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.

Pulsed-laser Irradiation to Suspended Carbon Particles in Aqueous Silver Nitrate Solution

2008 ◽  
Vol 37 (8) ◽  
pp. 818-819 ◽  
Author(s):  
Yoshiko Miura ◽  
Kazuko Yui ◽  
Hiroshi Uchida ◽  
Kiyoshi Itatani ◽  
Seiichiro Koda
Keyword(s):  
Silver Nitrate ◽  
Laser Irradiation ◽  
Nitrate Solution ◽  
Pulsed Laser ◽  
Silver Nitrate Solution ◽  
Carbon Particles ◽  
Pulsed Laser Irradiation

Controlling the Surface Plasmon Absorption of Silver Nanoparticles via Green Synthesis Using Pennisetum purpureum Leaf Extract

2018 ◽  
Vol 772 ◽  
pp. 73-77
Author(s):  
Ruelson S. Solidum ◽  
Arnold C. Alguno ◽  
Rey Capangpangan
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Silver Nitrate ◽  
Surface Plasmon ◽  
Leaf Extract ◽  
Nitrate Solution ◽  
Silver Nitrate Solution ◽  
Absorption Peak ◽  
Plasmon Absorption ◽  
Surface Plasmon Absorption

We report on the green synthesis of silver nanoparticles utilizing theP.purpureumleaf extract. Controlling the surface plasmon absorption of silver nanoparticles was achieved by regulating the amount of extract concentration and the molarity of silver nitrate solution. The surface plasmon absorption peak is found at around 430nm. The surface plasmon absorption peak have shifted to lower wavelength as the amount of extract is increased, while plasmon absorption peak shifts on a higher wavelength as the concentration of silver nitrate is increased before it stabilized at 430nm. This can be explained in terms of the available nucleation sites promoted by the plant extract as well as the available silver ions present in silver nitrate solution.

scholarly journals Effects of Momordica Charantia Silver Nanoparticles on the expressions of Genes Associated With Lipid Metabolism and Nephrotoxicity in Streptozotocin-Induced Rats

2021 ◽  
Vol 37 (2) ◽  
pp. 126-133
Author(s):  
O.O Elekofehinti ◽  
M.O Akinjiyan
Keyword(s):  
Diabetes Mellitus ◽  
Silver Nanoparticles ◽  
Lipid Metabolism ◽  
Silver Nitrate ◽  
Nitrate Solution ◽  
Diabetic Control ◽  
Untreated Group ◽  
Rt Pcr ◽  
Hmg Coa Reductase ◽  
Coa Reductase

Hyperlipidemia and hyperglycemia have been implicated in diabetes mellitus (DM) leading to complications such as nephropathy. Medicinal plants like Mormodica charantia (MC) have been used in the treatment of DM over the years but little is known about their mechanisms of action. This study used biotechnology tools to investigate and compare the effects of M. charantia silver nanoparticles (MCSNPs) with M. charantia extract on expressions of genes linked with nephrotoxicity, lipid and glucose metabolisms using reverse-transcriptase polymerase chain reaction (RT-PCR) in streptozotocin-induced diabetic rats. The genes investigated include kidney injury molecule-1 (KIM-1), 3-hydroxyl, 3-methyl glutaryl_coA reductase (HMG-CoA reductase), peroxisome proliferator-activated receptor alpha and gamma (PPARα and PPARγ). Synthesis of MCSNPs was done using 1 mM concentration of aqueous silver nitrate solution at ratio 1:9 (v/v). Experimental rats were induced intraperitoneally with streptozotocin (65 mg/kg) and divided into six groups viz: diabetic control; normal control; silver nitrate (10 mg/kg); MCSNPs (50 mg/kg); Metformin (100 mg/kg) and M. charantia fraction (100 mg/kg). Sacrifice was done after 12 days of treatment and RT-PCR was then used to investigate gene expressions in liver and kidney tissues of the rats. The expression of HMG-CoA reductase gene was significantly upregulated (p<0.05) upon treatment with 50 mg/kg MCSNPs relative to the diabetic untreated group. M. charantia extracts and MCSNPs significantly upregulate (p<0.05) the expressions of PPAR-α and PPAR-γ compared to the diabetic control. Also, a significant (p<0.05) down-regulation of KIM-1 mRNA expression was observed in MCSNPs- treated group, relative to the diabetes untreated group. M. charantia silver nanoparticles could be a potent antidiabetic agent due to its potential to modulate genes associated with lipid metabolism and nephrotoxicity. Keywords: Medicinal plant; Diabetes Mellitus; Silver Nanoparticles; nephrotoxicity; gene expression

scholarly journals The Synthesis and Stability Study of Silver Nanoparticles Prepared by Using p-Aminobenzoic Acid as Reducing and Stabilizing Agent

