Synthesis of anisotropic silver nanoparticles using novel strain, Bacillus flexus and its biomedical application

Priyadarshini, S.; Gopinath, V.; Priyadharsshini, N. Meera; MubarakAli, D.; Velusamy, P.

doi:10.1016/j.colsurfb.2012.08.018

Cited by 294 publications

(127 citation statements)

References 28 publications

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“…The biosynthesized AgNPs displayed maximum absorbance at the wavelength of 436 nm (Fig. 2), which falls within the reported range of 391-440 nm for AgNPs (Thirumurugan et al 2011;Zaki et al 2011;Kannan et al 2013;Priyadarshini et al 2013;Lateef et al 2015a). It was observed that dilution ratio of 1:40 (extract:AgNO 3 solution), and pH 8.5 produced highest yield of AgNPs with maxima absorbance readings at 436 nm (Figs.…”

Section: Biosynthesis and Characterization Of Agnpssupporting

confidence: 83%

“…10 Antifungal activities of synthesized AgNPs on fungi inoculated into emulsion paint Appl Nanosci (2016Nanosci ( ) 6:863-874 871 et al 2004Nanosci ( , 2005Nanosci ( , 2006Nanosci ( , 2007Nanosci ( , 2010Lateef and Ojo 2015). The antibacterial activities of AgNPs as obtained in this study have been reported in previous studies (Priyadarshini et al 2013;Kanmani and Lim 2013;Salem et al 2014;Shankar et al 2014;Lateef et al 2015a). The antibacterial activities of AgNPs have been attributed to the interaction of AgNPs with sulphur and phosphorus containing biomolecules in the bacterial cell.…”

Section: Antimicrobial Activities Of Biosynthesized Agnpssupporting

confidence: 66%

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Cobweb as novel biomaterial for the green and eco-friendly synthesis of silver nanoparticles

et al. 2015

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In this study, spider cobweb as a novel biomaterial was used for the green synthesis of silver nanoparticles (AgNPs). The synthesized AgNPs were characterized using UV-Vis spectroscopy, Fourier-transform infrared spectroscopy (FTIR), and transmission electron microscopy. The efficacy of biosynthesized particles as antibacterial agents was evaluated using multidrug resistant clinical bacterial isolates through sensitivity testing with AgNPs and combination of AgNPs with some selected antibiotics. In addition, the potential application of the particles as additives in paints was demonstrated using some bacterial and fungal isolates. The synthesized AgNPs which were dark brown in color displayed maximum absorbance at the wavelength of 436 nm. It was observed that the reaction mixture of 1:40 (extract:AgNO 3 solution) at pH of 8.5 produced particles with maximum absorbance at 436 nm. The FTIR spectrum showed peaks at 3298, 2359, 2089, and 1635 cm -1 , indicating that proteins were the capping and stabilization molecules in the synthesis of AgNPs. The particles were spherical in shape with size ranging about 3-50 nm. The energy-dispersive X-ray analysis showed the presence of silver as the most prominent metal, while the selected area electron diffraction pattern conformed to the face-centered cubic phase and crystalline nature of AgNPs. The AgNPs inhibited the growth of several bacterial isolates including S. aureus, E. coli, Klebsiella granulomatis and P. aeruginosa in the range of 10-17 mm at concentration of 100 lg/ml. It was also demonstrated that AgNPs potentiated the activities of augmentin, ofloxacin and cefixime in the AgNP-antibiotic synergy studies. Similarly, the inclusion of AgNPs as additive in white emulsion paint led to the total inhibition of growth of E. coli, P. aeruginosa, Aspergillus niger and A. fumigatus. To the best of our knowledge, this is the first report of the use of cobweb for the green synthesis of AgNPs. The immense antimicrobial activities of the particles can be explored in the creation of novel products, where it can be used as additive to protect materials against microbial attack.

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Section: Biosynthesis and Characterization Of Agnpssupporting

confidence: 83%

Section: Antimicrobial Activities Of Biosynthesized Agnpssupporting

confidence: 66%

Cobweb as novel biomaterial for the green and eco-friendly synthesis of silver nanoparticles

et al. 2015

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“…Studies have reported supernatants of Bacillus cereus, Bacillus subtilis, Bacillus licheniformis, E. coli, Enterobacter cloacae, Klebsiella pneumonia, Lactobacillus acidophilus, Staphylococcus aureus, and Pseudomonas aeruginosa to induce synthesis of AgNPs. 35 Priyadarshini et al 36 recently reported Bacillus flexus S-27 as a potential candidate for extracellular synthesis Figure 1 Formation of reactive oxygen species (ROS) and disruption to membrane functionality by nanosilver. Notes: Antibacterial activities from silver are due to the formation of ROS and disruption of membrane functionality.…”

Section: Nanoparticlesmentioning

confidence: 99%

Antibacterial properties and toxicity from metallic nanomaterials

Vimbela¹,

Ngo²,

Fraze³

et al. 2017

IJN

496

334

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The era of antibiotic resistance is a cause of increasing concern as bacteria continue to develop adaptive countermeasures against current antibiotics at an alarming rate. In recent years, studies have reported nanoparticles as a promising alternative to antibacterial reagents because of their exhibited antibacterial activity in several biomedical applications, including drug and gene delivery, tissue engineering, and imaging. Moreover, nanomaterial research has led to reports of a possible relationship between the morphological characteristics of a nanomaterial and the magnitude of its delivered toxicity. However, conventional synthesis of nanoparticles requires harsh chemicals and costly energy consumption. Additionally, the exact relationship between toxicity and morphology of nanomaterials has not been well established. Here, we review the recent advancements in synthesis techniques for silver, gold, copper, titanium, zinc oxide, and magnesium oxide nanomaterials and composites, with a focus on the toxicity exhibited by nanomaterials of multidimensions. This article highlights the benefits of selecting each material or metal-based composite for certain applications while also addressing possible setbacks and the toxic effects of the nanomaterials on the environment.

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“…Furthermore, the optical characteristics, such as peak width and absorption are mainly depend on the other factors including: size, shape, medium, surface charge, the interaction between the particle composition, refractive index of the surrounding medium, particle stability, and surface-adsorbed species (28)(29)(30). There are numerous reports regarding extracellular synthesis of the AgNPs by Bacillus species generated with the different sizes (31,32,36,37). Also, in 2008 two studies have been reported on the synthesis of AgNPs using Bacillus licheniformis by Kalishwaralal et al (13,19).…”

Section: Discussionmentioning

confidence: 99%

Green Extracellular Synthesis of the Silver Nanoparticles Using Thermophilic Bacillus Sp. AZ1 and its Antimicrobial Activity Against Several Human Pathogenetic Bacteria

Deljou

Goudarzi

2016

Iran J Biotechnol

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Synthesis of anisotropic silver nanoparticles using novel strain, Bacillus flexus and its biomedical application

Cited by 294 publications

References 28 publications

Cobweb as novel biomaterial for the green and eco-friendly synthesis of silver nanoparticles

Cobweb as novel biomaterial for the green and eco-friendly synthesis of silver nanoparticles

Antibacterial properties and toxicity from metallic nanomaterials

Green Extracellular Synthesis of the Silver Nanoparticles Using Thermophilic Bacillus Sp. AZ1 and its Antimicrobial Activity Against Several Human Pathogenetic Bacteria

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