Interaction and nanotoxic effect of ZnO and Ag nanoparticles on mesophilic and halophilic bacterial cells

Sinha, Rajeshwari; Karan, Ram; Sinha, Arvind; Khare, Sunil Kumar

doi:10.1016/j.biortech.2010.07.117

Cited by 203 publications

(91 citation statements)

References 17 publications

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“…[55,56] More activity towards gram-negative bacteria may be because the cell wall of gram-positive bacteria has more peptidoglycan than gram-negative bacteria cell wall, which is negatively charged, and more ZnO, Fe and Mn ions may get trapped to peptidoglycan in gram-positive bacteria. [57] Whereas in case of gram-negative bacteria there are electrostatic interactions between NPs and cell surface followed by cell morphological changes, increase in cell permeability and their accumulation in the cytoplasm. [58] MIC followed the same pattern as antimicrobial activity.…”

Section: Minimum Inhibitory Concentration (Mic)mentioning

confidence: 99%

Synthesis, characterisation and antimicrobial activity of manganese- and iron-doped zinc oxide nanoparticles

Sharma

Jandaik

Kumar

et al. 2015

Journal of Experimental Nanoscience

106

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The present work reports study on antimicrobial activity of pure and doped ZnO nanocomposites. Polyvinyl pyrrolidone capped Mn-and Fe-doped ZnO nanocomposites were synthesised using simple chemical co-precipitation technique. The synthesised materials were characterised using transmission electron microscope (TEM), X-ray powder diffraction (XRD), energy dispersive X-ray fluorescence (EDXRF), Fourier transform infrared (FTIR) spectroscopy and ultraviolet (UV) visible spectroscopy. The XRD and TEM studies reveal that the synthesised ZnO nanocrystals have a hexagonal wurtzite structure with average crystalline size »7À14 nm. EDXRF and FTIR study confirmed the doping and the incorporation of impurity in ZnO nanostructure. The antimicrobial activities of nanoparticles (NPs) were studied against fungi, grampositive and gram-negative bacteria using the standard disc diffusion method. The photocatalytic activities of prepared NPs were evaluated by degradation of methylene blue dye in aqueous solution under UV light irradiation. Experimental results demonstrated that ZnO NPs doped with 10% of Mn and Fe ions showed maximum antimicrobial and photodegradation efficiency in contrast with that of the 1% loading. The enhancement in antimicrobial effect and photocatalytic degradation is attributed to the generation of reactive oxygen species due to the synergistic effects of Mn and Fe loading.

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Section: Minimum Inhibitory Concentration (Mic)mentioning

confidence: 99%

Synthesis, characterisation and antimicrobial activity of manganese- and iron-doped zinc oxide nanoparticles

Sharma

Jandaik

Kumar

et al. 2015

Journal of Experimental Nanoscience

106

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“…Li et al (2011) studied the antibacterial activity of ZnO NPs on bacterial cells and found that Gram-negative bacteria (Pseudomonas putida and E. coli) are more resistant than Gram-positive bacteria (Bacillus subtilis). On the other hand, Sinha et al (2011) investigated the toxic effect of silver and zinc oxide nanoparticle on mesophilic and halophilic bacterial cells and concluded that Gram-positive halophiles were able to withstand the toxicity better than their Gram-negative counterparts. Choudhury and Srivastava (2001) compared the data of microorganisms resisting/combating high Zn by extracellular accumulation or intracellular sequestration by metallothioneins (MT) and efflux by Zn-effluxing ATPases (P-type ATPases) such as ZiaA in Synechocystis and ZntA in E. coli.…”

