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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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Raman scattering spectra of SeNPs trapped at different incubation times: (a) 24 h and (b) 48 h[[65]].
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Figure 5: Raman scattering spectra of SeNPs trapped at different incubation times: (a) 24 h and (b) 48 h[[65]].

Mentions: The FTIR spectra of the samples with and without Se nanoparticles showed that the intensity of the spectral peaks containing Se nanoparticles is drastically diminished [65] which suggests strong interaction between Se atoms and the protein molecules present in the P. alcaliphila. This is to be noted that the interaction between Se nanoparticles and protein is simply electrostatic because the intensity of sample containing Se atoms was decreased followed by an increase in ʋ(NH) from 3421 to 3435 cm−1. The Raman spectra also support the formation of trigonal selenium (t-Se) and monoclinic selenium (m-Se) by the appearance of peaks at 234 and 254 cm−1, respectively (Figure 5). A peak at 235 cm−1 is mainly due to chain like structure of t-Se. As the peak at 234 cm−1 appears after 48 h of inoculation, it is considered as the transformation of one form of Se into other. The FESEM images which show the accumulation of nanorods on the nanoballs. The size can be controlled by PVP at different time of incubation of nanospheres ranging from 20–200 nm.


Plants and microbes assisted selenium nanoparticles: characterization and application.

Husen A, Siddiqi KS - J Nanobiotechnology (2014)

Raman scattering spectra of SeNPs trapped at different incubation times: (a) 24 h and (b) 48 h[[65]].
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 5: Raman scattering spectra of SeNPs trapped at different incubation times: (a) 24 h and (b) 48 h[[65]].
Mentions: The FTIR spectra of the samples with and without Se nanoparticles showed that the intensity of the spectral peaks containing Se nanoparticles is drastically diminished [65] which suggests strong interaction between Se atoms and the protein molecules present in the P. alcaliphila. This is to be noted that the interaction between Se nanoparticles and protein is simply electrostatic because the intensity of sample containing Se atoms was decreased followed by an increase in ʋ(NH) from 3421 to 3435 cm−1. The Raman spectra also support the formation of trigonal selenium (t-Se) and monoclinic selenium (m-Se) by the appearance of peaks at 234 and 254 cm−1, respectively (Figure 5). A peak at 235 cm−1 is mainly due to chain like structure of t-Se. As the peak at 234 cm−1 appears after 48 h of inoculation, it is considered as the transformation of one form of Se into other. The FESEM images which show the accumulation of nanorods on the nanoballs. The size can be controlled by PVP at different time of incubation of nanospheres ranging from 20–200 nm.

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