scholarly journals Leaf Extract Arbitrated Biogenic Synthesis of Silver Nanospheres by a Medicinal Plant from the Western Ghats with Enhanced Antimicrobial Property

Photochem ◽  
2021 ◽  
Vol 1 (2) ◽  
pp. 264-274
Author(s):  
John Sherin ◽  
Puvanesvaran Senthil Kumar ◽  
Swaminathan Karuthapandian
Keyword(s):  
Silver Nanoparticles ◽  
Methyl Orange ◽  
Antimicrobial Property ◽  
Research Work ◽  
Ultra Violet ◽  
Blue Shift ◽  
Synthesis Process ◽  
Operational Parameters ◽  
Ag Nps ◽  
Methyl Orange Dye

In the present study, we report the greener, simple, cost effective, non-hazardous and ecofriendly synthesis of silver (Ag) nanoparticles from Alstonia scholaris (L.) R. Br. for the first time. The synthesis of silver nanoparticles using the leaf stock acted as a reducing as well as the capping agent simultaneously. The bio-reduced silver nanoparticles were characterized using ultra violet-visible spectroscopy (UV) exhibiting blue shift absorption peak in the region 440 nm. The newly synthesized Ag NPs were sphere-like in structure and grew well with a crystalline size of 16.57 nm. The Fourier transform infrared (FT-IR) analysis identifies the biomolecules which are involved during the synthesis process. The synthesized nanocatalyst served as a good catalyst for degrading methyl orange dye under solar light irradiation and was monitored spectrophotometrically. Furthermore, the antimicrobial potential of Ag NPs was evaluated an could competently inhibit different pathogenic organisms, including bacteria and fungi. Additionally, the efficiency of the silver nanoparticles was tested against the photocatalytic degradation of methyl orange dye pollutant. Different operational parameters such as catalyst weight dosage, dye concentration and different pH were optimized. The pollutants were degraded within 35 min. The present research work opens a pathway to synthesize nanomaterial by applying the principles of green chemistry.

scholarly journals Biosynthetic potential assessment of four food pathogenic bacteria in hydrothermally silver nanoparticles fabrication

2019 ◽  
Vol 8 (1) ◽  
pp. 629-634 ◽  
Author(s):  
Amir Rahimirad ◽  
Afshin Javadi ◽  
Hamid Mirzaei ◽  
Navideh Anarjan ◽  
Hoda Jafarizadeh-Malmiri
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Zeta Potential ◽  
Pathogenic Bacteria ◽  
Heating Time ◽  
Synthesis Process ◽  
Ag Nps ◽  
Physico Chemical ◽  
Minimum Particle Size ◽  
Particle Size Analyzer

Abstract Silver nanoparticles (Ag NPs) were synthesized using four pathogenic bacterial extracts namely, Bacillus cereus, E. coli, Staphylococcus aureus and Salmonella entericasubsp.enterica. Synthesis process were hydrothermally accelerated using temperature, pressure and heating time of 121°C, 1.5 bar ad 15 min. Physico- chemical characteristics of the fabricated Ag NPs, including, particle size, polydispersity index (PDI), zeta potential, broad emission peak (λmax) and concentration were evaluated using UV-Vis spectrophotometer and dynamic light scattering (DLS) particle size analyzer. Furthermore, main existed functional groups in the provided bacterial extracts were recognized using Fourier transform infrared spectroscopy. The obtained results revealed that two main peaks were detected around 3453 and 1636.5 cm-1, for all bacterial extracts, were interrelated to the stretching vibrations of hydroxyl and amide groups which those had key roles in the reduction of ions and stabilizing of the formed Ag NPs. The results also indicated that, Ag NPs with much desirable characteristics, including minimum particle size (25.62 nm) and PDI (0.381), and maximum zeta potential (-29.5 mV) were synthesized using S. e. subsp. enterica extract. λmax, absorbance and concentration values for the fabricated Ag NPs with this bacterial extract were 400 nm, 0.202% a.u. and 5.87 ppm.

