Reduction of selenite to red elemental selenium by moderately halotolerant Bacillus megaterium strains isolated from Bhitarkanika mangrove soil and characterization of reduced product

Mishra, Rashmi; Prajapati, Sunita; Das, J.; Dangar, Tushar Kanti; Das, Nigamananda; Thatoi, Hrudayanath

doi:10.1016/j.chemosphere.2011.05.025

Cited by 137 publications

(93 citation statements)

References 27 publications

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“…Elemental selenium nanoparticles can be formed naturally in certain bacteria, [41][42][43] and can be prepared through inorganic selenium reduction in the presence of protein or polysaccharide. 20,[44][45][46] Various sizes of selenium nanoparticles can be obtained by changing the concentration of a protein such as bovine serum albumin.…”

Section: Discussionmentioning

confidence: 99%

Impact of heat treatment on size, structure, and bioactivity of elemental selenium nanoparticles

Zhang¹,

Taylor²,

Wan³

et al. 2012

IJN

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Background: Elemental selenium nanoparticles have emerged as a novel selenium source with the advantage of reduced risk of selenium toxicity. The present work investigated whether heat treatment affects the size, structure, and bioactivity of selenium nanoparticles. Methods and results: After a one-hour incubation of solution containing 80 nm selenium particles in a 90°C water bath, the nanoparticles aggregated into larger 110 nm particles and nanorods (290 nm × 70 nm), leading to significantly reduced bioavailability and phase II enzyme induction in selenium-deficient mice. When a solution containing 40 nm selenium nanoparticles was treated under the same conditions, the nanoparticles aggregated into larger 72 nm particles but did not transform into nanorods, demonstrating that the thermostability of selenium nanoparticles is size-dependent, smaller selenium nanoparticles being more resistant than larger selenium nanoparticles to transformation into nanorods during heat treatment. Conclusion:The present results suggest that temperature and duration of the heat process, as well as the original nanoparticle size, should be carefully selected when a solution containing selenium nanoparticles is added to functional foods.

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Section: Discussionmentioning

confidence: 99%

Impact of heat treatment on size, structure, and bioactivity of elemental selenium nanoparticles

Zhang¹,

Taylor²,

Wan³

et al. 2012

IJN

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“…Thus, the bacterial strain used in the current study can be utilized as a nanofactory for large-scale commercial production of selenium nanoparticles. It is significant to note that, in the literature, selenium nanoparticle producing bacteria are reported in wide range of environments under aerobic and anaerobic conditions including in sludge and sewerage (Mishra et al 2011). The anaerobic/anoxic bacteria include strains such as Selenihalanaerobacter shriftii DSSE1, Sulfurospirillum barnesii (Oremland et al 2004), Rhodopseudomonas palustris N (Li et al 2014), Veillonella atypica (Pearce et al 2008), Shewanella putrefaciens 200 (Jiang et al 2012), Shewanella sp.…”

Section: Selenite Reduction and Biogenesis Of Selenium Nanoparticlesmentioning

confidence: 99%

“…4 Time-dependent UV-Vis absorption spectra of selenium nanoparticles synthesized by strain AJK3 at various selenite concentrations: a 0.25 mM, b 0.5 mM, and c 1.0 mM comparison with the anaerobic bacteria, the phenomenon is mostly cited in aerobic, Gram +ve Bacillus species such as B. cereus (Dhanjal and Cameotra 2010), Bacillus sp. MSh-1 (Shakibaie et al 2015), B. megaterium (Mishra et al 2011), B. mycoides SeITE01 (Lampis et al 2014), Bacillus sp. E5 (Durán et al 2015), B. licheniformis (Khiralla and El-Deeb 2015), B. subtilis (Wang et al 2010), etc.…”

