In vivo synthesis of nano-selenium by Tetrahymena thermophila SB210

Cui, Yinhua; Li, Lingli; Zhou, Nanqing; Liu, Jinghua; Huang, Qing; Wang, Huijuan; Tian, Jie; Yu, Han‐Qing

doi:10.1016/j.enzmictec.2016.08.017

Cited by 44 publications

(26 citation statements)

References 35 publications

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“…Biogenic SeNPs (BioSeNPs) were obtained through the reduction of sodium selenite (1 mM) by Citrobacter freundii Y9, with the collected BioSeNPs from culture supernatants being purified according to Cui et al (2016) and freezedried for future use. Purified BioSeNPs were characterized using transmission {PAGE \* MERGEFORMAT} electron microscopy with energy-dispersive X-ray spectrometry (TEM-EDS) (FEI Tecnai G2 F20 S-TWIN, Houston, USA) and X-ray diffraction (XRD) (Bruker D8, Karlsruhe, Germany).…”

Section: Preparation Of Saline Solution/soil and Biosenpsmentioning

confidence: 99%

Immobilization of elemental mercury by biogenic Se nanoparticles in soils of varying salinity

Wang

Pan

Gadd

2019

Science of The Total Environment

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Salinity can be a significant environmental stress which can govern the fate of nanoparticles in the environment as well as other factors such as pH, natural organic matter and minerals. In this research, the effects of salinity on the behaviour of biogenic selenium nanoparticles (BioSeNPs) and consequences for elemental mercury (Hg 0 ) immobilization in soil and soil solutions were investigated. It was found that homoaggregation and sedimentation of BioSeNPs were enhanced significantly with increasing salinity. Compression of the electric double layers of BioSeNPs at high ionic strengths resulted in attractive van der Waals forces dominating and leading to enhanced aggregation. Moreover, neutralization of the surface negative charge of BioSeNPs by divalent cations and the bridging of BioSeNPs via calcium binding to surface functional groups were also associated with enhanced aggregation. Such enhanced aggregation exerted inhibition of Hg 0 immobilization in soil solutions/soils of varying salinity. These results indicate that salinity is an important environmental factor governing aggregation of BioSeNPs and therefore influencing the efficiency of Hg 0 immobilization, and possible remediation treatments, as a consequence.

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Section: Preparation Of Saline Solution/soil and Biosenpsmentioning

confidence: 99%

Immobilization of elemental mercury by biogenic Se nanoparticles in soils of varying salinity

Wang

Pan

Gadd

2019

Science of The Total Environment

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“…are usually used for the chemical synthesis of SeNPs, which are involved in lines of catalytic reduction ( Hong Lin et al, 2004 ; Zhang et al, 2010 ; Dwivedi et al, 2011 ). Previous researches indicate that certain bacteria ( Cui et al, 2016 ), fungi ( Vetchinkina et al, 2013 ), and plants ( Salunke et al, 2014 ) can mediate the biological synthesis of SeNPs. However, in the process of preparation of SeNPs, unsafe factors brought by physical and chemical methods limit the development and wide application of SeNPs in food, biomedicine, and feed additives ( Iranifam et al, 2013 ).…”

Section: Introductionmentioning

confidence: 99%

“…However, in the process of preparation of SeNPs, unsafe factors brought by physical and chemical methods limit the development and wide application of SeNPs in food, biomedicine, and feed additives ( Iranifam et al, 2013 ). However, biogenic synthesis of SeNPs usually applies some safe, low-cost, eco-friendly, and non-toxic materials ( Salunke et al, 2014 ; Singh et al, 2015 ; Cui et al, 2016 ). Furthermore, biogenic synthesis of SeNPs by probiotics is large-scale, green and safe, low cost, high efficiency, and without seasonal restrictions.…”

Section: Introductionmentioning

confidence: 99%

Biogenic Synthesis of Novel Functionalized Selenium Nanoparticles by Lactobacillus casei ATCC 393 and Its Protective Effects on Intestinal Barrier Dysfunction Caused by Enterotoxigenic Escherichia coli K88

Guo

Qiao

et al. 2018

Front. Microbiol.

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Selenium (Se) is an essential element for human and animal health. Biogenic selenium nanoparticles (SeNPs) by microorganism possess unique physical and chemical properties and biological activities compared with inorganic Se and organic Se. The study was conducted to investigate the mainly biological activities of SeNPs by Lactobacillus casei ATCC 393 (L. casei 393). The results showed that L. casei 393 transformed sodium selenite to red SeNPs with the size of 50–80 nm, and accumulated them intracellularly. L. casei 393-SeNPs promoted the growth and proliferation of porcine intestinal epithelial cells (IPEC-J2), human colonic epithelial cells (NCM460), and human acute monocytic leukemia cell (THP-1)-derived macrophagocyte. L. casei 393-SeNPs significantly inhibited the growth of human liver tumor cell line-HepG2, and alleviated diquat-induced IPEC-J2 oxidative damage. Moreover, in vivo and in vitro experimental results showed that administration with L. casei 393-SeNPs protected against Enterotoxigenic Escherichia coli K88 (ETEC K88)-caused intestinal barrier dysfunction. ETEC K88 infection-associated oxidative stress (glutathione peroxidase activity, total superoxide dismutase activity, total antioxidant capacity, and malondialdehyde) was ameliorated in L. casei 393-SeNPs-treated mice. These findings suggest that L. casei 393-SeNPs with no cytotoxicity play a key role in maintaining intestinal epithelial integrity and intestinal microflora balance in response to oxidative stress and infection.

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“…T. thermophila cultured in proteose, peptone medium containing 1% (w/v) proteose peptone, 0.1% yeast extract, 0.2% glucose, 0.003% ethylenediaminetetraacetic acid ferric sodium salt, and maintained at 27°C in an orbital shaker. Then, sodium selenite 150 µM (Na 2 SeO 3 ) was used for the synthesis of SeNPs [38]. Thauera selenatis (a β-proteobacterium) has been used for the reduction of selenate to synthesize intracellular selenium (Se) deposits that were ultimately secreted as selenium nanospheres of approximately 150 nm in diameter [39].…”

Section: Methods Used For the Biogenic Synthesis Of Senpsmentioning

confidence: 99%

Biogenic Selenium Nanoparticles for Their Therapeutic Application

Kumar

Prasad

2019

Asian J Pharm Clin Res

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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.

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In vivo synthesis of nano-selenium by Tetrahymena thermophila SB210

Cited by 44 publications

References 35 publications

Immobilization of elemental mercury by biogenic Se nanoparticles in soils of varying salinity

Immobilization of elemental mercury by biogenic Se nanoparticles in soils of varying salinity

Biogenic Synthesis of Novel Functionalized Selenium Nanoparticles by Lactobacillus casei ATCC 393 and Its Protective Effects on Intestinal Barrier Dysfunction Caused by Enterotoxigenic Escherichia coli K88

Biogenic Selenium Nanoparticles for Their Therapeutic Application

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