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Plants and microbes assisted selenium nanoparticles: characterization and application.

Husen A, Siddiqi KS - J Nanobiotechnology (2014)

Bottom Line: The Se nanoparticles of varying shape and size may be synthesized from Se salts especially selenite and selenates in presence of reducing agents such as proteins, phenols, alcohols and amines.These biomolecules can be used to reduce Se salts in vitro but the byproducts released in the environment may be hazardous to flora and fauna.Their shape, size, FTIR, UV-vis, Raman spectra, SEM, TEM images and XRD pattern have been analysed.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Biology, College of Natural and Computational Sciences, University of Gondar, Gondar, Ethiopia. adroot92@yahoo.co.in.

ABSTRACT
Selenium is an essential trace element and is an essential component of many enzymes without which they become inactive. The Se nanoparticles of varying shape and size may be synthesized from Se salts especially selenite and selenates in presence of reducing agents such as proteins, phenols, alcohols and amines. These biomolecules can be used to reduce Se salts in vitro but the byproducts released in the environment may be hazardous to flora and fauna. In this review, therefore, we analysed in depth, the biogenic synthesis of Se nanoparticles, their characterization and transformation into t- Se, m-Se, Se-nanoballs, Se-nanowires and Se-hollow spheres in an innocuous way preventing the environment from pollution. Their shape, size, FTIR, UV-vis, Raman spectra, SEM, TEM images and XRD pattern have been analysed. The weak forces involved in aggregation and transformation of one nano structure into the other have been carefully resolved.

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Selenite reduction by the mixed microbial culture isolated from agricultural soil. Selenite reduction at different Se (IV) concentrations (a) and development of red coloration in cultures after 5.5 h (b), 23 h (c) and 48 h (d) of incubation [58].
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Figure 4: Selenite reduction by the mixed microbial culture isolated from agricultural soil. Selenite reduction at different Se (IV) concentrations (a) and development of red coloration in cultures after 5.5 h (b), 23 h (c) and 48 h (d) of incubation [58].

Mentions: Due to their unique property Se nanoparticles are photovoltaic and semiconductor, antioxidant and chemoprotective agents [58]. Since Se nanoparticles inhibit the growth of Staphylococcus aureus it can be used as a medicine against S. aureus infection. Different concentration of Se starting from 65 to 230 mg/L of Se(IV) were allowed to interact with different types of microbes. Appearance of red colour was taken as sign of reduction of Se(IV) to Se(0) as shown in forward reaction above. However, there was no decolouration later, indicating the absence of any species causing oxidation of Se(IV) → Se(VI) (Figure 4). The redox process is time and concentration dependent. When bacterial culture was grown in presence of 40–100 mg/L selanate, no change in colour was observed even after long time. It appears as if the bacteria are resistant to Se(VI) reduction. However, such bacterial culture may be used to reduce soluble and toxic Se(IV) to non toxic and insoluble Se nanoparticles. It is also indicative of bioremediation of Se from selenites.


Plants and microbes assisted selenium nanoparticles: characterization and application.

Husen A, Siddiqi KS - J Nanobiotechnology (2014)

Selenite reduction by the mixed microbial culture isolated from agricultural soil. Selenite reduction at different Se (IV) concentrations (a) and development of red coloration in cultures after 5.5 h (b), 23 h (c) and 48 h (d) of incubation [58].
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4274736&req=5

Figure 4: Selenite reduction by the mixed microbial culture isolated from agricultural soil. Selenite reduction at different Se (IV) concentrations (a) and development of red coloration in cultures after 5.5 h (b), 23 h (c) and 48 h (d) of incubation [58].
Mentions: Due to their unique property Se nanoparticles are photovoltaic and semiconductor, antioxidant and chemoprotective agents [58]. Since Se nanoparticles inhibit the growth of Staphylococcus aureus it can be used as a medicine against S. aureus infection. Different concentration of Se starting from 65 to 230 mg/L of Se(IV) were allowed to interact with different types of microbes. Appearance of red colour was taken as sign of reduction of Se(IV) to Se(0) as shown in forward reaction above. However, there was no decolouration later, indicating the absence of any species causing oxidation of Se(IV) → Se(VI) (Figure 4). The redox process is time and concentration dependent. When bacterial culture was grown in presence of 40–100 mg/L selanate, no change in colour was observed even after long time. It appears as if the bacteria are resistant to Se(VI) reduction. However, such bacterial culture may be used to reduce soluble and toxic Se(IV) to non toxic and insoluble Se nanoparticles. It is also indicative of bioremediation of Se from selenites.

Bottom Line: The Se nanoparticles of varying shape and size may be synthesized from Se salts especially selenite and selenates in presence of reducing agents such as proteins, phenols, alcohols and amines.These biomolecules can be used to reduce Se salts in vitro but the byproducts released in the environment may be hazardous to flora and fauna.Their shape, size, FTIR, UV-vis, Raman spectra, SEM, TEM images and XRD pattern have been analysed.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Biology, College of Natural and Computational Sciences, University of Gondar, Gondar, Ethiopia. adroot92@yahoo.co.in.

ABSTRACT
Selenium is an essential trace element and is an essential component of many enzymes without which they become inactive. The Se nanoparticles of varying shape and size may be synthesized from Se salts especially selenite and selenates in presence of reducing agents such as proteins, phenols, alcohols and amines. These biomolecules can be used to reduce Se salts in vitro but the byproducts released in the environment may be hazardous to flora and fauna. In this review, therefore, we analysed in depth, the biogenic synthesis of Se nanoparticles, their characterization and transformation into t- Se, m-Se, Se-nanoballs, Se-nanowires and Se-hollow spheres in an innocuous way preventing the environment from pollution. Their shape, size, FTIR, UV-vis, Raman spectra, SEM, TEM images and XRD pattern have been analysed. The weak forces involved in aggregation and transformation of one nano structure into the other have been carefully resolved.

Show MeSH
Related in: MedlinePlus