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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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Photoluminescence spectra of selenium nanoparticles synthesized using leaf extract[[55]].
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Figure 3: Photoluminescence spectra of selenium nanoparticles synthesized using leaf extract[[55]].

Mentions: Se nanoparticles of approximately 35 nm have been synthesized from gum arabic which remain stable in solution for about 30 days. The gum arabic was found to be a better stabilizer for Se nanoparticles than the hydrolysed gum arabic [54]. The Se nanoparticles synthesized from lemon leaf extract exhibited an absorption maximum at 395 nm in the UV–vis region. Initially, the mixture of leaf extract and SeO3 2− remains colourless but after stirring and incubating it for 24 hr at 30°C, it turns red [55]. The photoluminescence spectra exhibited excitation peak at 395 and emission peak at 525 nm (Figure 3). It has been found from TEM image that the size of particles ranges between 60–80 nm. They are polydispersed in colloidal solution but crystalline in nature [55]. The FTIR spectra of the samples with and without Se nanoparticles were compared to examine the changes in the functional groups of the biomolecules. The broad peak at 3415 due to ʋ(NH) shifts to 3418 cm−1 but new peaks appear at 2930 and 3456 cm−1 in the colloidal solution containing Se nanoparticles. The region 1500–1800 cm−1 is due to various amide bands which split into some new bands in colloidal solution. However, after reduction of the Na2SeO3 to Se nanoparticles by the biomolecules in the extract containing functional groups such as alcohol, aldehyde, phenol etc., they are oxidized to the following species:


Plants and microbes assisted selenium nanoparticles: characterization and application.

Husen A, Siddiqi KS - J Nanobiotechnology (2014)

Photoluminescence spectra of selenium nanoparticles synthesized using leaf extract[[55]].
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 3: Photoluminescence spectra of selenium nanoparticles synthesized using leaf extract[[55]].
Mentions: Se nanoparticles of approximately 35 nm have been synthesized from gum arabic which remain stable in solution for about 30 days. The gum arabic was found to be a better stabilizer for Se nanoparticles than the hydrolysed gum arabic [54]. The Se nanoparticles synthesized from lemon leaf extract exhibited an absorption maximum at 395 nm in the UV–vis region. Initially, the mixture of leaf extract and SeO3 2− remains colourless but after stirring and incubating it for 24 hr at 30°C, it turns red [55]. The photoluminescence spectra exhibited excitation peak at 395 and emission peak at 525 nm (Figure 3). It has been found from TEM image that the size of particles ranges between 60–80 nm. They are polydispersed in colloidal solution but crystalline in nature [55]. The FTIR spectra of the samples with and without Se nanoparticles were compared to examine the changes in the functional groups of the biomolecules. The broad peak at 3415 due to ʋ(NH) shifts to 3418 cm−1 but new peaks appear at 2930 and 3456 cm−1 in the colloidal solution containing Se nanoparticles. The region 1500–1800 cm−1 is due to various amide bands which split into some new bands in colloidal solution. However, after reduction of the Na2SeO3 to Se nanoparticles by the biomolecules in the extract containing functional groups such as alcohol, aldehyde, phenol etc., they are oxidized to the following species:

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