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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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Se nanoparticle synthesis usingCapsicum annumextract (a) The time-dependent color changes of the reaction solution; (i), (ii), (iii) represents 0, 5, 15 h, respectively.(b) XPS spectrum of the product obtained from reaction solution (I). (c) Typical XRD pattern of the same product of reaction solution (I). (d) Raman spectrum of the same reaction product as in (c)[19].
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Figure 2: Se nanoparticle synthesis usingCapsicum annumextract (a) The time-dependent color changes of the reaction solution; (i), (ii), (iii) represents 0, 5, 15 h, respectively.(b) XPS spectrum of the product obtained from reaction solution (I). (c) Typical XRD pattern of the same product of reaction solution (I). (d) Raman spectrum of the same reaction product as in (c)[19].

Mentions: Although, biochemicals may often be used for the synthesis of nanomaterials, the biogenic synthetic route is frequently applied due to its ease and simplicity and, also because no hazardous and toxic residues are released in the environment [35],[36]. In general, a variety of Se nanoparticles are produced when H2SeO3 is treated with plant extracts for instance, α-Se nanoparticles have been fabricated from Capsicum annum extract in aqueous medium at low pH and at ambient temperature [19]. The light green extract of C. annum turns pale after 5 h of the addition of H2SeO3, and then gradually turned red after 12 h (Figure 2a). This red colour is the characteristic signature of α-Se in the x-ray photoemission spectroscopy (XPS) which is due to excitation of their surface plasmon vibration [37]. Its XPS spectrum (Figure 2b) shows a sharp peak at 54.4 eV which corresponds to the elemental selenium [38]. The XRD pattern of the Se nanoparticles shows a broad peak at 2θ angles of 15-350 (Figure 2c) which suggests that the nanoparticles are not crystalline. Their Raman spectrum displayed a resonance peak at 263.7 cm−1 which (Figure 2d) further confirms the formation of α-Se nanoparticles [39]. An additional peak at 474 cm−1 has been attributed to the protein vibration which is mixed with amorphous Se.


Plants and microbes assisted selenium nanoparticles: characterization and application.

Husen A, Siddiqi KS - J Nanobiotechnology (2014)

Se nanoparticle synthesis usingCapsicum annumextract (a) The time-dependent color changes of the reaction solution; (i), (ii), (iii) represents 0, 5, 15 h, respectively.(b) XPS spectrum of the product obtained from reaction solution (I). (c) Typical XRD pattern of the same product of reaction solution (I). (d) Raman spectrum of the same reaction product as in (c)[19].
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: Se nanoparticle synthesis usingCapsicum annumextract (a) The time-dependent color changes of the reaction solution; (i), (ii), (iii) represents 0, 5, 15 h, respectively.(b) XPS spectrum of the product obtained from reaction solution (I). (c) Typical XRD pattern of the same product of reaction solution (I). (d) Raman spectrum of the same reaction product as in (c)[19].
Mentions: Although, biochemicals may often be used for the synthesis of nanomaterials, the biogenic synthetic route is frequently applied due to its ease and simplicity and, also because no hazardous and toxic residues are released in the environment [35],[36]. In general, a variety of Se nanoparticles are produced when H2SeO3 is treated with plant extracts for instance, α-Se nanoparticles have been fabricated from Capsicum annum extract in aqueous medium at low pH and at ambient temperature [19]. The light green extract of C. annum turns pale after 5 h of the addition of H2SeO3, and then gradually turned red after 12 h (Figure 2a). This red colour is the characteristic signature of α-Se in the x-ray photoemission spectroscopy (XPS) which is due to excitation of their surface plasmon vibration [37]. Its XPS spectrum (Figure 2b) shows a sharp peak at 54.4 eV which corresponds to the elemental selenium [38]. The XRD pattern of the Se nanoparticles shows a broad peak at 2θ angles of 15-350 (Figure 2c) which suggests that the nanoparticles are not crystalline. Their Raman spectrum displayed a resonance peak at 263.7 cm−1 which (Figure 2d) further confirms the formation of α-Se nanoparticles [39]. An additional peak at 474 cm−1 has been attributed to the protein vibration which is mixed with amorphous Se.

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