Preconcentration of 198Au in a green alga, Rhizoclonium&lt;/p&gt; &lt;/p&gt;

Nayak, Dalia; Nag, Mrinmoy; Banerjee, Saikat; Pal, Ruma; Laskar, Subrata; Lahiri, Susanta

doi:10.1556/jrnc.268.2006.2.22

Cited by 6 publications

(7 citation statements)

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“…Among the microorganisms, microalgae and cyanobacteria appear to be the most suitable bioreagents for nanoparticle synthesis as they grow rapidly, producing large biomass at lower cost. Gold nanoparticle formation (other than nanorods) by some prokaryotic and eukaryotic algal genera had also been reported by the present group (Chakraborty et al 2006(Chakraborty et al , 2009Nayak et al 2006). Lengke et al (2006) have also reported bioconversion of gold nanoparticles (octahedral and sub-octahedral shapes) using the cyanobacterium Plectonema boryanum.…”

Section: Introductionsupporting

confidence: 81%

“…Previous studies reported purple or ruby-red color- Fig. 2 Hydrodynamic size distribution of biogenic gold nanoparticles as observed by DLS study, showing average nanoparticle diameter at around 435 nm ation of algal biomass due to the formation of spherical (<20 nm) gold nanoparticles at the intra-and extra cellular levels (Chakraborty et al 2006(Chakraborty et al , 2009Nayak et al 2006). Lengke et al (2006) reported reddish brown coloration by Plectonema thallus due to formation of amorphous gold nanoparticles.…”

Section: Discussionmentioning

confidence: 87%

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Gold nanorod production by cyanobacteria—a green chemistry approach

et al. 2011

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Intracellular bioconversion of auric ion (Au 3+ ) to gold nanorod (Au 0 ) by the cyanobacterium Nostoc ellipsosporum has been observed for the first time in laboratory condition. The nanorods were produced within the cell after exposing the healthy growing filaments to 15 mg L −1 gold (III) solution (pH 4.5) for 48 h at 20°C. The gold nanoparticles were extracted with sodium citrate solution and were subjected to UV-Visible spectroscopy. The characteristic surface-multiple plasmon bands at 560, 610, and 670 nm were observed. The nature and size of the particles were determined by transmission electron microscopy (TEM), dynamic light scattering (DLS), X-ray diffraction (XRD), and zeta potential studies. The nanorod size ranged from 137 to 209 nm in length and 33 to 69 nm in diameter. DLS study revealed the average hydrodynamic size as 435 nm and XRD study indicated the reduction of Au 3+ to Au 0 . Methods of extraction and preservation of gold nanorod particles have also been studied.

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Section: Introductionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 87%

Gold nanorod production by cyanobacteria—a green chemistry approach

et al. 2011

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“…Synthesis of nanogold has also been reported in algae, including Chlorella vulgaris (Ting et al, 1995), Sargassum wightii (Singaravelu et al, 2007) and Plectonema boryanum (Lengke et al, 2006a(Lengke et al, , 2006b). Gold nanoparticle synthesis by cyanobacteria (such as Lyngbya majuscula and Spirulina subsalsa), green algae (Rhizoclonium hieroglyphicum and R. riparium) and diatoms (Nitzschia obtusa and Navicula minima) has recently been reported by Chakraborty et al (2006Chakraborty et al ( , 2009 and Nayak et al (2006), and biosynthesis of gold nanorods by Nostoc ellipsosporum by Parial et al (2012).…”