Section: Selenite Reduction and Biogenesis Of Selenium Nanoparticlesmentioning

confidence: 99%

“…In addition, from the soil of a antimony mine from Lengshuijiang, southern China (Zheng et al 2014), soil of a magnesite mine from Salem, India (Ramya et al 2015), soil of a coal mine from West Bengal, India (Dhanjal and Cameotra 2010), selenium laden agricultural soil of North-East Punjab, India (Bajaj et al 2012), soil of mangrove forest from Bhitarkanika, Orissa, India (Mishra et al 2011), rhizosphere soil of a selenium hyperaccumulator legume grown in seleniferous mine from Sardina, Italy (Lampis et al 2014), rhizosphere of wheat grown in herbicide contaminated soil (Dwivedi et al 2013), and rhizosphere of cereal plants grown in ash-derived volcanic soil of southern Chile (Durán et al 2015). Others include rock fragments of black oil shale from Haenam, Korea (Tam et al 2010), food wastes collected from local market of Giza, Egypt (Khiralla and El-Deeb 2015), sub gingival dental plaque (Pearce et al 2008) etc.…”

Section: Introductionmentioning

confidence: 99%

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Bacillus cereus, selenite-reducing bacterium from contaminated lake of an industrial area: a renewable nanofactory for the synthesis of selenium nanoparticles

Kora

2018

Bioresour. Bioprocess.

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Background: An attempt was made to isolate selenite-reducing bacteria from a contaminated lake that receives industrial effluents and domestic sewage. The isolated dominant bacterial strain AJK3 was identified as Bacillus cereus, based on biochemical characterization and 16S rDNA sequencing. The time dependent selenium removal at different selenite concentrations monitored with ICP-AES indicates the substantial selenite reduction capability of the isolated strain. The selenium nanoparticles produced during the bacterial reduction of selenite were analyzed with UV-visible spectroscopy, X-ray diffraction, transmission electron microscopy, zeta potential measurement, Fourier transform infrared spectroscopy and Raman spectroscopy. Results:The nanoparticle synthesis was confirmed from the red colour emergence in culture broth and wide UV-vis peaks. The produced nanoparticles were polydisperse, spherical, size varied from 50 to 150 nm and the mean particle size was about 93 nm. The amorphous nature of the generated nanoparticles was confirmed from the Raman spectroscopy, XRD and SAED patterns. The IR data and zeta potential values substantiated the protein capping of the produced nanoparticles. Conclusions:Thus, the present study suggests that the isolated bacterial strain can be exploited as a prospective, renewable, natural, nanofactory for the bacteriogenic synthesis of nanoparticles. Also, the study has application in bioremediation of selenite from the contaminated environment.

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“…Extracellular or intracellular selenium nanoparticles can be produced by a wide variety of microorganisms through reducing selenite/selenate to elemental selenium (Mishra et al 2011;Wang et al 2010;Dhanjal and Cameotra 2010). Compared with intracellular selenium nanoparticles synthesized by microorganisms, extracellular selenium nanoparticles have the advantage in the recovery of the nanoparticles from a culture.…”

Section: Introductionmentioning

confidence: 99%

Expulsion of selenium/protein nanoparticles through vesicle-like structures by Saccharomyces cerevisiae under microaerophilic environment

Zhang

Gao

2012

World J Microbiol Biotechnol

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Nano-selenium/protein is a kind of lower toxic supplement to human. Many microorganisms can reduce selenite/selenate to intracellular or extracellular selenium nanoparticles. This study examined the influence of dissolved oxygen on the expulsion of extracellular selenium/ protein produced in Saccharomyces cerevisiae. More of the added selenite was reduced to extracellular selenium nanoparticles by yeast cells only under oxygen-limited condition than under aerobic or anaerobic condition. For the first time, we evidenced that selenium/protein nanoparticles synthesized in vivo were transported out of the cells by vesicle-like structures under microaerophilic environment. The characterizations of the extracellular spherical selenium/protein nanoparticles were also examined by SEM, TEM, EDX and FTIR.

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Reduction of selenite to red elemental selenium by moderately halotolerant Bacillus megaterium strains isolated from Bhitarkanika mangrove soil and characterization of reduced product

Cited by 137 publications

References 27 publications

Impact of heat treatment on size, structure, and bioactivity of elemental selenium nanoparticles

Impact of heat treatment on size, structure, and bioactivity of elemental selenium nanoparticles

Bacillus cereus, selenite-reducing bacterium from contaminated lake of an industrial area: a renewable nanofactory for the synthesis of selenium nanoparticles

Expulsion of selenium/protein nanoparticles through vesicle-like structures by Saccharomyces cerevisiae under microaerophilic environment

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