Section: Introductionmentioning

confidence: 99%

Resistance of extremely halophilic archaea to zinc and zinc oxide nanoparticles

2015

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Industrialization as well as other anthropogenic activities have resulted in addition of high loads of metal and/or metal nanoparticles to the environment. In this study, the effect of one of the widely used heavy metal, zinc (Zn) and zinc oxide nanoparticles (ZnO NPs) on extremely halophilic archaea was evaluated. One representative member from four genera namely Halococcus, Haloferax, Halorubrum and Haloarcula of the family Halobacteriaceae was taken as the model organism. All the haloarchaeal genera investigated were resistant to both ZnCl 2 and ZnO NPs at varying concentrations. Halococcus strain BK6 and Haloferax strain BBK2 showed the highest resistance in complex/minimal medium of up to 2.0/1.0 mM ZnCl 2 and 2.0/1.0-0.5 mM ZnO NP. Accumulation of ZnCl 2 /ZnO NPs was seen as Haloferax strain BBK2 (287.2/549.6 mg g -1 ) [ Halococcus strain BK6 (165.9/388.5 mg g -1 ) [ Haloarcula strain BS2 (93.2/28.5 mg g -1 ) [ Halorubrum strain BS17 (29.9/16.2 mg g -1 ). Scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDX) analysis revealed that bulk ZnCl 2 was sorbed at a higher concentration (21.77 %) on the cell surface of Haloferax strain BBK2 as compared to the ZnO NPs (14.89 %).

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“…[9][10][11][12][13][14] However, the underlying ecotoxicological effects on diverse aquatic organisms remain unclear. Daphnia magna and Chlorella sp.…”

Section: Introductionmentioning

confidence: 99%

Toxicity of lanthanum oxide (La₂O₃) nanoparticles in aquatic environments

Balusamy

Taştan

Ergen

et al. 2015

Environ. Sci.: Processes Impacts

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This study demonstrates the acute toxicity of lanthanum oxide nanoparticles (La 2 O 3 NP) on two sentinel aquatic species, fresh-water microalgae Chlorella sp. and the crustacean Daphnia magna. The morphology, size and charge of the nanoparticles were systematically studied. The algal growth inhibition assay confirmed absence of toxic effects of La 2 O 3 NP on Chlorella sp., even at higher concentration (1000 mg L À1 ) after 72 h exposure. Similarly, no significant toxic effects were observed on D. magna at concentrations of 250 mg L À1 or less, and considerable toxic effects were noted in higher concentrations (effective concentration [EC 50 ] 500 mg L À1 ; lethal dose [LD 50 ] 1000 mg L À1 ). In addition, attachment of La 2 O 3 NP on aquatic species was demonstrated using microscopy analysis. This study proved to be beneficial in understanding acute toxicity in order to provide environmental protection as part of risk assessment strategies. Environmental impactNanomaterials attracted signicant attention on potential adverse effects on aquatic organisms due to their mass production and ubiquitous applications. Researchers have begun exploring lanthanum oxide nanoparticles, among other rare earth elements, for potential uses in widespread applications and, subsequently, potential hazards. Results presented here demonstrate enhanced growth of Chlorella sp. with exposure to lanthanum oxide nanoparticles. In contrast, lanthanum oxide nanoparticles caused severe toxicity effects to Daphnia magna, including mortality. These observations demonstrate the toxic effects of lanthanum oxide nanoparticles upon release into aquatic environments.

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Interaction and nanotoxic effect of ZnO and Ag nanoparticles on mesophilic and halophilic bacterial cells

Cited by 203 publications

References 17 publications

Synthesis, characterisation and antimicrobial activity of manganese- and iron-doped zinc oxide nanoparticles

Synthesis, characterisation and antimicrobial activity of manganese- and iron-doped zinc oxide nanoparticles

Resistance of extremely halophilic archaea to zinc and zinc oxide nanoparticles

Toxicity of lanthanum oxide (La₂O₃) nanoparticles in aquatic environments

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Interaction and nanotoxic effect of ZnO and Ag nanoparticles on mesophilic and halophilic bacterial cells

Cited by 203 publications

References 17 publications

Synthesis, characterisation and antimicrobial activity of manganese- and iron-doped zinc oxide nanoparticles

Synthesis, characterisation and antimicrobial activity of manganese- and iron-doped zinc oxide nanoparticles

Resistance of extremely halophilic archaea to zinc and zinc oxide nanoparticles

Toxicity of lanthanum oxide (La2O3) nanoparticles in aquatic environments

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Product

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Toxicity of lanthanum oxide (La₂O₃) nanoparticles in aquatic environments