Raman Scattering of Light by Molecules of Methyl Orange Dye on the Surface of Silicon Containing Ion-Synthesized Silver Nanoparticles

2018 ◽  
Vol 124 (5) ◽  
pp. 649-654 ◽  
Author(s):  
V. V. Vorob’ev ◽  
A. M. Rogov ◽  
Yu. N. Osin ◽  
N. N. Brandt ◽  
V. I. Nuzhdin ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Methyl Orange ◽  
Raman Scattering ◽  
Scattering Of Light ◽  
Methyl Orange Dye

scholarly journals Effect of β-Cyclodextrin Stabilized Silver Nanoparticles on Gills, Kidney, Liver of Danio rerio

2021 ◽  
Vol 11 (1) ◽  
pp. 2981-2995
Keyword(s):  
Silver Nanoparticles ◽  
Danio Rerio ◽  
Morphological Changes ◽  
Antimicrobial Property ◽  
Research Work ◽  
Model Organism ◽  
Histopathological Study ◽  
Histopathological Studies ◽  
Kidney Liver ◽  
Drug Studies

The silver nanoparticles (AgNP) are applied broadly in medical applications due to their antimicrobial property. However, the toxicity (uptake, translocation, and accumulation) of these AgNPs nanomaterial has not been much explored. Also, cyclodextrin has been used for different pharmaceutical applications due to its various potential properties. Therefore, the toxicity of these AgNPs and cyclodextrin in the model organism such as Danio rerio could be crucial for future nano-drug studies. The main aim of the present research work is to synthesize, characterize biopolymeric silver nanoparticles, and perform histopathological studies of synthesized silver nanoparticles on Danio rerio. The silver nanoparticles of 130nm size have been synthesized successfully using β-Cyclodextrin (β-CD) at room temperature. The various analytical applied to characterized the β-Cyclodextrin (β-CD) reduced silver nanoparticles (β-CD)-SNPs. A histopathological study has been conducted to evaluate the toxicity effect of the synthesized (β-CD)-SNP on the animal model Danio rerio. The (β-CD)-SNPs conc. 30µl/l is affecting and damaged gills and kidney the Danio rerio organs (gills, kidney) exposed after 10 days, yet the liver was found to be healthy. In conclusion, the Danio rerio gills, kidneys, and liver are sensitive to the 130nm-sized (β-CD)-SNPs. The nanoparticles' toxicity depends on concentration; less concentration (30µl/l) accumulates and is absorbed efficiently than the higher concentration (300µl/l). However, no morphological changes were observed on Danio rerio.

scholarly journals Effectiveness of Green Synthesized Silver Nanoparticles (Ag-Nps) of Delonix Regia Pods in Water Disinfection

2019 ◽  
Vol 9 (1) ◽  
pp. 2543-2547
Keyword(s):  
Silver Nanoparticles ◽  
Contact Time ◽  
Research Work ◽  
Extended Period ◽  
Water Disinfection ◽  
Ag Nps ◽  
Delonix Regia ◽  
Silver Nps ◽  
Bacteria And Fungi ◽  
Green Synthesized Silver Nanoparticles

Particles of sizes between 1 and 100 nanometers are known as nanoparticles. The natural materials like plant leaf extract, bacteria and fungi for the synthesis of silver nanoparticles has numerous benefits. In this scenario, the main objective of this work is to utilize Delonix Regia pod extract for the synthesis of silver nanoparticles (NPs) and check its feasibility as disinfectant. Pod extract prepared was subjected to EDS analysis. Transformed silver NPs are coated onto GAC(1.5mm) and subjected to SEM analyses. Column study was carried to check the disinfecting action of silver NPs for varied contact time by monitoring MPN value. From this research work, it can be concluded as, for pod extract, peak absorbance was found at 360nm. Delonix Regia pod extract transforms into silver nanoparticles moderately to about 4.63-8.85%. Silver nanoparticles are coated onto Activated Carbon, dried and stored for extended period without loss of nanoparticles. At 30min contact time efficiency was found to be 63% and 71 for NP2.5 and NP5 respectively. Green synthesized silver nanoparticles are proved to be moderately effective in disinfecting contaminated water.

scholarly journals Silver Nanoparticles Formation by Nanosecond Pulsed Laser Irradiation in an Aqueous Solution of Silver Nitrate; Effect of Sodium bis (2-ethyl hexyl) Sulfosuccinate

2021 ◽  
Vol 24 (1) ◽  
pp. 38-42
Author(s):  
Umair Yaqub Qazi
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nitrate ◽  
Critical Concentration ◽  
Nitrate Solution ◽  
Pulsed Laser ◽  
Single Layer ◽  
Ultra Violet ◽  
Medical Diagnostics ◽  
Ag Nps ◽  
Photochemical Reduction

