Plant extract synthesized silver nanoparticles: An ongoing source of novel biocompatible materials

Rajan, Ramachandran; Krishnaraj, Chandran; Harper, Stacey L.; Yun, Soon‐Il; Kalaichelvan, P. T.

doi:10.1016/j.indcrop.2015.03.015

Cited by 365 publications

(168 citation statements)

References 123 publications

(212 reference statements)

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“…Biological resources available in nature including plants, fungi, yeast, actinomycetes and bacteria can be employed for synthesis of NPs, including silver and gold nanoparticles, which exhibited different biological activity [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Silver and gold nanoparticles synthesized from Streptomyces sp. isolated from acid forest soil with special reference to its antibacterial activity against pathogens

et al. 2016

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Biological systems such as bacteria, fungi or plants for synthesis of noble nanoparticles (NPs) are easy, inexpensive and eco-friendly. Obtained bioparticles due to its physico-chemical nature possess biologically active properties such as antimicrobial activity. In this study, the biological synthesis of silver (Ag) and gold (Au) nanoparticles using Streptomyces sp. strain NH21 isolated from acidic soil and its antibacterial activity against bacteria is presented. The physico-chemical properties of obtained particles were characterized. UV-Vis showed broad peak at 404 and 424 nm for AgNPs and 564 nm for AuNPs. Transmission electron microscopy studies showed small sized nanoparticles of 44 nm for supernatant and 8.4 nm for biomass synthesized AgNPs, and 10 nm for supernatant synthesized AuNPs, which was confirmed by nanoparticle tracking analyses. Fourier transform infrared spectroscopy revealed the presence of capping agents over metal-NPs. The negative Zeta potential values of metal-NPs indicated stability of biosynthesized particles. In vitro antibacterial activity and minimal inhibitory concentration of NPs was assessed against Gram-positive and Gram-negative bacteria. Unlike to gold-NPs, silver-NPs showed reliable antibacterial activity. Atomic force microscopy analysis recorded changes in cell morphology of tested bacterial strains after treatment with nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Silver and gold nanoparticles synthesized from Streptomyces sp. isolated from acid forest soil with special reference to its antibacterial activity against pathogens

et al. 2016

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“…Binding Energy (eV) 6.0 eV absence of a catalyst. The peak at 400 nm indicated that a 4-nitrophenolate anion was formed upon addition of NaBH4.…”

Section: Countsmentioning

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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“…Moreover, this method is environment friendly, cost effective and the biomolecules present themselves act as reducing as well as capping agents [6,10,15]. Synthesis of AgNPs through biological methods includes synthesis utilizing plants [1,16], microorganisms [17][18][19], egg shells [20], fish scales [21] and marine crabs [22]. Plant-based synthesis of AgNPs is better compared to other biological resources such as microorganisms due to faster rate of reaction and availability of the plant resources in abundance.…”

Section: Introductionmentioning

confidence: 99%

“…Plant-based synthesis of AgNPs is better compared to other biological resources such as microorganisms due to faster rate of reaction and availability of the plant resources in abundance. Moreover, plants are non-toxic, environment friendly, safe to handle, cost-effective and possess a wide variability of secondary metabolites which act as both natural reducing and capping agents in AgNPs synthesis [1,16,17]. However, microorganism-mediated synthesis of AgNPs possesses multi-step procedures like microbial isolation, culture preparation, maintenance, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have reported that biomolecules from plant extracts such as polyphenols, flavonoids, alkaloids, essential oils, proteins, enzymes, polysaccharides, etc. have the excellent power to reduce silver ions and effectively cape the produced AgNPs inhibiting agglomeration and thus providing good stability of the particle [5,16,17,23]. In this study, silver nanoparticles have been synthesized successfully using aqueous extract of leaves of Citrus maxima Merr.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Silver Nanoparticles using Aqueous Extract of Citrus maxima Leaf

Basumatary¹,

Changmai²

2018

Asian J. Chem.

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Plant-based synthesis of silver nanoparticles is an environmental friendly method which is gaining increasing attention among the researchers as plants are readily available, non-toxic, safe to handle, cost-effective and possess a wide variability of secondary metabolites which act as both natural reducing and capping agents in silver nanoparticles synthesis. In present study, silver nanoparticles have been synthesized successfully using aqueous extract of leaves of Citrus maxima Merr. Silver nanoparticles formed were characterized by ultraviolet-visible spectrophotometer, scanning electron microscopy, transmission electron microscopy, selected area electron diffraction pattern, EDX and FT-IR spectrometer. The synthesized nanoparticles are spherical in shape, polycrystalline nature and ranged from 2 to 25 nm in size. The leaf of Citrus maxima has a strong potential for environmental friendly synthesis of silver nanoparticles.

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Plant extract synthesized silver nanoparticles: An ongoing source of novel biocompatible materials

Cited by 365 publications

References 123 publications

Silver and gold nanoparticles synthesized from Streptomyces sp. isolated from acid forest soil with special reference to its antibacterial activity against pathogens

Silver and gold nanoparticles synthesized from Streptomyces sp. isolated from acid forest soil with special reference to its antibacterial activity against pathogens

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

Synthesis and Characterization of Silver Nanoparticles using Aqueous Extract of Citrus maxima Leaf

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