Extracellular synthesis of silver nanoparticles by the Bacillus strain CS 11 isolated from industrialized area

Das, Vidhya Lakshmi; Thomas, Roshmi; Varghese, Rintu; Soniya, E. V.; Mathew, Jyothis; Radhakrishnan, E. K.

doi:10.1007/s13205-013-0130-8

Cited by 273 publications

(149 citation statements)

References 24 publications

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“…Therefore Shaverdi et al were able to create AgNPs in 5 minutes, without the need for a cell lysis step by the use of culture supernatant. This extracellular type of formation is a more desirable not only because of the simplicity of purification but also due to the observed increased production rate [33].…”

Section: Nanoparticle Synthesis By Bacteriamentioning

confidence: 99%

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Biological Synthesis of Metallic Nanoparticles by Bacteria, Fungi and Plants

Pantidos¹

2014

J Nanomed Nanotechnol

484

221

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Over the past few decades interest in metallic nanoparticles and their synthesis has greatly increased. This has resulted in the development of numerous ways of producing metallic nanoparticles using chemical and physical methods. However, drawbacks such as the involvement of toxic chemicals and the high-energy requirements of production make it difficult for them to be widely implemented. An alternative way of synthesising metallic nanoparticles is by using living organisms such as bacteria, fungi and plants. This "green" method of biological nanoparticle production is a promising approach that allows synthesis in aqueous conditions, with low energy requirements and low-costs. This review gives an overview of some of these environmentally friendly methods of biological metallic nanoparticle synthesis. It also highlights the potential importance of these methods in assessing nanoparticle risk to both health and the environment.techniques, which are generally low-cost and high-volume. However, the need for toxic solvents and the contamination from chemicals used in nanoparticle production limit their potential use in biomedical applications [15]. Therefore a "green", non-toxic way of synthesising metallic nanoparticles is needed in order to allow them to be used in a wider range of industries. This could potentially be achieved by using biological methods.Many bacteria, fungi and plants have shown the ability to synthesise metallic nanoparticles and all have their own advantages and disadvantages (Table 1) [16][17][18]. Intracellular or extracellular synthesis, growth temperature, synthesis time, ease of extraction and percentage synthesised versus percentage removed from sample ratio, all play an important role in biological nanoparticle production. Finding the right biological method can depend upon a number of variables. Most importantly, the type of metal nanoparticle under investigation is of vital consideration, as in general organisms have developed resistance against a small number of metals, potentially limiting the choice of organism. However synthetic biology; a nascent field of science, is starting to address these issues in order to create more generalised chassis, able to synthesise more than one type of metallic nanoparticle using the same organism [19]."Natural" biogenic metallic nanoparticle synthesis can be split into two categories. The first is bioreduction, in which metal ions are chemically reduced into more stable forms biologically. Many organisms have the ability to utilise dissimilatory metal reduction, in which the reduction of a metal ion is coupled with the oxidation of an enzyme [20]. This results in stable and inert metallic nanoparticles that can then be safely removed from a contaminated sample. The second category is biosorption. This involves the binding of metal ions from Journal of Nanomedicine & Nanotechnology J o u rna l of N a n o m ed icine & N a n o te chnolo g y

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Section: Nanoparticle Synthesis By Bacteriamentioning

confidence: 99%

“…Although extracellular formation has its advantages, such as lowercost, simpler downstream processing [33], intracellular formation can also be of great importance. In the case of bioremediation, heavy metals such as Cu and Pt need to be removed from contaminated environments.…”

