Stoichiometrically controlled production of bimetallic Gold-Silver alloy colloids using micro-alga cultures

Dahoumane, Si Amar; Wijesekera, Kushlani; Filipe, Carlos D. M.; Brennan, John D.

doi:10.1016/j.jcis.2013.10.048

Cited by 56 publications

(33 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In addition, most EPS are water-soluble polymers [48], so their presence at the NP surface improves the stability of colloidal gold in aqueous solutions. Similar findings had been published by Dahoumane and coauthors, who indicated the important role of EPS produced by photosynthetic organisms in the stabilization of AuNPs [24,29,31]. Moreover, his recently published results show that besides EPS, the presence of lactate molecules in the medium may improve the stability of the as-produced AuNPs by algae [32].…”

Section: Discussionsupporting

confidence: 87%

“…However, the mentioned enzymes are not the main or only ones responsible for the production of AuNPs, since there is evidence that NPs obtained extracellularly are present mostly within vegetative cells and not in heterocysts [22,28]. The study of Dahoumane and coauthors proved that other types of microalgae, devoid of nitrogenases, offer a better yield of nanoparticles [24,29,31,32]. Spirulina platensis is the most frequently mentioned cyanobacterial species able to produce AuNPs [33,34] and thus can be regarded as a model microorganism in this group.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Formation of Variously Shaped Gold Nanoparticles by Anabaena laxa

et al. 2017

View full text Add to dashboard Cite

Anew aspect of this study is the biocatalysis ability of Anabaena laxafresh-water strain-which to date has not been studied with respect to the formation of gold nanoparticles. The results of our study have shown that A. laxa is able to form gold nanoparticles (AuNPs) at good yields within 24 h of incubation at all three tested concentrations (0.1, 0.5 and 1 mM) of hydrogen tetrachloroaurate (III). After 24 h, nanoparticles were mostly localized in the growth medium, which significantly facilitates their isolation. However, the elongation of this process is accompanied by their concentration in the exopolysaccharide (EPS) layer of the cyanobacterial cells. There is a correlation between the initial concentration of the Au 3? cations and the formation of AuNPs of various shapes and a size. The comparison of activities of living and deactivated cells indicated that AuNPs were formed more efficiently when metabolically active cyanobacteria were used.

show abstract

Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Formation of Variously Shaped Gold Nanoparticles by Anabaena laxa

et al. 2017

View full text Add to dashboard Cite

show abstract

“…1A). The fact that all spectra are comprised of a single and well defined SPR bands is evidence that all colloids are composed of small, round nanoparticles with relatively uniform size (DAHOUMANE et al, 2014). In the UV-vis absorption spectrum, SPR peaks located at 418, 420, 419 and 419 nm were observed for nanoparticles synthesized by 1, 2, 3 and 4 week-old algae, respectively.…”

Section: Influence Of Culture Agementioning

confidence: 95%

“…They did not produced nanoparticles into the solution but desorbed them from the biomass surface. DAHOUMANE et al (2014) used living cells of Chlamydomonas reinhardtii for production of stable bimetallic Ag-Au nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Culture Age and Initial Silver Concentration on Biosynthesis of Ag Nanoparticles

Kaduková¹,

Velgosová²,

Mražíková³

et al. 2014

Nova Biotechnologica Et Chimica

View full text Add to dashboard Cite

Abstract:Many organisms or their extracts have the ability to reduce Ag + ions to Ag 0 and stabilize them what results in nanoparticle formation in solution. The aim of the article was to study the influence of two selected parameters -initial silver concentration and culture age, on Ag nanoparticles production by green algae Parachlorella kessleri. The presence of Ag nanoparticles in the solution was confirmed by the UV-vis spectroscopy and TEM analyses. Typical curve with the peak at app. 420 nm was found for nanoparticles produced by algae. While culture age did not have any significant effect, the initial silver concentration had significant influence on nanoparticle production which influenced the rate of nanoparticle production, their amount, their size and stability, as well.

show abstract

“…They did not produce nanoparticles into the solution but desorbed them from the biomass surface. Dahoumane at paper [11] used living cells of Chlamydomonas reinhardtii for production of stable bimetallic Ag-Au nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Control over the Biological Synthesis of Ag Nanoparticles by Selection of the Specific Algal Species

Sedláková-Kaduková¹,

Velgosová

Vosátka

et al. 2017

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

The application of green synthesis in the nano-science and technology is of great importance in the area of the preparation of various materials. In this work, three selected algal species Parachlorella kessleri, Dictyosphaerium chlorelloides and Desmodesmus quadricauda were successfully used for the preparation of silver nanoparticles (AgNPs). Presence of AgNPs was confirmed by UV-vis spectroscopy and transmission electron microscopy. AgNPs produced by P. kessleri had narrow size distribution and average sizes of 7.6 nm. However, nanoparticle production lasted for long time. Nanoparticle formation by D. chlorelloides was the fastest, although, their average sizes were 23.4 nm with broad size distribution. Nanoparticles produced by D. quadricauda had average sizes 23.9 nm but they were the least stable, aggregated and precipitated from solutions within 3 days. These results confirmed that the size distribution and mean diameter of the nanoparticles, crucial for various applications, can be controlled by the organism selection.

show abstract

Stoichiometrically controlled production of bimetallic Gold-Silver alloy colloids using micro-alga cultures

Cited by 56 publications

References 48 publications

Formation of Variously Shaped Gold Nanoparticles by Anabaena laxa

Formation of Variously Shaped Gold Nanoparticles by Anabaena laxa

The Effect of Culture Age and Initial Silver Concentration on Biosynthesis of Ag Nanoparticles

Control over the Biological Synthesis of Ag Nanoparticles by Selection of the Specific Algal Species

Contact Info

Product

Resources

About