Silver Nanoparticles and Their Antimicrobial Activity on a Few Bacteria

Das, Ratan; Saha, Mitu; Hussain, Syed Arshad; Nath, S.

doi:10.1007/s12668-012-0070-5

Cited by 8 publications

(8 citation statements)

References 29 publications

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“…Colloidal particles are receiving augmented attention as an important starting point for the fabrication of micro-and nanostructures due to their attractive physical and chemical properties which differ considerably from the bulk phase [1]. The integration of nanomaterials with biology has led to the development of diagnostic devices, various analytical tools, therapeutic applications, and drug delivery vehicles [2]. Silver nanoparticles (AgNPs) have high reactivity due to the large surface to volume ratio and play a crucial role in inhibiting bacterial growth in aqueous and solid media.…”

Section: Introductionmentioning

confidence: 99%

Biosynthesis of Silver Nanoparticles by Marine Invertebrate (Polychaete) and Assessment of Its Efficacy against Human Pathogens

Singh

Sahu

Thangaraj

2014

Journal of Nanoparticles

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Synthesis of metallic nanoparticles by chemical and physical method makes the process often cumbersome due the usage of toxic and expensive chemicals. The present study reports the biosynthesis of silver nanoparticles using marine invertebrate (polychaete) extract at room temperature. The ultraviolet-visible (UV-Vis) spectroscopy revealed the formation of silver nanoparticles (AgNPs) by exhibiting the typical surface plasmon absorption maximum at 418-420 nm. Structure and composition of AgNPs were analyzed by atomic force microscopy (AFM). Average particle size of AgNPs ranged from 40 to 90 nm, confirmed by scanning electron microscopy (SEM) analysis. The energy-dispersive X-ray spectroscopy (EDX) of the nanoparticles dispersion confirmed the presence of elemental silver signal, whereas X-ray diffraction (XRD) substantiated the crystalline nature of synthesized nanoparticle. Fourier transform infrared spectroscopy (FTIR) spectral analysis showed the presence of amides phenols, ethers, and fatty acids as major biomolecules responsible for the reduction of silver ions. The possible mechanism responsible for the synthesis of AgNPs by these biomolecules was also illustrated by chemical reactions. The synthesized AgNPs showed comparatively good antibacterial activity against the tested human pathogens. This study advocates that not only plants and microbes but also marine invertebrates do have potential for synthesizing nanoparticles by a cost-effective and eco-friendly approach.

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Section: Introductionmentioning

confidence: 99%

Biosynthesis of Silver Nanoparticles by Marine Invertebrate (Polychaete) and Assessment of Its Efficacy against Human Pathogens

Singh

Sahu

Thangaraj

2014

Journal of Nanoparticles

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“…The antibacterial activity of synthesized ligand-free CdS and Ag/CdS nanocrystals have been investigated against E. coli (Gram-negative bacteria) and S. aureus (Gram-positive bacteria) by the Kirby-Bauer diffusion method [5,9,10,12]. To test the antibacterial activity, at first, CdS and Ag/CdS nanocrystals laden disk of different concentrations have been prepared.…”

Section: Analysis Of Antibacterial Activitymentioning

confidence: 99%

“…Nowadays, there are many antibiotic-resistant microorganisms and that number is increasing day by day, along with a continuous increase in the health care cost, which led many to find out or develop a new way of overcoming the resistances of different microorganisms with low cost. Recently many researchers [5,9,10,12] have started working on the antibacterial activity of different nanomaterials. It is reported that many noble metal nanocrystals especially silver and their composite can act as a good antibacterial agent, which does not show any resistance to bacteria [5,[9][10][11][12]36].…”

Section: Antibacterial Activity Of Cds and Ag/cds Nanocrystalsmentioning

confidence: 99%

“…Recently many researchers [5,9,10,12] have started working on the antibacterial activity of different nanomaterials. It is reported that many noble metal nanocrystals especially silver and their composite can act as a good antibacterial agent, which does not show any resistance to bacteria [5,[9][10][11][12]36]. Very recently, a few authors started working on the antibacterial activity of a few semiconductor-based nanomaterials [13,14].…”

Section: Antibacterial Activity Of Cds and Ag/cds Nanocrystalsmentioning

confidence: 99%

“…These antimicrobial properties of different nanocrystals can be used in textile industries, in pharmaceuticals, as a food packaging material and disinfectants, and also especially can be used for water purification systems [8]. Many authors reported the antibacterial activity of silver nanocrystals, copper nanocrystals, and also of other metals composites [9][10][11][12] and these nanomaterials show better antibacterial activity without becoming resistant to microorganism. But, in recent years, only a few authors have reported the antibacterial activity of semiconductor nanocrystals [13,14].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhancement of antibacterial activity of synthesized ligand‐free CdS nanocrystals due to silver doping

et al. 2020

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Recently, different nanocrystals have been reported to be the alternative, optimistic, and novel antimicrobial agent against the many antibiotic‐resistant bacteria. Here, ligand‐free CdS and Ag‐doped CdS (Ag/CdS) nanocrystals have been synthesized by chemical methods for the study of the antimicrobial activity on Escherichia coli and Staphylococcus aureus by Kirby–Bauer diffusion method to see the effect against Gram‐positive and Gram‐negative bacteria. These prepared nanocrystals have been characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD). TEM and SEM images confirm the spherical morphology of both the sample and the respective XRD patterns indicate polycrystalline nature having a cubic zinc blende structure. Antibacterial activities have been tested with CdS and Ag/CdS, considering concentrations ranging from 10 to 200 μg/ml. After 24 h of incubation, the zone of inhibition (ZOI) is measured for each concentration, which shows that both the nanocrystals are ineffective against E. coli but much effective against S. aureus at this low concentration range. Furthermore, Ag/CdS nanocrystals have been found to show much more ZOI than CdS. Differences in the antibacterial activity can be due to the presence of different cell wall in E. coli and S. aureus.

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Influence of Silver, Zinc Oxide and Copper Oxide Nanoparticles on the Cyanobacterium Calothrix elenkinii

et al. 2018

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Silver Nanoparticles and Their Antimicrobial Activity on a Few Bacteria

Cited by 8 publications

References 29 publications

Biosynthesis of Silver Nanoparticles by Marine Invertebrate (Polychaete) and Assessment of Its Efficacy against Human Pathogens

Biosynthesis of Silver Nanoparticles by Marine Invertebrate (Polychaete) and Assessment of Its Efficacy against Human Pathogens

Enhancement of antibacterial activity of synthesized ligand‐free CdS nanocrystals due to silver doping

Influence of Silver, Zinc Oxide and Copper Oxide Nanoparticles on the Cyanobacterium Calothrix elenkinii

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