2018 ◽  
Vol 18 (3) ◽  
pp. 421 ◽  
Author(s):  
Dian Susanthy ◽  
Sri Juari Santosa ◽  
Eko Sri Kunarti
Keyword(s):  
Silver Nanoparticles ◽  
Reaction Time ◽  
Silver Nitrate ◽  
Tap Water ◽  
Nitrate Solution ◽  
Silver Nitrate Solution ◽  
Stability Study ◽  
Synthesis Process ◽  
Aminobenzoic Acid ◽  
Stabilizing Agent

A study to examine the performance of p-aminobenzoic acid as both reducing agent for silver nitrate to silver nanoparticles (AgNPs) and stabilizing agent for the formed AgNPs has been done. The synthesis of AgNPs was performed by mixing silver nitrate solution as precursor with p-aminobenzoic acid solution and heating it in a boiling water bath. After the solution turned to yellow, the reaction stopped by cooling it in tap water. The formed AgNPs were analyzed by using UV-Vis spectrophotometry to evaluate their SPR absorption in wavelength range of 400–500 nm. The synthesis process was highly depend on the pH, reaction time, and mole ratios of the reactants. The synthesis only occur in pH 11 and at reaction time 30 min, the particle size of the formed AgNPs was 12 ± 7 nm. Longer reaction time increased the reducing performance of p-aminobenzoic acid in AgNPs synthesis but decreased its stabilizing performance. The increase of silver nitrate amount relative to p-aminobenzoic acid in the synthesis increased the reducing and stabilizing performance of p-aminobenzoic acid and the optimum mole ratio between AgNO3 and p-aminobenzoic acid was 5:100 (AgNO3 to p-aminobenzoic acid).

Pretreated Lignocellulosic Waste Mediated Biosynthesis of Silver Nanoparticles Under Room Temperature

2016 ◽  
Vol 15 (05n06) ◽  
pp. 1660001 ◽  
Author(s):  
V. P. Manjamadha ◽  
Karuppan Muthukumar
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nitrate ◽  
Room Temperature ◽  
Nitrate Solution ◽  
Silver Ions ◽  
Silver Nitrate Solution ◽  
Morphological Characterization ◽  
Alternative Source ◽  
X Ray ◽  
Antibacterial Performance

The current work elucidates the utilization of biowaste as a valuable reducing agent for the synthesis of silver nanoparticles. In this study, the wastewater generated during the alkaline pretreatment of lignocellulosic wastes (APLW) was used as a bioreductant to reduce silver nitrate under room temperature. Synthesis of stable silver nanoparticles (AgNPs) was achieved rapidly on addition of APLW into the silver nitrate solution (1[Formula: see text]mM). The morphological characterization of AgNPs was performed using field emission scanning electron microscopy (FESEM). The micrograph clearly depicted the presence of spherical AgNPs. The presence of elemental silver along with biomoilties was determined using energy dispersive X-ray spectroscopy (EDAX) analysis. The X-ray diffraction (XRD) study proved the crystalline form of stable AgNPs. The AgNPs exhibited excellent antibacterial performance against Gram negative organism. The immediate bioreduction of silver ions using APLW was well illustrated in the present study. Thus, APLW serve as an alternative source for reducing agents instead of utilizing valuable medicinal plants for nanoparticles synthesis.

