Toxicity of zinc oxide and iron oxide engineered nanoparticles to <i>Bacillus subtilis</i> in river water systems

Leareng, Samuel K.; Ubomba-Jaswa, Eunice; Musee, N

doi:10.1039/c9en00585d

Cited by 31 publications

(23 citation statements)

References 79 publications

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“…[226] effects of two natural South African river water samples (Elands River (ER) and Bloubank River (BR)) on the toxicity of ENMs have been compared. [193] The results showed that high concentrations of ZnO NPs (100 and 1000 µg L −1 ) induced a significant reduction in the membrane integrity of Bacillus subtilis in ER, being absent for BR. They also found that γ-nFe 2 O 3 NPs showed no difference in both water samples, indicating that the unique physicochemical properties and substances of natural aqueous media may have distinct corona compositions on different ENMs, generating different outcomes.…”

Section: Magna Secreted Protein Cooh-ps Nps Nh 2 -Ps Npsmentioning

confidence: 94%

The Crucial Role of Environmental Coronas in Determining the Biological Effects of Engineered Nanomaterials

Wang

et al. 2020

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In aquatic environments, a large number of ecological macromolecules (e.g., natural organic matter (NOM), extracellular polymeric substances (EPS), and proteins) can adsorb onto the surface of engineered nanomaterials (ENMs) to form a unique environmental corona. The presence of environmental corona as an eco–nano interface can significantly alter the bioavailability, biocompatibility, and toxicity of pristine ENMs to aquatic organisms. However, as an emerging field, research on the impact of the environmental corona on the fate and behavior of ENMs in aquatic environments is still in its infancy. To promote a deeper understanding of its importance in driving or moderating ENM toxicity, this study systemically recapitulates the literature of representative types of macromolecules that are adsorbed onto ENMs; these constitute the environmental corona, including NOM, EPS, proteins, and surfactants. Next, the ecotoxicological effects of environmental corona‐coated ENMs on representative aquatic organisms at different trophic levels are discussed in comparison to pristine ENMs, based on the reported studies. According to this analysis, molecular mechanisms triggered by pristine and environmental corona‐coated ENMs are compared, including membrane adhesion, membrane damage, cellular internalization, oxidative stress, immunotoxicity, genotoxicity, and reproductive toxicity. Finally, current knowledge gaps and challenges in this field are discussed from the ecotoxicology perspective.

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Section: Magna Secreted Protein Cooh-ps Nps Nh 2 -Ps Npsmentioning

confidence: 94%

The Crucial Role of Environmental Coronas in Determining the Biological Effects of Engineered Nanomaterials

Wang

et al. 2020

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“…The cell concentration was measured by counting the number of colony-forming units (CFUs) from the appropriate dilution on nutrient agar plates as previously described. 50 The viability of cells cultured with Fe NPs could also be evaluated by comparing it with control. 50 The experiments were conducted in triplicate.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…50 The viability of cells cultured with Fe NPs could also be evaluated by comparing it with control. 50 The experiments were conducted in triplicate.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Fe Nanoparticles Enhanced Surfactin Production in Bacillus amyloliquefaciens

Yang

2020

ACS Omega

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Surfactin, as one of the most powerful biosurfactants, can be widely applied in agriculture, food, and pharmaceutics. However, low biosynthesis efficiency is the major obstacle in its commercialization. Here, we used nanoparticles to increase the surfactin production in Bacillus amyloliquefaciens MT45 through enhancing the secretion (the key step of surfactin biosynthesis). The results showed that the surfactin titer increased from 4.93 to 7.15 g/L in the flask and from 5.94 to 9.18 g/L in a 7 L bioreactor by adding 5 g/L Fe nanoparticles. They were the highest titers in the reported wild-type strain. Our results indicated that Fe nanoparticles enhanced the expression of genes involved in the biosynthesis of surfactin. Moreover, Fe nanoparticles increased the permeability of cell membranes, resulting in a more efficient secretion of surfactin. This study provides an efficient strategy for increasing the biosynthesis of microbial metabolites and provides new insights into the nanoparticles’ impacts on microbes.

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“…In agriculture, research is in progress on the application of the antifungal properties of ZnO NPs to protect crops [ 307 , 310 ]. ZnO NPs are used in a broad range of commercial applications, thus it is important to understand their fate and behaviour in soil, water, their manner of absorption and spreading/accumulation in plants, animals and microorganisms, but also interactions with impurities [ 311 , 312 , 313 , 314 , 315 , 316 , 317 , 318 , 319 , 320 , 321 , 322 , 323 , 324 , 325 , 326 , 327 , 328 , 329 , 330 , 331 , 332 , 333 , 334 ]. It must be borne in mind that the dynamically increasing the commercial application of ZnO NPs without appropriate supervision and tests may contribute to their adverse impact on land and water plants and animals [ 335 , 336 ].…”

Section: Introductionmentioning

confidence: 99%

A Review of Microwave Synthesis of Zinc Oxide Nanomaterials: Reactants, Process Parameters and Morphologies

2020

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Zinc oxide (ZnO) is a multifunctional material due to its exceptional physicochemical properties and broad usefulness. The special properties resulting from the reduction of the material size from the macro scale to the nano scale has made the application of ZnO nanomaterials (ZnO NMs) more popular in numerous consumer products. In recent years, particular attention has been drawn to the development of various methods of ZnO NMs synthesis, which above all meet the requirements of the green chemistry approach. The application of the microwave heating technology when obtaining ZnO NMs enables the development of new methods of syntheses, which are characterised by, among others, the possibility to control the properties, repeatability, reproducibility, short synthesis duration, low price, purity, and fulfilment of the eco-friendly approach criterion. The dynamic development of materials engineering is the reason why it is necessary to obtain ZnO NMs with strictly defined properties. The present review aims to discuss the state of the art regarding the microwave synthesis of undoped and doped ZnO NMs. The first part of the review presents the properties of ZnO and new applications of ZnO NMs. Subsequently, the properties of microwave heating are discussed and compared with conventional heating and areas of application are presented. The final part of the paper presents reactants, parameters of processes, and the morphology of products, with a division of the microwave synthesis of ZnO NMs into three primary groups, namely hydrothermal, solvothermal, and hybrid methods.

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Toxicity of zinc oxide and iron oxide engineered nanoparticles to Bacillus subtilis in river water systems

Abstract: Zinc oxide (nZnO) and iron oxide (nFeOx) engineered nanoparticles (ENPs) are widely used in consumer products and industrial applications, and consequently, are continuously being released into the environment.

Cited by 31 publications

References 79 publications

The Crucial Role of Environmental Coronas in Determining the Biological Effects of Engineered Nanomaterials

The Crucial Role of Environmental Coronas in Determining the Biological Effects of Engineered Nanomaterials

Fe Nanoparticles Enhanced Surfactin Production in Bacillus amyloliquefaciens

A Review of Microwave Synthesis of Zinc Oxide Nanomaterials: Reactants, Process Parameters and Morphologies

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