Insights into selenite reduction and biogenesis of elemental selenium nanoparticles by two environmental isolates of Burkholderia fungorum

2017 ◽  
Vol 34 ◽  
pp. 1-11 ◽  
Author(s):  
Nazanin Seyed Khoei ◽  
Silvia Lampis ◽  
Emanuele Zonaro ◽  
Kim Yrjälä ◽  
Paolo Bernardi ◽  
...  
Keyword(s):  
Selenium Nanoparticles ◽  
Elemental Selenium ◽  
Environmental Isolates ◽  
Selenite Reduction

scholarly journals ANTIOXIDANT ACTIVITY AND BIOGENIC SYNTHESIS OF SELENIUM NANOPARTICLES USING THE LEAF EXTRACT OF ALOE VERA

2017 ◽  
Vol 9 (4) ◽  
pp. 147 ◽  
Author(s):  
Jay Vyas ◽  
Shafkat Rana
Keyword(s):  
Antioxidant Activity ◽  
Aloe Vera ◽  
Selenium Nanoparticles ◽  
Spherical Particles ◽  
Elemental Selenium ◽  
Biogenic Synthesis ◽  
Transmission Electron ◽  
Ft Ir ◽  
Ir Analysis ◽  
Chemoprevention Agent

Objective: The objective of this present study were to the biogenic synthesis of selenium nanoparticles using Aloe vera extract and check it’s antioxidant potential by ABTS, DPPH and FRAP assays.Methods: In this study we investigated the clove of Aloe vera, which is used for the synthesis of selenium nanoparticles were characterized by using UV-Visible (UV-VIS) spectrophotometer, Transmission electron microscopy (TEM), Fourier transform spectroscopy (FTIR) and Energy dispersive X-Ray spectroscopy (EDAX) and ABTS, DPPH and FRAP assays for checked it’s antioxidant potential.Results: The present study was carried out to synthesis of Selenium nanoparticles using extract of Aloe vera. UV-Vis Spectra at 350 nm with Aloe vera extract and observed as hollow and spherical particles in size ranging 7-48 nm which is found more stable more than two months. EDAX analysis was carried out to check the presoak of Selenium in nanoparticles. Results of EDAX, confirmed its present. TEM and SEAD represented addition evidence of formation of nanoparticles whereas SEAD indicates the particles were crystalline in nature. FT-IR analysis was carried out to identify the possible bio molecules and Aloe vera extract-metal ions interaction responsible for formation and stabilization of selenium nanoparticles. FRAP, ABTS and DPPH assay results sequester that Selenium nanoparticles prepared using Aloe vera extract possess more activity than extract alone.Conclusion: The bio molecules of Aloe veraextract acted as stabilizing as well as capping agent leading to the formation of Selenium nanoparticles. Selenite has been proven to have antioxidant activity and is being used as chemoprevention agent in cancer diagnosis but same time it is toxic also. Elemental Selenium i.e. Selenium nanoparticles are less toxic form of selenium. 

Accumulation of red elemental selenium nanoparticles and their biological effects in Nicotinia tabacum

2012 ◽  
Vol 68 (3) ◽  
pp. 525-531 ◽  
Author(s):  
Eva Domokos-Szabolcsy ◽  
Laszlo Marton ◽  
Attila Sztrik ◽  
Beata Babka ◽  
Jozsef Prokisch ◽  
...  
Keyword(s):  
Biological Effects ◽  
Selenium Nanoparticles ◽  
Elemental Selenium

Reduction of Selenite and Detoxification of Elemental Selenium by the Phototrophic BacteriumRhodospirillum rubrum

1999 ◽  
Vol 65 (11) ◽  
pp. 4734-4740 ◽  
Author(s):  
J. Kessi ◽  
M. Ramuz ◽  
E. Wehrli ◽  
M. Spycher ◽  
R. Bachofen
Keyword(s):  
Cell Wall ◽  
Plasma Membrane ◽  
Cell Density ◽  
Culture Medium ◽  
Rhodospirillum Rubrum ◽  
Buoyant Density ◽  
Elemental Selenium ◽  
Selenite Reduction ◽  
Final Cell Density ◽  
Cell Densities