Synthesis and Characterization of Silver Nanoparticles from Couroupita guianensis leaf extract–A Simple Green Route

2021 ◽  
pp. 2796-2800
Author(s):  
Inbathamizh L ◽  
Kalpana V ◽  
Revathi Yadav K
Keyword(s):  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Nitrate Solution ◽  
Ultra Violet ◽  
Silver Nitrate Solution ◽  
Green Route ◽  
Couroupita Guianensis ◽  
Potential Applications ◽  
Aqueous Leaf Extract

With the increase in the potential applications of nanoparticles in pharma and various fields, nanoparticle research is attracting more attention. Though several chemical and physical methods are being used for the synthesis of metal nanoparticles, they are associated with several disadvantages. Couroupita guianensis is a traditional plant with medicinal values. The focus of the study was to follow a green chemistry route to synthesize silver nanoparticles (AgNPs) using the leaf extract of Couroupita guianensis as a reductant and stabilizing agent. The boiled aqueous leaf extract with silver nitrate solution on exposure to sunlight showed the maximum absorbance at 430nm indicating the synthesis of AgNPs. Ultra Violet (UV)-Visible spectroscopy, Scanning Electron Microscopy (SEM), and Fourier Transform Infrared spectroscopy (FTIR) techniques were used for the characterization of AgNPs. The synthesized AgNPs were found to be spherical and 4.44 – 40.20nm in size. They also seemed to be capped with the significant functional groups present in the leaf extract. Thus, the study suggested Couroupita guianensis mediated green synthesis of AgNPs as an efficient and eco-friendly approach with substantial advantages over the conventional methods. The process could be further scaled-up for mass production and wider applications of AgNPs.

scholarly journals Silver Nanoparticles: Biosynthesis Using an ATCC Reference Strain ofPseudomonas aeruginosaand Activity as Broad Spectrum Clinical Antibacterial Agents

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Melisa A. Quinteros ◽  
Ivana M. Aiassa Martínez ◽  
Pablo R. Dalmasso ◽  
Paulina L. Páez
Keyword(s):  
Silver Nanoparticles ◽  
Broad Spectrum ◽  
Nitrate Solution ◽  
Human Neutrophils ◽  
Resistant Bacteria ◽  
Klebsiella Pneumonia ◽  
Bacterial Strains ◽  
Ag Nps ◽  
Tem Analysis ◽  
Vis Spectroscopy

Currently, the biosynthesis of silver-based nanomaterials attracts enormous attention owing to the documented antimicrobial properties of these ones. This study reports the extracellular biosynthesis of silver nanoparticles (Ag-NPs) using aPseudomonas aeruginosastrain from a reference culture collection. A greenish culture supernatant ofP. aeruginosaincubated at 37°C with a silver nitrate solution for 24 h changed to a yellowish brown color, indicating the formation of Ag-NPs, which was confirmed by UV-vis spectroscopy, transmission electron microscopy, and X-ray diffraction. TEM analysis showed spherical and pseudospherical nanoparticles with a distributed size mainly between 25 and 45 nm, and the XRD pattern revealed the crystalline nature of Ag-NPs. Also it provides an evaluation of the antimicrobial activity of the biosynthesized Ag-NPs against human pathogenic and opportunistic microorganisms, namely,Staphylococcus aureus,Staphylococcus epidermidis,Enterococcus faecalis,Proteus mirabilis,Acinetobacter baumannii,Escherichia coli,P. aeruginosa, andKlebsiella pneumonia. Ag-NPs were found to be bioactive at picomolar concentration levels showing bactericidal effects against both Gram-positive and Gram-negative bacterial strains. This work demonstrates the first helpful use of biosynthesized Ag-NPs as broad spectrum bactericidal agents for clinical strains of pathogenic multidrug-resistant bacteria such as methicillin-resistantS. aureus,A. baumannii, andE. coli. In addition, these Ag-NPs showed negligible cytotoxic effect in human neutrophils suggesting low toxicity to the host.

scholarly journals Green Silver Nanoparticles Embedded in Cellulosic Network for Fresh Food Packaging

2021 ◽  
Author(s):  
S. Chaitanya Kumari ◽  
P. Naga Padma ◽  
K. Anuradha
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Silver Nitrate ◽  
Shelf Life ◽  
Food Packaging ◽  
Nitrate Solution ◽  
Packaging Material ◽  
Packaging Materials ◽  
Coated Paper ◽  
Fresh Food

