pH Dependent changes in the optical properties of carboxylic acid derivatized silver colloidal particles

Sastry, Murali; Mayya, K. S.; Bandyopadhyay, K.

doi:10.1016/s0927-7757(97)00087-3

Cited by 247 publications

(142 citation statements)

References 23 publications

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“…Furthermore, recent studies by Burygin et al revealed that Au NPs have no enhancing effect on the antibacterial activity of gentamycin [26]. In this study, no significant difference was observed between antibacterial activity of antibiotics alone and their mixture with Au NPs.…”

Section: Resultscontrasting

confidence: 54%

“…527 nm. This peak is assigned to a surface plasmon phenomenon that is well documented for various metal nanoparticles with sizes ranging from 2 to 100 nm [25][26][27]. Figure 2 shows representative TEM images recorded from the drop-coated film of the as-prepared Au NPs, synthesized by treating the chloroauric acid solution with a tannin-free ethanol extract of black tea (left picture) after 15 min.…”

Section: Resultsmentioning

confidence: 81%

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The combination effects of trivalent gold ions and gold nanoparticles with different antibiotics against resistant Pseudomonas aeruginosa

et al. 2012

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Despite much success in drug design and development, Pseudomonas aeruginosa is still considered as one of the most problematic bacteria due to its ability to develop mutational resistance against a variety of antibiotics. In search for new strategies to enhance antibacterial activity of antibiotics, in this work, the combination effect of gold materials including trivalent gold ions (Au 3+ ) and gold nanoparticles (Au NPs) with 14 different antibiotics was investigated against the clinical isolates of P. aeruginosa, Staphylococcus aureus and Escherichia coli. Disk diffusion assay was carried out, and test strains were treated with the sub-inhibitory contents of gold nanomaterial. Results showed that Au NPs did not increase the antibacterial effect of antibiotics at tested concentration (40 μg/disc). However, the susceptibility of resistant P. aeruginosa increased in the presence of Au 3+ and methicillin, erythromycin, vancomycin, penicillin G, clindamycin and nalidixic acid, up to 147 %. As an individual experiment, the same group of antibiotics was tested for their activity against clinical isolates of S. aureus, E. coli and a different resistant strain of P. aeruginosa in the presence of sub-inhibitory contents of Au 3+, where Au 3+ increased the susceptibility of test strains to methicillin, erythromycin, vancomycin, penicillin G, clindamycin and nalidixic acid. Our finding suggested that using the combination of sub-inhibitory concentrations of Au 3+ and methicillin, erythromycin, nalidixic acid or vancomycin may be a promising new strategy for the treatment of highly resistant P. aeruginosa infections.

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Section: Resultscontrasting

confidence: 54%

Section: Resultsmentioning

confidence: 81%

The combination effects of trivalent gold ions and gold nanoparticles with different antibiotics against resistant Pseudomonas aeruginosa

et al. 2012

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“…Observation of this strong but broad surface plasmon peak has been well documented for various Ag-NPs size. [37][38][39] Transmission electron microscopy (TEM) images of the AgNPs solution which showed different size of Ag-NPs (Figure 2) were recorded using a Zeiss Electron Microscope 10, operating at power 60 kV. TEM samples were prepared by dispersing 2 -3 drops of Ag-NPs solution on copper grid and dried at room temperature after removal of excess solution using a filter paper.…”

Section: Staphylococcus Aureusmentioning

confidence: 99%

Silver Nanoparticles Effect on Antimicrobial and Antifungal Activity of New Heterocycles

Kandile¹,

Zaky²,

Mohamed³

et al. 2010

Bulletin of the Korean Chemical Society

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In this study 1-[4-(2-methoxy benzyl)-6-aryl-pyridazin-3(2H)-ylidene] hydrazines were used for the synthesis of new heterocyclic systems such as thiazolidine, phthalazine, pyrazolo, tetrazolo, hydrazide and new pyridazine derivatives to explore the effect of silver nanoparticles on their biological activity efficiency. Structures of the new heterocycles were characterized by the aid of several analytical techniques including; 1 H-NMR, FTIR and mass spectra. Silver nanoparticles were synthesized by a simple methodology and the formation of silver nanoparticles was confirmed by transmission electron microscopy (TEM) and UV studies. Most of the new prepared heterocycles were evaluated in vitro as new antimicrobial agents. Combination effects of the silver nanoparticles on the antimicrobial activity of the new heterocycles were investigated using the disk diffusion method. Compound 10a exhibited the strongest enhancing effect of silver nanoparticles solution against Aspergillus flavus and Candida albicans.

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“…The UV-Vis spectrograph of the colloidal solution of bionanoparticles was recorded. The technique outlined above appears to be very useful for the analysis of nanoparticles (Sastry et al, 1997(Sastry et al, , 1998.…”

Section: Resultsmentioning

confidence: 99%

Biopotential of Verbesina encelioides (stem and leaf powders) in silver nanoparticle fabrication

Bhati-Kushwaha¹,

Malik²

2013

Turk J Biol

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Nanotechnology has opened new opportunities in the field of medical sciences and pharmaceuticals. Commercially, nanoparticles are in great demand in electronics, catalysis, chemistry, energy, and medicine. Today in nanoparticle production green synthesis, using biological material including medicinal plants as a starting material, is in vogue. In the present investigation the powder extract (stems and leaves) of an important medicinal plant, Verbesina encelioides, was used for the biosynthesis of bionanoparticles. The synthesized nanoparticles were screened and characterized by UV-visible spectrophotometer, scanning electron microscopy, X-ray diffraction, and FTIR analyses. The particles were then subjected to antimicrobial assay. Comparative analyses of the antimicrobial behavior of aqueous, ethanolic, and methanolic extracts and bionanoparticles against 2 bacteria (Escherichia coli and Vibrio cholerae) and 2 fungi (Aspergillus niger and A. flavus) are described.

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pH Dependent changes in the optical properties of carboxylic acid derivatized silver colloidal particles

Cited by 247 publications

References 23 publications

The combination effects of trivalent gold ions and gold nanoparticles with different antibiotics against resistant Pseudomonas aeruginosa

The combination effects of trivalent gold ions and gold nanoparticles with different antibiotics against resistant Pseudomonas aeruginosa

Silver Nanoparticles Effect on Antimicrobial and Antifungal Activity of New Heterocycles

Biopotential of Verbesina encelioides (stem and leaf powders) in silver nanoparticle fabrication

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