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
Citations
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Microbial synthesis of gold nanoparticles: Current status and future prospects
TL;DR: The microbial synthesis, properties and biomedical applications of gold nanoparticles are discussed and different microbial synthesis strategies used so far for obtaining better yield and stability have been described.
Journal ArticleDOI
A review on the biosynthesis of metallic nanoparticles (gold and silver) using bio-components of microalgae: Formation mechanism and applications.
P. Dheeban Shankar,Sutha Shobana,Indira Karuppusamy,Arivalagan Pugazhendhi,Vijayan Sri Ramkumar,Sundaram Arvindnarayan,Gopalakrishnan Kumar,Gopalakrishnan Kumar +7 more
TL;DR: The reports are revealing the fact that the cell free extracts are highly exploited for the synthesis than the biomass, which is associated with the problem of recovering the particles.
Journal ArticleDOI
Algae-mediated biosynthesis of inorganic nanomaterials as a promising route in nanobiotechnology – a review
Si Amar Dahoumane,Mourad Mechouet,Kushlani Wijesekera,Carlos D. M. Filipe,Clémence Sicard,Dennis A. Bazylinski,Clayton Jeffryes +6 more
TL;DR: In this paper, the authors present a review of the role of algae in the production of nanomaterials, focusing on the diversity of algal strains exploited in the booming field of nanobiotechnology and green chemistry, the various methodologies through which these diverse organisms are used, and the variety of fabricated materials composed of noble metals, oxides and chalcogenides.
Journal ArticleDOI
Algae as crucial organisms in advancing nanotechnology: a systematic review
Aishwarye Sharma,Aishwarye Sharma,Shruti Sharma,Kuldeep Sharma,Siva K. Chetri,Amit Vashishtha,Pushpa Singh,Ravindra Kumar,Brijesh Rathi,Veena Agrawal +9 more
TL;DR: This review article is focused on recent progress on the utilization of algae of various classes, viz., Cyanophyceae, ChlorophyCEae, Phaeophyceiae, RhodophyceAE, etc. for the synthesis of nanoparticles, their characterization and the possible mechanisms involved.
Journal ArticleDOI
Screening of different algae for green synthesis of gold nanoparticles
TL;DR: 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.
References
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Bioreduction of chloroaurate ions by geranium leaves and its endophytic fungus yields gold nanoparticles of different shapes
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