جستجوی مقالات مرتبط با کلیدواژه « silver nanoparticles » در نشریات گروه « منابع طبیعی »

To prevent chemical toxicity, biosynthesis of silver nanoparticles has been proposed as a cost-effective and environmentally friendly reducing agent option by corm extract of Crocus sativus var. Haussknechtii and as well as, evaluate their effects against Staphylococcus aureus and Escherichia coli. Research

Silver nanoparticles were produced in the presence of secondary metabolites of this plant. The nanoparticles were then identified using the technique ultraviolet-visible spectroscopy (UV–Vis), fourier transform infrared (FTIR), field emission scanning electron microscope (FESEM).The antibacterial properties were used against two microorganisms, S. aureus (Gram-positive) and E. coli (Gram-negative), using the agar well propagation method.

The observation of the peak at 450 nm in the UV-Vis spectra for corm synthesized silver nanoparticles reveals the reduction of silver metal ions into silver nanoparticles. The optimum pH and AgNO3 concentrations were 9 and 4 mM, respectively. FESEM images detected the spherical Ag-NPs shape with diverse sizes ranged within 70.70–192.02 nm. Additionally, based on the antibacterial test that has been done for nanoparticles, the mean diameter of the inhibition zone after exposure to S. aureus and E. coli was 22.67±0.58 and 20.00±00 mm, respectively. Limitations: There was no significant limitation to report. 

The corm extract of C. haussknechtii is a promising agent for the biosynthesis of almost spherical silver nanoparticles. The synthesized nanoparticles show good Inhibition activity in different concentrations. The AgNPs synthesized by corm extract in high concentrations are found to be high antibacterial activity against two bacterial organisms. This indicates that the increase in nanoparticle diameter is directly related to antimicrobial properties.

Our objective was to undertake the green synthesis of silver nanoparticles using Grapefruit (Citrus paradise) peel extract and evaluate the effects of silver nanoparticles on Botrytis cinerea.

The silver nanoparticles formation was evaluated at different temperatures and concentrations of AgNO3. The experiment was conducted during 2015 at Science and Research Branch, Islamic Azad University, Tehran, Iran.

Silver nanoparticles were successfully synthesized by Grapefruit's peel through a simple green and eco-friendly route. Aqueous extract of Grapefruit's peel was used synthesize nanosilver. The size of nanoparticle was determined at 5-65 nm, with SPR absorption at 420 nm in UV-Vis spectroscopy. Transmission electron microscopy (TEM) and X-ray diffraction spectroscopy (XRD) revealed that the synthesized nanoparticle was face centered. The silver nanoparticles characterized for their size and shape using scanning electron microscopy and TEM, respectively. XRD was used to determine the concentration of metal ions. Result indicated that nanosilver reduced the growth of Botrytis cinerea inviro culture. The highest antifungal effect was seen in the treatment with 40g/l nanosilver. In the other hand, the effect of nanosilver and time on diameter growth of Botrytis cinerea was not significant, individually (p≤1%).

No limitations were founded.

Green Synthesis of Nano is a reliable method for the nanoparticles synthesis and environmentally friendly approach.