scholarly journals Comparative Study on Bactericidal Effect of Silver Nanoparticles, Synthesized Using Green Technology, in Combination with Antibiotics on Salmonella Typhi

2012 ◽  
Vol 03 (04) ◽  
pp. 480-485 ◽  
Author(s):  
Shweta Rajawat ◽  
Mohammad Shums Qureshi
Keyword(s):  
Silver Nanoparticles ◽  
Comparative Study ◽  
Bactericidal Effect ◽  
Salmonella Typhi ◽  
Green Technology

Green Synthesis of Silver Nanoparticles by Allamanda cathartica L. Leaf Extract and Evaluation for Antimicrobial Activity

2013 ◽  
Vol 6 (4) ◽  
pp. 2260-2268
Author(s):  
M. Linga Rao ◽  
Bhumi G ◽  
Savithramma N
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Fusarium Species ◽  
Inhibition Zone ◽  
Fungal Species ◽  
Green Technology ◽  
Metallic Silver ◽  
Synthesis Of Nanoparticles ◽  
Aqueous Leaf Extract

Silver nanoparticles (SNPs) exhibit tremendous applications in medicine as antimicrobial agent.  The use of different parts of plants for the synthesis of nanoparticles is considered as a green technology as it does not involve any harmful chemicals.  In the present study, we report a rapid biosynthesis of silver nanoparticles from aqueous leaf extract of medicinal plant Allamanda cathartica.  The active phytochemicals present in the plant were responsible for the quick reduction of silver ion to metallic silver nanoparticles. The reduced silver nanoparticles were characterized by using UV-Vis spectrophotometry, Scanning Electron Microscope (SEM), Energy Dispersive Analysis of X-ray (EDAX) and Atomic Force Microscopy (AFM).  The spherical shaped silver nanoparticles were observed and it was found to 19-40 nm range of size.  These phytosynthesized SNPs were tested for their antimicrobial activity and it analyzed by measuring the inhibitory zone. A. cathartica aqueous leaf extract of SNPs showed highest toxicity to Pseudomonas followed by Klebsiella, Bacillus and E. coli and lowest toxicity towards Proteus. In fungal species, highest inhibition zone was noted against Rhizopus followed by Curvularia, Aspergillus flavus and Aspergillus niger and minimum inhibition zone was observed against Fusarium species.  These results suggest a promising potential of Indian plant-based green chemistry for production of SNPs for biomedical and nanotechnology applications.

scholarly journals A comparative study of silver nanoparticle dissolution under physiological conditions

2020 ◽  
Vol 2 (12) ◽  
pp. 5760-5768
Author(s):  
Lukas Steinmetz ◽  
Christoph Geers ◽  
Sandor Balog ◽  
Mathias Bonmarin ◽  
Laura Rodriguez-Lorenzo ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Comparative Study ◽  
Silver Nanoparticle ◽  
Biologically Relevant ◽  
Physiological Conditions ◽  
Aggregation Behaviour

The dissolution and aggregation behaviour of silver nanoparticles under physiological conditions and in biologically relevant environments is investigated by exploiting their plasmonic properties.

scholarly journals Biosynthesis, Characterization, and Biological Activities of Procyanidin Capped Silver Nanoparticles

2020 ◽  
Vol 11 (3) ◽  
pp. 66
Author(s):  
Umar M. Badeggi ◽  
Jelili A. Badmus ◽  
Subelia S. Botha ◽  
Enas Ismail ◽  
Jeanine L. Marnewick ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Food Packaging ◽  
Antioxidant Activities ◽  
Biological Activities ◽  
Bacterial Species ◽  
Bactericidal Effect ◽  
Total Extract ◽  
Selected Area Electron Diffraction ◽  
Ic50 Values ◽  
Inhibitory Activities

In this study, procyanidin dimers and Leucosidea sericea total extract (LSTE) were employed in the synthesis of silver nanoparticles (AgNPs) and characterized by ultraviolet-visible (UV-Visible) spectroscopy, high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), X-ray diffraction (XRD), and dynamic light scattering (DLS) techniques. AgNPs of about 2–7 nm were obtained. DLS and stability evaluations confirmed that the AgNPs/procyanidins conjugates were stable. The formed nanoparticles exhibited good inhibitory activities against the two enzymes studied. The IC50 values against the amylase enzyme were 14.92 ± 1.0, 13.24 ± 0.2, and 19.13 ± 0.8 µg/mL for AgNPs coordinated with LSTE, F1, and F2, respectively. The corresponding values for the glucosidase enzyme were 21.48 ± 0.9, 18.76 ± 1.0, and 8.75 ± 0.7 µg/mL. The antioxidant activities were comparable to those of the intact fractions. The AgNPs also demonstrated bacterial inhibitory activities against six bacterial species. While the minimum inhibitory concentrations (MIC) of F1-AgNPs against Pseudomonas aeruginosa and Staphylococcus aureus were 31.25 and 15.63 µg/mL respectively, those of LSTE-AgNPs and F2-AgNPs against these organisms were both 62.50 µg/mL. The F1-AgNPs demonstrated a better bactericidal effect and may be useful in food packaging. This research also showed the involvement of the procyanidins as reducing and capping agents in the formation of stable AgNPs with potential biological applications.

The bactericidal effect of silver nanoparticles

2005 ◽  
Vol 16 (10) ◽  
pp. 2346-2353 ◽  
Author(s):  
Jose Ruben Morones ◽  
Jose Luis Elechiguerra ◽  
Alejandra Camacho ◽  
Katherine Holt ◽  
Juan B Kouri ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Bactericidal Effect

Study on the synthesis of antibacterial plastic by using silver nanoparticles doped in zeolite framework

2021 ◽  
Vol 6 (1) ◽  
pp. 32-36
Author(s):  
Anh Quoc Le ◽  
Van Phu Dang ◽  
Ngoc Duy Nguyen ◽  
Kim Lan Nguyen Thi ◽  
Kim Lang Vo Thi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Average Particle Size ◽  
Bactericidal Effect ◽  
Ethanol Solution ◽  
Average Particle ◽  
Γ Irradiation ◽  
Zeolite Framework ◽  
Ion Exchange Reaction ◽  
Transmission Electron

Silver nanoparticles (AgNPs) doped in the zeolite framework (AgNPs/Z) were successfully synthesized by γ-irradiation in ethanol solution of silver ion-zeolite (Ag+/Z) prepared by ion exchange reaction between silver nitrate (AgNO3) and zeolite 4A. The effects of the Ag+ concentration and irradiation dose on the formation of AgNPs/Z were also investigated. AgNPs/Z with the silver content of about 10,000 ppm and the average particle size of AgNPs of about 27 nm was characterized by ultraviolet-visible spectroscopy, powder X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM). Firstly, AgNPs/Z was added into PP resins for creation of PP-AgNPs/Z masterbatch (Ag content of ~10.000 ppm) and then PP-AgNPs/Z plastics were preapared by mixing masterbatch with PP resins. The antibacterial activity of the PP-AgNPs/Z plastics was investigated against Gram-negative bacteria Escherichia coli (E. coli). The results showed that PP-AgNPs/Z plastic contained 100 ppm of Ag possessed a high antibacterial property, namely the bactericidal effect was more than 96 % on the platic surface. In conclusion, possessing many advantages such as: vigorously antibacterial effect and good dispersion in plastic matrix, AgNPs/Z is promising to be applied as bactericidal agent for plastic industry.

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