Journal ArticleDOI
Biorecovery of gold using cyanobacteria and an eukaryotic alga with special reference to nanogold formation – a novel phenomenon
TLDR
Pro- and eukaryotic algal genera, i.e. Lyngbya majuscula, Spirulina subsalsa, and Rhizoclonium hieroglyphicum were used for bio-recovery of gold out of aqueous solution indicating quick metabolic independent binding of Au to the algae followed by active accumulation and subsequent reduction.Abstract:
Pro- and eukaryotic algal genera, i.e. Lyngbya majuscula, Spirulina subsalsa (Cyanophyceae) and Rhizoclonium hieroglyphicum (Chlorophyceae), were used for bio-recovery of gold (Au) out of aqueous solution. Au (III) spiked with 198Au was used for the experiment. Batch laboratory experiments indicated quick metabolic independent binding of Au to the algae followed by active accumulation and subsequent reduction. Gold accumulation by different algal genera was found in order of R. hieroglyphicum > L. majuscula > S. subsalsa (3.28, 1.93 and 1.73 mg g-1, respectively). It was observed that the algal biomass and the media used for the experiment turned purple in colour indicating reduction of Au (III) to Au (0) at intra- and extracellular level. This was confirmed by TEM studies of L. majuscula biomass exposed in HAuCl4 solution where <20-nm-sized gold particles were found both inside as well as on the surface of the cell. Up to 90–100% of accumulated gold was recovered from the algal biomass by using nitric acid and acidic thiourea solution.read more
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Microalga Scenedesmus sp.: A Potential Low-Cost Green Machine for Silver Nanoparticle Synthesis
Jayashree Jena,Nilotpala Pradhan,Rati Ranjan Nayak,Bishnu Prasad Dash,Lala Behari Sukla,Prasanna Kumar Panda,Barada Kanta Mishra +6 more
TL;DR: Intracellular and extracellular biogenic syntheses of silver nanoparticles (SNPs) using the unicellular green microalgal biomass provides a simple, cost-effective alternative template for the biosynthesis of nanomaterials in a large-scale system that could be of great use in biomedical applications.
Journal ArticleDOI
Biomineralization mechanism of gold by zygomycete fungi Rhizopus oryzae.
TL;DR: The biosynthesis mechanism of gold nanoparticles (AuNPs) in the fungus Rhizopus oryzae is described, showing that at higher Au(III) concentrations, both mycelial and protein yield decrease and damages to the cellular ultrastructure are observed, likely due to the toxic effect of Au( III).
Journal ArticleDOI
Biosynthesis of gold nanoparticles using diatoms—silica-gold and EPS-gold bionanocomposite formation
TL;DR: In this paper, a novel synthesis of gold nanoparticles, EPS-gold, and silica-gold bionanocomposites by biologically driven processes employing two diatom strains (Navicula atomus, Diadesmis gallica) is described.
Journal ArticleDOI
An Overview of the Algae-Mediated Biosynthesis of Nanoparticles and Their Biomedical Applications
Rimsha Chaudhary,Khadija Nawaz,Amna Komal Khan,Christophe Hano,Bilal Haider Abbasi,Sumaira Anjum +5 more
TL;DR: The rationale behind the algal-mediated biosynthesis of metallic, metallic oxide, and bimetallic NPs from various algae have been reviewed and an insight into the mechanism of biosynthesis from algae and their biomedical applications has been reviewed critically.
Journal ArticleDOI
Chlorococcum sp. MM11—a novel phyco-nanofactory for the synthesis of iron nanoparticles
Vidhyasri Subramaniyam,Suresh R. Subashchandrabose,Palanisami Thavamani,Mallavarapu Megharaj,Zuliang Chen,Ravi Naidu +5 more
TL;DR: In this article, a green synthesis of iron nanoparticles using a soil microalga, Chlorococcum sp. MM11, and their application in chromium remediation have been investigated.
References
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Molecular tectonics in biomineralization and biomimetic materials chemistry
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Journal ArticleDOI
Bioreduction of chloroaurate ions by geranium leaves and its endophytic fungus yields gold nanoparticles of different shapes
TL;DR: The use of geranium leaves and its endophytic fungus in the extra-cellular synthesis of gold nanoparticles and the possibility of achieving nanoparticle shape control in a host leaf–fungus system is potentially exciting.