Section: Introductionmentioning

confidence: 99%

Screening of different algae for green synthesis of gold nanoparticles

Parial

Patra

Dasgupta

et al. 2012

European Journal of Phycology

168

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The cyanobacteria Phormidium valderianum, P. tenue and Microcoleus chthonoplastes and the green algae Rhizoclonium fontinale, Ulva intestinalis, Chara zeylanica and Pithophora oedogoniana were exposed to hydrogen tetrachloroaurate solution and were screened for their suitability for producing nano-gold. All three cyanobacteria genera and two of the green algae (Rhizoclonium fontinale and Ulva intestinalis) produced gold nanoparticles intracellularly, confirmed by purple colouration of the thallus within 72 h of treatment at 20 C. Extracted nanoparticle solutions were examined by UV-vis spectroscopy, transmission electron microscopy (TEM) and X-ray diffractometry (XRD). XRD confirmed the reduction of Au (III) to Au (0). UV-vis spectroscopy and TEM studies indicated the production of nanoparticles having different shapes and sizes. Phormidium valderianum synthesized mostly spherical nanoparticles, along with hexagonal and triangular nanoparticles, at basic and neutral pHs (pH 9 and pH 7, respectively). Medicinally important gold nanorods were synthesized (together with gold nanospheres) only by P. valderianum at acidic pH (pH 5); this was initially determined by two surface plasmon bands in UV-vis spectroscopy and later confirmed by TEM. Spherical to somewhat irregular particles were produced by P. tenue and Ulva intestinalis (TEM studies). The UV-vis spectroscopy of the supernatant of other algal extracts indicated the formation of mostly spherical particles. Production of gold nanoparticles by algae is more ecofriendly than purely chemical synthesis. However, the choice of algae is important: Chara zeylanica and Pithophora oedogoniana were found to be unable to produce nanoparticles.

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“…Proteins, carbohydrates, enzymes and other molecules present in the cell membrane and cytoplasm of the fungal biomass of Neosartorya udagawae are responsible for stability and capping of AuNPs [19]. Earlier studies confirm the formation of AuNPs in intra and extra cellular reduction of Au (III) to Au (0) under similar conditions by the change of biomass color to purple [20][21][22][23][24]. The color of the solution is directly proportional to the concentration of biomass and aqueous gold solution.…”

Section: Resultsmentioning

confidence: 92%

Biosynthesis of Gold Nanoparticles by Biosorption Using Neosartorya Udagawae: Characterization and Invitro Evaluation

Lakshmi

Kannan²

2016

Int J Pharm Pharm Sci

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Objective: The present study was aimed to investigate gold nanoparticles synthesized by fungal isolate Neosartorya udagawae and determination of their stability in biofluids to probe their aptness in drug delivery applications. Methods:In this procedure, gold nanoparticles were prepared by biosynthesis using seven days old culture of Neosartorya udagawae and aqueous chloroauric acid. After the complete reaction, the fungal biomass was subjected to UV-Vis, XRD, FT-IR Spectrum analysis, TEM, Zeta potential, SEM and EDX analysis.Results: Intra/extracellular synthesis of gold nanoparticles was confirmed by a sharp peak at 526 nm in UV spectroscopy. SEM, TEM analysis demonstrates the spherical shape of AuNPs with an average diameter of 50 nm and XRD confirm the crystalline gold nanoparticles. FTIR analysis reveals the presence of the protein shell around the gold nanoparticles. The zeta potential value of AuNPs was-36mV which confirmed the stability of nanoparticles dispersion. Gold nanoparticles have shown high stability in biofluids of Bovine Serum Albumin and Phosphate Buffer Saline at pH-5, pH-7and pH-9 which mimic the human colonic biological environment. Conclusion:The fungal synthesis of AuNPs has been experimentally demonstrated and their stability in BSA, 10% NaCl and PBS at pH-7. This might be a promising option for drug delivery applications in carcinogenic colon disorders in human beings.

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Preconcentration of 198Au in a green alga, Rhizoclonium</p> </p>

Cited by 6 publications

References 0 publications

Gold nanorod production by cyanobacteria—a green chemistry approach

Gold nanorod production by cyanobacteria—a green chemistry approach

Screening of different algae for green synthesis of gold nanoparticles

Biosynthesis of Gold Nanoparticles by Biosorption Using Neosartorya Udagawae: Characterization and Invitro Evaluation

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