A photochemical reduction of a silver salt precursor using near-ultra-violet (UV) pulsed laser (355 nm) irradiation into aqueous surfactant sodium-bis (2–ethylhexyl) sulfosuccinate (AOT) solution has succeeded in synthesizing homogenous speculative silver nanoparticles (Ag NPs). Without using any additive, the irradiation from ns laser pulses to aqueous silver nitrate solution was observed to create nanocubes (NCs). The photoproduct was transformed into a nanosphere when irradiated with a particular AOT concentration. The photoproduct concentration of NCs to NSs was approximately ten times lower than the critical concentration of micellar (CMC) in AOT, which means that the growth of NSs was aided in a single layer of AOT adsorbed on silver surfaces. A UV / Visible Spectrophotometer and Transmission/Scanning electron microscopy (TEM/SEM) were used to characterize the photochemically synthesized sample thoroughly. The mean size of AgNSs, analyzed by TEM, was 8 nm. These parameters have shown the growth of AgNSs and discussed in the paper. These nanoparticles are potential candidates for catalyst, semiconductor, photovoltaic equipment, medical diagnostics applications than bulk materials.

A NOVEL SYNTHESIS METHOD FOR SILVER NANOPARTICLES USING MOLTEN ε-CAPROLACTAM AS SOLVENT AND REDUCING AGENT

NANO ◽  
2014 ◽  
Vol 09 (08) ◽  
pp. 1450085
Author(s):  
PENG LI ◽  
HOUSHENG XIA ◽  
GUISHENG YANG
Keyword(s):  
Silver Nanoparticles ◽  
Synthesis Method ◽  
Reducing Agent ◽  
Synthesis Process ◽  
Precipitation Reaction ◽  
X Ray Diffraction ◽  
Ag Nps ◽  
Transmission Electron ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

A precipitation–reduction synthesis method for silver nanoparticles ( Ag NPs) was developed. Molten ε-caprolactam (CL) was used not only as solvent but also as reducing agent and stabilizer. At first, Ag 2 O NPs was prepared by precipitation reaction of silver nitrate ( AgNO 3) and sodium hydroxide ( NaOH ) using molten CL as solvent at 100°C. Then, Ag 2 O NPs was in situ reduced into Ag NPs by molten CL at 120°C. Techniques of X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to monitor the synthesis process. With the increase of reduction time, monodispersed Ag 2 O NPs (ca. 3.7 nm) were integrated and larger Ag NPs (10–90 nm) were formed. Fourier transform infrared (FT-IR) results showed that the surface of Ag NPs was capped with about 0.9 wt.% of CL molecules. Surface enhanced Raman scattering (SERS) effect of Ag NPs was investigated using Rhodamine 6G as a probe molecule.

scholarly journals Study on Synthesis and Antibacterial Properties of Ag NPs/GO Nanocomposites

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Lei Huang ◽  
Hongtao Yang ◽  
Yanhua Zhang ◽  
Wei Xiao
Keyword(s):  
Silver Nanoparticles ◽  
Graphene Oxide ◽  
Antibacterial Properties ◽  
Antibacterial Activities ◽  
Structure Characterization ◽  
Synthesis Process ◽  
Phase Method ◽  
Ag Nps ◽  
Selected Area Electron Diffraction ◽  
20 Nm

Using graphene oxide as substrate and stabilizer for the silver nanoparticles, silver nanoparticles-graphene oxide (Ag NPs/GO) composites with different Ag loading were synthesized through a facile solution-phase method. During the synthesis process, AgNO3on GO matrix was directly reduced by NaBH4. The structure characterization was studied through X-ray diffraction (XRD), atomic force microscopy (AFM), high-resolution transmission electron microscope (HRTEM), ultraviolet-visible spectroscopy (UV-Vis), and selected area electron diffraction (SAED). The results show that Ag nanoparticles (Ag NPs) with the sizes ranging from 5 to 20 nm are highly dispersed on the surfaces of GO sheets. The shape and size of the Ag NPs are decided by the volume of initial AgNO3solution added in the GO. The antibacterial activities of Ag NPs/GO nanocomposites were investigated and the result shows that all the produced composites exhibit good antibacterial activities against Gram-negative (G−) bacterial strainEscherichia coli(E. coli) and Gram-positive (G+) strainStaphylococcus aureus(S. aureus). Moreover, the antibacterial activities of Ag NPs/GO nanocomposites gradually increased with the increasing of volume of initial AgNO3solution added in the GO and this improvement of the antibacterial activities results from the combined action of size effect and concentration effect of Ag NPs in Ag NPs/GO nanocomposites.

Sign in / Sign up

Export Citation Format

Share Document