ABSTRACT The effect of selenite on growth kinetics, the ability of cultures to reduce selenite, and the mechanism of detoxification of selenium were investigated by using Rhodospirillum rubrum. Anoxic photosynthetic cultures were able to completely reduce as much as 1.5 mM selenite, whereas in aerobic cultures a 0.5 mM selenite concentration was only reduced to about 0.375 mM. The presence of selenite in the culture medium strongly affected cell division. In the presence of a selenite concentration of 1.5 mM cultures reached final cell densities that were only about 15% of the control final cell density. The cell density remained nearly constant during the stationary phase for all of the selenite concentrations tested, showing that the cells were not severely damaged by the presence of selenite or elemental selenium. Particles containing elemental selenium were observed in the cytoplasm, which led to an increase in the buoyant density of the cells. Interestingly, the change in the buoyant density was reversed after selenite reduction was complete; the buoyant density of the cells returned to the buoyant density of the control cells. This demonstrated that R. rubrum expels elemental selenium across the plasma membrane and the cell wall. Accordingly, electron-dense particles were more numerous in the cells during the reduction phase than after the reduction phase.

Removal of Copper from Aqueous Solutions by Adsorption on Elemental Selenium Nanoparticles

2011 ◽  
Vol 56 (5) ◽  
pp. 2563-2568 ◽  
Author(s):  
Yan Bai ◽  
Fengxia Rong ◽  
Hui Wang ◽  
Yanhui Zhou ◽  
Xinyuan Xie ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Selenium Nanoparticles ◽  
Elemental Selenium

scholarly journals Biomagnetic Recovery and Bioaccumulation of Selenium Granules in Magnetotactic Bacteria

2016 ◽  
Vol 82 (13) ◽  
pp. 3886-3891 ◽  
Author(s):  
Masayoshi Tanaka ◽  
William Knowles ◽  
Rosemary Brown ◽  
Nicole Hondow ◽  
Atsushi Arakaki ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Magnetic Particles ◽  
Magnetotactic Bacteria ◽  
Selenium Nanoparticles ◽  
Water Remediation ◽  
Polluted Water ◽  
Contaminated Water ◽  
Elemental Selenium ◽  
Cell Recovery

ABSTRACTUsing microorganisms to remove waste and/or neutralize pollutants from contaminated water is attracting much attention due to the environmentally friendly nature of this methodology. However, cell recovery remains a bottleneck and a considerable challenge for the development of this process. Magnetotactic bacteria are a unique group of organisms that can be manipulated by an external magnetic field due to the presence of biogenic magnetite crystals formed within their cells. In this study, we demonstrated an account of accumulation and precipitation of amorphous elemental selenium nanoparticles within magnetotactic bacteria alongside and independent of magnetite crystal biomineralization when grown in a medium containing selenium oxyanion (SeO32−). Quantitative analysis shows that magnetotactic bacteria accumulate the largest amount of target molecules (Se) per cell compared with any other previously reported nonferrous metal/metalloid. For example, 2.4 and 174 times more Se is accumulated than Te taken up into cells and Cd2+adsorbed onto the cell surface, respectively. Crucially, the bacteria with high levels of Se accumulation were successfully recovered with an external magnetic field. The biomagnetic recovery and the effective accumulation of target elements demonstrate the potential for application in bioremediation of polluted water.IMPORTANCEThe development of a technique for effective environmental water remediation is urgently required across the globe. A biological remediation process of waste removal and/or neutralization of pollutant from contaminated water using microorganisms has great potential, but cell recovery remains a bottleneck. Magnetotactic bacteria synthesize magnetic particles within their cells, which can be recovered by a magnetic field. Herein, we report an example of accumulation and precipitation of amorphous elemental selenium nanoparticles within magnetotactic bacteria independent of magnetic particle synthesis. The cells were able to accumulate the largest amount of Se compared to other foreign elements. More importantly, the Se-accumulating bacteria were successfully recovered with an external magnetic field. We believe magnetotactic bacteria confer unique advantages of biomagnetic cell recovery and of Se accumulation, providing a new and effective methodology for bioremediation of polluted water.

scholarly journals Selenite reduction by the rhizobacterium Azospirillum brasilense, synthesis of extracellular selenium nanoparticles and their characterisation

