and zinc nanoparticles in animal nutrition – a review

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