Section: Nanoparticle Synthesis By Fungimentioning

confidence: 99%

Biological Synthesis of Metallic Nanoparticles by Bacteria, Fungi and Plants

Pantidos¹

2014

J Nanomed Nanotechnol

484

221

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“…It is now established that the plants and plant materials act as excellent reducing agents that catalyze bulk materials into nano form.Biological methods of nanoparticles production are regarded as safe, cost-effective, sustainable and environment friendly. Several biological systems including bacteria, fungi, algae and plants have been used in the synthesis of AgNPs [ 5,6,7,8 ].Nanoparticles produced by these methods have protective bio-capping around them, rendering the particles to be stable with no aggregation [ 9 ]. Synthesis of inorganic nanoparticles by biological systems makes nanoparticles more biocompatible and environmentally benign [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Phytofabrication of silver nanoparticles using Myriostachya wightiana as a novel bioresource, and evaluation of their biological activities

Vadlapudi

Amanchy

2017

Braz. arch. biol. technol.

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Nanobiotechnology deals with the properties of nanomaterials and their potential uses. Here we report for the first time novel, cost-effective and eco-friendly method for the rapid green synthesis of silver nanoparticles (AgNPs) using leaf extracts of Myriostachya wightiana. The growth of silver nanoparticles was monitored by UV-vis spectroscopy complemented by Zeta potential, dynamic light scattering technique (DLS), Fouriertransform infrared spectroscopy (FTIR), Transmission electron microscope (TEM) and X-ray diffraction (XRD).The surface plasmon resonance (SPR)

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“…However, reports have suggested that the extracellular enzyme secreted by microorganism in the culture supernatant is responsible for the reduction of silver ions to silver nanoparticles. 25,26 The study based on extracellular synthesis of silver nanoparticles by Bacillus licheniformis showed that the nitrate reductase enzyme extracellularly secreted by the bacteria in the medium was responsible for the synthesis of silver nanoparticles. 8 For the characterization of the silver nanoparticles, the reaction mixture was monitored by using UV-Vis spectrophotometer for spectral analysis.…”

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confidence: 99%

Biosynthesis, characterization, and antimicrobial applications of silver nanoparticles

Singh

Kim

Singh

et al. 2015

IJN

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In the present study, the strain Brevibacterium frigoritolerans DC2 was explored for the efficient and extracellular synthesis of silver nanoparticles. These biosynthesized silver nanoparticles were characterized by ultraviolet-visible spectrophotometry, which detected the formation of silver nanoparticles in the reaction mixture and showed a maximum absorbance at 420 nm. In addition, field emission transmission electron microscopy revealed the spherical shape of the nanoparticles. The dynamic light scattering results indicated the average particle size of the product was 97 nm with a 0.191 polydispersity index. Furthermore, the product was analyzed by energy dispersive X-ray spectroscopy, X-ray diffraction, and elemental mapping, which displayed the presence of elemental silver in the product. Moreover, on a medical platform, the product was checked against pathogenic microorganisms including Vibrio parahaemolyticus , Salmonella enterica , Bacillus anthracis , Bacillus cereus , Escherichia coli , and Candida albicans . The nanoparticles demonstrated antimicrobial activity against all of these pathogenic microorganisms. Additionally, the silver nanoparticles were evaluated for their combined effects with the commercial antibiotics lincomycin, oleandomycin, vancomycin, novobiocin, penicillin G, and rifampicin against these pathogenic microorganisms. These results indicated that the combination of antibiotics with biosynthesized silver nanoparticles enhanced the antimicrobial effects of antibiotics. Therefore, the current study is a demonstration of an efficient biological synthesis of silver nanoparticles by B. frigoritolerans DC2 and its effect on the enhancement of the antmicrobial efficacy of well-known commercial antibiotics.

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Extracellular synthesis of silver nanoparticles by the Bacillus strain CS 11 isolated from industrialized area

Cited by 273 publications

References 24 publications

Biological Synthesis of Metallic Nanoparticles by Bacteria, Fungi and Plants

Biological Synthesis of Metallic Nanoparticles by Bacteria, Fungi and Plants

Phytofabrication of silver nanoparticles using Myriostachya wightiana as a novel bioresource, and evaluation of their biological activities

Biosynthesis, characterization, and antimicrobial applications of silver nanoparticles

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