Biogenic gold nanotriangles from Saccharomonospora sp., an endophytic actinomycetes of Azadirachta indica A. Juss.

Verma, Vijay C.; Anand, Smriti; Ulrichs, Christian; Singh, Santosh Kumar

doi:10.1186/2228-5326-3-21

Cited by 30 publications

(6 citation statements)

References 45 publications

(45 reference statements)

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“…Morphological analysis of nanoparticles revealed different shapes, varying from spherical to triangular and hexagonal. These results are in accordance with earlier reports of biosynthesis of gold nanoparticles from microbial flora [ 20 21 ].…”

Section: Resultssupporting

confidence: 94%

Endogenic mediated synthesis of gold nanoparticles bearing bactericidal activity

Baker

Prasad²,

Sardana

2016

J Microsc Ultrastruct

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The present investigation aimed to synthesize gold nanoparticles using Pseudomonas fluorescens 417 inhabiting Coffea arabica L. Biologically synthesized gold nanoparticles were polydispersed in nature and characterized using hyphenated techniques such as UV-visible spectrophotometry, which ascertained characteristic peaks between 450 nm and 650 nm. Fourier transform infrared analysis predicted the functional groups present in the cell-free supernatant that mediated the synthesis and stabilization of gold nanoparticles. The crystalline nature of the gold nanoparticles was analyzed with X-ray diffraction techniques that displayed the Bragg's diffraction intensity. Transmission electron microscopy revealed the size of nanoparticles ranging from 5 nm to 50 nm, with most of them bearing a spherical shape. The study also revealed the bactericidal activity of synthesized nanoparticles against a panel of clinically significant pathogens. Maximum activity was observed against Pseudomonas aeroginosa followed by Escherichia coli, Staphylococcus aureus, Bacillus subtilis, and Klebsiella pneumoniae. The results obtained in the present investigation are promising for ecofriendly approaches for synthesis of gold nanoparticles bearing bactericidal activity that can act as an alternative to combat drug-resistant pathogens.

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Section: Resultssupporting

confidence: 94%

Endogenic mediated synthesis of gold nanoparticles bearing bactericidal activity

Baker

Prasad²,

Sardana

2016

J Microsc Ultrastruct

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“…In effort to elucidate the mechanism of the biogenic synthesis of nanoparticles, the same authors have also investigated another endophytic actinomycetes Saccharomonospora sp. (Verma et al 2013 ). In this study, the authors have convincingly shown …”

Section: Microbial Endophytes In Nanoparticles Synthesissupporting

confidence: 50%

Myconanosynthesis: Redefining the Role of Microbial Endophytes

Singh

Ranjan

Singh

et al. 2013

Advances in Endophytic Research

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In recent years, a surge of interest was observed in synthesizing nanoparticles and other highly structured nanomaterials using microbes. Plenty of reports in cited domain claims synthesis of nanomaterials with desired shape, size and architecture through fungi, bacteria and actinomycetes. More precisely, fungi are frequently reported for their pivotal potential in bioreduction of the aqueous metal ions into their respective nanomaterials. The sporadic reports of nanomaterial synthesis from fungi led to the development of 'myconanotechnology' as a new domain of nanotechnology. This newly emerging domain of nanotechnology attracts not only the microbiologist but also material chemists and technologists, because of safe, sustainable and non-toxic 'green chemistry' associated with it. There is possibility of getting a total control over shape and size in a microbial system more easily than chemical methods. So far, a number of fungal strains have been reported for this potential among which some most common are Aspergillus , Fusarium , Colletotrichum , Penicillium , Verticillium , etc. However, the exact mechanism of this mycoreduction is not known so far, but it is speculated that fungal enzymes and/or metabolites are usually responsible for reduction of metal ions into their respective nanoparticles. Although many soil and pathogenic fungi have been reported as nano-factories of desired metals, relatively few reports are available about the synthesis of nanomaterials using fungal endophytes. It's surprising since fungal endophytes occupying the unusual habitat have potential to survive under stress conditions and thus must have set of enzymes and metabolites not found in

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“…The single-step biological synthesis of polycrystalline gold nanotriangles, using the extract of endophytic actinomycetes Saccharomonospora sp. ; has been reported by Verma et al [58]. However, the exact mechanism for this shape-oriented synthesis of nanostructured gold remains unclear.…”

Section: Biomineralization Of Goldmentioning

confidence: 80%

Forced Biomineralization: A Review

2021

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Biologically induced and controlled mineralization of metals promotes the development of protective structures to shield cells from thermal, chemical, and ultraviolet stresses. Metal biomineralization is widely considered to have been relevant for the survival of life in the environmental conditions of ancient terrestrial oceans. Similar behavior is seen among extremophilic biomineralizers today, which have evolved to inhabit a variety of industrial aqueous environments with elevated metal concentrations. As an example of extreme biomineralization, we introduce the category of “forced biomineralization”, which we use to refer to the biologically mediated sequestration of dissolved metals and metalloids into minerals. We discuss forced mineralization as it is known to be carried out by a variety of organisms, including polyextremophiles in a range of psychrophilic, thermophilic, anaerobic, alkaliphilic, acidophilic, and halophilic conditions, as well as in environments with very high or toxic metal ion concentrations. While much additional work lies ahead to characterize the various pathways by which these biominerals form, forced biomineralization has been shown to provide insights for the progression of extreme biomimetics, allowing for promising new forays into creating the next generation of composites using organic-templating approaches under biologically extreme laboratory conditions relevant to a wide range of industrial conditions.

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Biogenic gold nanotriangles from Saccharomonospora sp., an endophytic actinomycetes of Azadirachta indica A. Juss.

Cited by 30 publications

References 45 publications

Endogenic mediated synthesis of gold nanoparticles bearing bactericidal activity

Endogenic mediated synthesis of gold nanoparticles bearing bactericidal activity

Myconanosynthesis: Redefining the Role of Microbial Endophytes

Forced Biomineralization: A Review

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