Synthesis and characterization of silver/montmorillonite/chitosan bionanocomposites by chemical reduction method and their antibacterial activity

Shameli, Kamyar; Ahmad, Mansor Bin; Zargar, Mohsen; Yunus, Wan Md Zin Wan; Ibrahim, Nor Azowa; Shabanzadeh, Parvaneh; Ghaffari‐Moghaddam, Mansour

doi:10.2147/ijn.s16043

Cited by 138 publications

(81 citation statements)

References 65 publications

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“…In Figure 6D, the peaks around 1.3, 3.1, 3.3, and 3.4 keV are related to the silver elements in the C. longa. 29 Additionally, the EDXRF spectra for the Ag/C. longa confirmed the presence of Ag-NPs in the tuber-powder extraction without any impurity peaks.…”

Section: Morphology Studymentioning

confidence: 69%

Green biosynthesis of silver nanoparticles using Curcuma longa tuber powder

Shameli

Ahmad

Zamanian

et al. 2012

IJN

Self Cite

318

164

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Green synthesis of noble metal nanoparticles is a vastly developing area of research. Metallic nanoparticles have received great attention from chemists, physicists, biologists, and engineers who wish to use them for the development of a new-generation of nanodevices. In this study, silver nanoparticles were biosynthesized from aqueous silver nitrate through a simple and eco-friendly route using Curcuma longa tuber-powder extracts, which acted as a reductant and stabilizer simultaneously. Characterizations of nanoparticles were done using different methods, which included ultraviolet-visible spectroscopy, powder X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy-dispersive X-ray fluorescence spectrometry, and Fourier-transform infrared spectroscopy. The ultraviolet-visible spectrum of the aqueous medium containing silver nanoparticles showed an absorption peak at around 415 nm. Transmission electron microscopy showed that mean diameter and standard deviation for the formation of silver nanoparticles was 6.30 ± 2.64 nm. Powder X-ray diffraction showed that the particles are crystalline in nature, with a face-centered cubic structure. The most needed outcome of this work will be the development of value-added products from C. longa for biomedical and nanotechnology-based industries.

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Section: Morphology Studymentioning

confidence: 69%

Green biosynthesis of silver nanoparticles using Curcuma longa tuber powder

Shameli

Ahmad

Zamanian

et al. 2012

IJN

Self Cite

318

164

View full text Add to dashboard Cite

show abstract

“…The EDX pattern (Fig. 6b) showed the predominant presence of silver in the AgNP solution (Shameli et al 2011;Salem et al 2014) with the characteristic ring-like SAED pattern (Fig. 6c) typical of the face-centered cubic crystalline structure of silver (Shankar et al 2014).…”

Section: Biosynthesis and Characterization Of Agnpsmentioning

confidence: 99%

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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“…1 indicating the formation of Ag nanoparticles [2]. The intense colors are suggested due to the localized surface plasmon resonance (LSPR) absorption of silver nanoparticles [26].…”

Section: Synthesis Of Silver-chitosan Nanocomposites Colloidalmentioning

confidence: 99%

“…However in this experiment, optimal molar ratio is 1:8. This synthesis required high amount of glucose than the reaction stoichiometry possibly because some silver ions were so trapped in the chitosan linkages that hindering the contact with glucose [2].…”

Section: Effect Of Naoh Amount On Lspr Bandsmentioning

confidence: 99%

“…For application, nanocomposite may be used in different forms, such us colloids, powders, fibers, membranes and film. Incorporation of silver nanoparticles into biopolymer chitosan resulting in silver-chitosan nanocomposites is interesting to study due to their high antibacterial activity [2][3]. They can be synthesized using various methods, such as chemical reduction [3][4], electrochemical [5], γ-radiation, [6] photochemical [7] and laser ablation [8].…”

Section: Introductionmentioning

confidence: 99%

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