The demand for increasing the shelf life of fresh food as well as the need for protecting the food against foodborne infections warrant the demand for increasing the shelf life of fresh food. The incorporation of nanoparticles into the packaging material can enhance the preservation of perishable foods. Silver nanoparticles (AgNPs), in particular, have antibacterial, anti-mold, anti-yeast, and anti-viral activities can be embedded into the biodegradable packaging materials for this purpose. This study focuses on antimicrobial packaging materials for food by mixing the extracts of different plants with silver nitrate and depositing this mixture as a layer on the blotting papers, which are thick sheets of paper made of cellulose. Because the blotting papers are highly absorbent and porous, silver nitrate solution along with the plant extracts can be easily applied and allowed for in situ synthesis of AgNPs. Subsequently, these papers were analyzed and characterized using scanning electron microscopy, transmission electron microscopy, atomic absorption spectroscopy, and energy dispersive X-ray analysis. The coated paper exhibited good antibacterial activity against Escherichia coli and Staphylococcus aureus. Furthermore, the coated paper when used as a packaging material for tomatoes and coriander leaf, the shelf life was extended to about 30 days and 15 days respectively. The prepared cost-effective silver packing material can be used in food packaging for various perishable foods.

scholarly journals Subinhibitory concentrations of silver nanoparticles and silver nitrate on the adaptative and cross-resistance to antibiotics on bovine mastitis pathogens

2021 ◽  
Vol 51 (12) ◽  
Author(s):  
Patrícia Érica Fernandes ◽  
Roberta Barbosa Teodoro Alves ◽  
Natan de Jesus Pimentel-Filho ◽  
João Paulo Natalino de Sá ◽  
Hilário Cuquetto Mantovani ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nitrate ◽  
Chemical Reduction ◽  
Bovine Mastitis ◽  
Cross Resistance ◽  
Ag Nps ◽  
Adaptive Resistance ◽  
Subinhibitory Concentrations ◽  
Mastitis Pathogens ◽  
Sensitivity Profile

ABSTRACT: Biocides and/or antibiotics used in subinhibitory concentrations can promote the development of adaptive resistance or even cross-resistance in microorganisms. However, studies on these responses following silver treatments are scarce in the literature. Silver-based compounds, including silver nanoparticles (Ag-NPs), can be an alternative in the prevention and treatment of bovine mastitis. Thus, this research evaluated the effect of subinhibitory dosages of Ag-NPs and Ag+ ions from silver nitrate (AgNO3) on Staphylococcus aureus and Escherichia coli isolated from milk of cows with mastitis. Ag-NPs were synthesized by chemical reduction using AgNO3 and sodium citrate and the minimum inhibitory concentration (MIC) of Ag-NPs and Ag+ ions on the mastitis pathogens were determined. Isolates were exposed to subinhibitory concentrations of Ag-NPs or AgNO3 for 10 consecutive days to verify the development of adaptive resistance evaluated by changes in the MIC values. The development of cross-resistance with antibiotics was also studied, being verified by comparing the sensitivity profile of treated cells with non-treated cells. AgNO3 was more effective against all isolates. There was no change in the MIC values or in the antibiotic sensitivity profile for both bacteria following consecutive exposure to subinhibitory dosages of Ag-NPs or AgNO3, indicating that silver was not able to select adaptive resistance or cross resistance to the tested antibiotics. The potential of silver presented by these results is favorable to the continuity of studies aiming to elaborate silver-based therapies for the treatment of bovine mastitis.

Fast colourimetric detection of H2O2 by biogenic silver nanoparticles synthesised using Benincasa hispida fruit extract

2016 ◽  
Vol 5 (2) ◽  
Author(s):  
Kaushik Roy ◽  
Chandan K. Sarkar ◽  
Chandan K. Ghosh
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nitrate ◽  
Nitrate Solution ◽  
Silver Nitrate Solution ◽  
Single Step ◽  
Fruit Extract ◽  
Biogenic Silver Nanoparticles ◽  
Benincasa Hispida

AbstractThis study reports a single-step, fast and eco-friendly procedure for preparing silver nanoparticles from silver nitrate solution using fruit extract of

Sign in / Sign up

Export Citation Format

Share Document