Effect of silver nano-particles on soil microbial growth, activity and community diversity in a sandy loam soil

Samarajeewa, A.D.; Velicogna, Jessica R.; Princz, Juliska; Subasinghe, R.M.; Scroggins, Richard P.; Beaudette, Lee A.

doi:10.1016/j.envpol.2016.09.094

Cited by 128 publications

(71 citation statements)

References 75 publications

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“…Here, the toxicity of the silver species increased predominantly with increasing concentrations (Additional file 1: Fig. S2), which was already observed in a variety of recent soil studies [5,24,86,87].…”

Section: Concentrationsupporting

confidence: 74%

“…Apart from that, we recently recognized a tolerance of amoA harboring bacteria after short-term exposure to AgNP [16]. Furthermore, Schlich et al [77] and Samarajeewa et al [86] observed stimulatory effects with ionic and nanoparticulate silver to ammonia-oxidizing bacteria, which could be ascribed to hormone-like responses to low silver concentrations. By contrast, the stimulation of Bacteroidetes due to silver addition was in agreement with previous observations [52,69,70,97,98].…”

Section: Exposure Timementioning

confidence: 90%

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Impact of silver nanoparticles (AgNP) on soil microbial community depending on functionalization, concentration, exposure time, and soil texture

et al. 2019

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Background: Increasing exposure to engineered inorganic nanoparticles takes actually place in both terrestric and aquatic ecosystems worldwide. Although we already know harmful effects of AgNP on the soil bacterial community, information about the impact of the factors functionalization, concentration, exposure time, and soil texture on the AgNP effect expression are still rare. Hence, in this study, three soils of different grain size were exposed for up to 90 days to bare and functionalized AgNP in concentrations ranging from 0.01 to 1.00 mg/kg soil dry weight. Effects on soil microbial community were quantified by various biological parameters, including 16S rRNA gene, photometric, and fluorescence analyses.Results: Multivariate data analysis revealed significant effects of AgNP exposure for all factors and factor combinations investigated. Analysis of individual factors (silver species, concentration, exposure time, soil texture) in the unifactorial ANOVA explained the largest part of the variance compared to the error variance. In depth analysis of factor combinations revealed even better explanation of variance. For the biological parameters assessed in this study, the matching of soil texture and silver species, and the matching of soil texture and exposure time were the two most relevant factor combinations. The factor AgNP concentration contributed to a lower extent to the effect expression compared to silver species, exposure time and physico-chemical composition of soil. Conclusions:The factors functionalization, concentration, exposure time, and soil texture significantly impacted the effect expression of AgNP on the soil microbial community. Especially long-term exposure scenarios are strongly needed for the reliable environmental impact assessment of AgNP exposure in various soil types. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Section: Concentrationsupporting

confidence: 74%

Section: Exposure Timementioning

confidence: 90%

Impact of silver nanoparticles (AgNP) on soil microbial community depending on functionalization, concentration, exposure time, and soil texture

et al. 2019

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“…In soil ecosystem, Samarajeewa et al, (2017) observed a negatively effect on microbial growth and activity in soil containing AgNPs in the concentration of 49 mg kg -1 and Ag tolerant bacteria was detected. However, the specie Pelobacter propionicus which has a function in carbon and nitrogen cycles was found to be sensitive to exposure to AgNPs in estuarine sediments (Antizar-Ladislao, 2015).…”

Section: Resultsmentioning

confidence: 94%

“…However, few studies report the impact of materials containing metal in the soil microbiota at the end of their lifecycle (Bao et al, 2016;Samarajeewa et al, 2017;McGee et al, 2017). In this context, investigations addressing the impact of metal ions and nanoparticles on the soil microbial populations are required.…”

Section: Introductionmentioning

confidence: 99%

Silver effect on the biodegradation process of styrene-ethylene/butylene-styrene based thermoplastic elastomers compounds upon weathering exposure

Tomacheski¹,

Pittol²,

Vier³

et al. 2018

Ecotoxicol. Environ. Contam.

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The incorporation of antibacterial additives in polymeric materials has become common to reduce the colonization of microorganisms in daily household items. This kind of product can be helpful to prevent diseases, but following the end of its useful lifetime, it might become an environmental problem, causing hazards also to the beneficial soil-borne microbes. This study aims to evaluate the effect of thermoplastic elastomers (TPEs) compounds loaded with silver ions (Ag + _bentonite, Ag + _phosphate) and nanoparticles (AgNp_silica) in the soil microbiota. Samples were exposed to weathering for 3, 6, 9 and 12 months, and monitored by carbon dioxide (CO 2 ) production in the soil for 4 months. Standard sample exposed to weather by 6, 9 and 12 months showed higher CO 2 production than samples unexposed or exposed for 3 months. By contrast, silver-loaded samples had higher CO 2 production in samples pre-aged for 3 months, but the values decreased in samples pre-aged for 6, 9 and 12 months. Moreover, soil microbial counts were lower in samples that had lower CO 2 production. Though the amount of silver in the soil has been lower than the limit of detection, after intense exposure to weather, the degradation of the polymer may have facilitated the release of silver from the TPE matrix, and on these terms, silver may have caused a harmful effect on soil fungi and bacterial population.

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“…Plates without silver nanoparticles were used as negative control. We counted microorganisms growing on plates as colonies following Ki-Young et al (2007) and Samarajeewa et al (2017).…”

Section: Methodsmentioning

confidence: 99%

Antibacterial Effect of Different Concentrations of Silver Nanoparticles

Borum¹

2018

PVJ

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Silver has been in use since time immemorial in the form of metallic silver, silver nitrate, silver sulfadiazine for the treatment of burns, wounds and several bacterial infections. Silver has long been known to show a strong antimicrobial effect to microorganisms. The antimicrobial effect of 30 and 100 ppm silver nanoparticles were investigated against Escherichia coli, Staphylococcus aureus, Salmonella typhimurium, Enterococcus faecalis, Bacillus cereus, Bacillus subtilis, Paenibacillus larvae, Candida albicans and Aspergillus niger. The microorganisms were diluted with sterile distilled water and prepared dilutions of 10 6 of test microorganisms. Dilutions of microorganisms cultured to blood agar base and incubated at 37°C for 24 hours. One mL dilution of 10 6 of all of microorganisms was centrifuged at 3500 rpm for 20 minutes then 30 and 100 ppm of silver nanoparticle solutions were added. Samples were inoculated in blood agar for different time intervals i.e., 0, 2, 5, 10, 30, 60 minutes and 24 hour. Antibacterial activity of silver nanoparticles against various microorganisms was detected at 0, 2, 5, 10, 30, 60 minutes and 24 hours. As results, yeast, fungi and bacteria were inhibited at 30 and 100 ppm. But, P. larvae were not inhibited, while B. subtilis also could not be inhibited at 30 ppm. The antibacterial activity of 100 ppm was stronger than the antibacterial activity of 30 ppm of nanoparticles. Nanosilver is very effective to important pathogens.

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Effect of silver nano-particles on soil microbial growth, activity and community diversity in a sandy loam soil

Cited by 128 publications

References 75 publications

Impact of silver nanoparticles (AgNP) on soil microbial community depending on functionalization, concentration, exposure time, and soil texture

Impact of silver nanoparticles (AgNP) on soil microbial community depending on functionalization, concentration, exposure time, and soil texture

Silver effect on the biodegradation process of styrene-ethylene/butylene-styrene based thermoplastic elastomers compounds upon weathering exposure

Antibacterial Effect of Different Concentrations of Silver Nanoparticles

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