2020 ◽  
Vol 58 ◽  
pp. 17-24 ◽  
Author(s):  
Anna V. Tugarova ◽  
Polina V. Mamchenkova ◽  
Vitaly A. Khanadeev ◽  
Alexander A. Kamnev
Keyword(s):  
Azospirillum Brasilense ◽  
Selenium Nanoparticles ◽  
Selenite Reduction

scholarly journals BIOGENIC SELENIUM NANOPARTICLES FOR THEIR THERAPEUTIC APPLICATION

2019 ◽  
pp. 4-9
Author(s):  
AWANISH KUMAR ◽  
KUMAR SURANJIT PRASAD
Keyword(s):  
Trace Element ◽  
Environmental Remediation ◽  
Pharmaceutical Research ◽  
Selenium Nanoparticles ◽  
Elemental Selenium ◽  
Essential Trace Element ◽  
Natural Ecosystems ◽  
Anticancer Efficacy ◽  
Living Organisms ◽  
Biogenic Selenium Nanoparticles

Biosynthesis is an eloquent, safe, biocompatible, eco-friendly, and recyclable way of preparing selenium nanoparticles (SeNPs). Selenium occurs in multiple oxidation states, for example, +6, +4, 0, or −2. Selenium (Se) is an essential trace element with a very narrow margin between the lowest acceptable levels of intake and toxicity. Selenium is an essential trace element required for all living organisms. Despite its essentiality, selenium is a potentially toxic element to natural ecosystems due to its bioaccumulation potential that is why it is biologically available in the environment. Selenium is a trace element commonly found in materials of the earth’s crust, and it is essential for humans, animals, and plants. Oxyanions of selenium, that is selenite and selenate, are biologically available. Selenium in the form of selenate ion (SeO42−) is more toxic to most organisms than selenite (SeO32−). Contrarily, elemental selenium (Se0) is inOsoluble and less toxic in comparison to other forms of selenium. Nanoselenium (Se0) in the range of 100–500 nm has similar bioavailability to other forms of selenium into plants, animals, humans, and microorganisms. Biologically synthesized SeNP has many biological applications in the field of medical and pharmaceutical research to combat threats to human health. Biogenic SeNPs have anticancer (cytotoxic) activity, antioxidant activity, and antimicrobial activity. Researches are going on with special interest of SeNPs. Conjugation of antibiotics with SeNPs enhances their anticancer efficacy. SeNPs have also applications in nanobiosensors and environmental remediation.

Preferential adsorption of Cu in a multi-metal mixture onto biogenic elemental selenium nanoparticles

2016 ◽  
Vol 284 ◽  
pp. 917-925 ◽  
Author(s):  
Rohan Jain ◽  
Domician Dominic ◽  
Norbert Jordan ◽  
Eldon R. Rene ◽  
Stephan Weiss ◽  
...  
Keyword(s):  
Selenium Nanoparticles ◽  
Elemental Selenium ◽  
Metal Mixture ◽  
Preferential Adsorption

scholarly journals Delayed formation of zero-valent selenium nanoparticles by Bacillus mycoides SeITE01 as a consequence of selenite reduction under aerobic conditions

2014 ◽  
Vol 13 (1) ◽  
pp. 35 ◽  
Author(s):  
Silvia Lampis ◽  
Emanuele Zonaro ◽  
Cristina Bertolini ◽  
Paolo Bernardi ◽  
Clive S Butler ◽  
...  
Keyword(s):  
Selenium Nanoparticles ◽  
Bacillus Mycoides ◽  
Selenite Reduction ◽  
Aerobic Conditions

Understanding the composition and spatial distribution of biological selenate reduction products for potential selenium recovery

2020 ◽  
Vol 6 (8) ◽  
pp. 2153-2163 ◽  
Author(s):  
Zhiming Zhang ◽  
Yi Xiong ◽  
Huan Chen ◽  
Youneng Tang
Keyword(s):  
Spatial Distribution ◽  
Biofilm Reactor ◽  
Operating Conditions ◽  
Selenium Nanoparticles ◽  
Elemental Selenium ◽  
Membrane Biofilm Reactor

This work determines the spatial distribution of produced elemental selenium nanoparticles (SeNPs) and selenium sulfides in a membrane biofilm reactor under various operating conditions, and identifies the condition for exclusive SeNPs production.

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