Intracellular synthesis of silver nanoparticle by actinobacteria and its antimicrobial activity

Otari, Sachin V.; Patil, Rahul; Ghosh, Sourja; Thorat, Nanasaheb D.; Pawar, S.H.

doi:10.1016/j.saa.2014.10.003

Cited by 137 publications

(65 citation statements)

References 27 publications

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“…The obtained result indicates that the treatment of AgNO 3 with NaOH might produce Ag 2 O which on subsequent heating produces the AgNPs (Gallardo et al, 2012). The absorption spectrum of AgNPs showed a SPR at 405 nm, indicating the formation of AgNPs, which is consistent with previous literature (Otari, Patil, Ghosh, Thorat, & Pawar, 2015). It is a well-known phenomenon that the position and shape of the AgNPs SPR depends on the particle size, shape and dielectric constant of the surrounding medium (Cheng & Neiss, 2012;Schlücker, 2009).…”

Section: Resultssupporting

confidence: 89%

Synthesis of fibrinolytic active silver nanoparticle using wheat bran xylan as a reducing and stabilizing agent

Harish

Uppuluri

Veerappan

2015

Carbohydrate Polymers

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Section: Resultssupporting

confidence: 89%

Synthesis of fibrinolytic active silver nanoparticle using wheat bran xylan as a reducing and stabilizing agent

Harish

Uppuluri

Veerappan

2015

Carbohydrate Polymers

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“…The recent advancements in the field of nanotechnology have made AgNPs to be widely used as a novel therapeutic agent as antibacterial, antifungal, antiviral, anti-inflammatory and anti-cancerous agents (Otari et al, 2015). On the other hand stable colloidal solutions of AgNPs were found to be effective against Aspergillus and Penicillium (Gajbhiye et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Honey mediated silver nanoparticles and their inhibitory effect on aflatoxins and ochratoxin A

El-Desouky¹,

Ammar²

2016

J App Pharm Sci

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Silver nanoparticles (AgNPs) have potential antimicrobial activity against bacteria and fungi. The synthesis of AgNPs have been reported using several chemical and physical methods which are not friendly environment. Therefore, our technique has focused on the synthesis of AgNPs by natural compounds. The aim of this study has been to synthesis AgNPs by safe nontoxic method using Egyptian honey (EH) as reducing and capping agents and to investigate its ability to reduce the mycelial growth and the production of aflatoxins (AFs) and ochratoxin A (OTA) by Aspergillus flavus and Aspergillus ochraceus, respectively. AgNPs have been characterized by UV-Visible Spectrophotometer, Dynamic Light Scattering (DLS), Fourier Transform Infrared Spectroscopy (FTIR), and Transmission Electron Microscope (TEM).The obtained results indicated that the synthesis of honey AgNPs depends on the concentration of bulk metal (AgNO3) used in the synthesis process. The TEM image has revealed the formation of spherical well dispersed AgNPs, while the main size of AgNPs detected by DSL is 9.9 nm. Our results have indicated that 3 mg -100 ml media of honey derived AgNPs have reduced the aflatoxin (AF) G1, G2, B1 andB2 production by A. parasiticus to 77.55, , 62.91, 58.76 and 66.56%, respectively and ochratoxin A (OTA) by A. ochraceus to 79.85 % with significantly inhibitory effect on mycelial growth. The percentage of reduction depends on the AgNPs concentration.

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“…The mixture was stirred continuously for 2 days. At predetermined intervals (1,3,5,24, and 48 h), portions of the reaction mixture were immediately taken and diluted 50-fold to measure the surface plasmon resonance (SPR), size, and zeta potential. Table 1 summarizes the synthesis conditions used to prepare the TMCN-AgNPs.…”

Section: Green Synthesis Of Tmcn-capped Silver Nanoparticles (Tmcn-agmentioning

confidence: 99%

Trimethylchitosan-Capped Silver Nanoparticles with Positive Surface Charge: Their Catalytic Activity and Antibacterial Spectrum Including Multidrug-Resistant Strains of <em>Acinetobacter baumannii</em>

Chang

Chen

Cheng

et al. 2017

Preprint

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Abstract:We report a facile route for the green synthesis of trimethylchitosan nitrate-capped silver nanoparticles (TMCN-AgNPs) with positive surface charge. In this synthesis, silver nitrate, glucose, and trimethyl chitosan nitrate (TMCN) were used as silver precursor, reducing agent, and stabilizer, respectively. The reaction was carried out in a stirred basic aqueous medium at room temperature without the use of energy-consuming or expensive equipment. We investigated the effects of the concentrations of NaOH, glucose, and TMCN on the particle size, zeta potential, and formation yield. The AgNPs were characterized by UV-visible spectroscopy, photon correlation spectroscopy, laser Doppler anemometry, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The catalytic activity of the TMCN-AgNPs was studied by the reduction of 4-nitrophenol using NaBH4 as a reducing agent. We evaluated the antibacterial effects of the TMCN-AgNPs on Acinetobacter baumannii, Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus aureus using the broth microdilution method. The results showed that both gram-positive and gram-negative bacteria were killed by the TMCN-AgNPs at very low concentration (< 6.13 μg/mL). Moreover, the TMCN-AgNPs also showed high antibacterial activity against clinically isolated multidrug-resistant A. baumannii strains, and the minimum inhibitory concentration (MIC) was ≤ 12.25 μg/mL.

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Intracellular synthesis of silver nanoparticle by actinobacteria and its antimicrobial activity

Cited by 137 publications

References 27 publications

Synthesis of fibrinolytic active silver nanoparticle using wheat bran xylan as a reducing and stabilizing agent

Synthesis of fibrinolytic active silver nanoparticle using wheat bran xylan as a reducing and stabilizing agent

Honey mediated silver nanoparticles and their inhibitory effect on aflatoxins and ochratoxin A

Trimethylchitosan-Capped Silver Nanoparticles with Positive Surface Charge: Their Catalytic Activity and Antibacterial Spectrum Including Multidrug-Resistant Strains of <em>Acinetobacter baumannii</em>

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