scholarly journals Synthesis of Silver Nanoparticles from Malva parviflora Extract and Effect on Ecto-5'- Nucleotidase(5'-NT), ADA and AMPDA Enzymes in Sera of Patients with Arthrosclerosis

2017 ◽  
Vol 14 (4) ◽  
pp. 742-750 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Silver Ions ◽  
Reducing Agent ◽  
Rapid Reduction ◽  
Agno3 Solution ◽  
Malva Parviflora

The present research included synthesis of silver nanoparticle from(1*10-3,1*10-4 and1*10-5) M aqueous AgNO3 solution through the extract of M.parviflora reducing agent. In the process of synthesizing silver nanoparticles we detected a rapid reduction of silver ions leading to the formation of stable crystalline silver nanoparticles in the solution.

scholarly journals Single Pot Synthesis of Gellan Gum Coated Silver Nanoparticles and its Antimicrobial Activity

2021 ◽  
Vol 33 (9) ◽  
pp. 2049-2052
Author(s):  
D. Muralidharan ◽  
A. Jaculin Raiza ◽  
K. Pandian
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Silver Ions ◽  
Reducing Agent ◽  
Gellan Gum ◽  
Pathogenic Microorganisms ◽  
Complete Reduction ◽  
Excellent Activity ◽  
Analytical Tools

A single pot synthesis of gellan gum coated silver nanoparticles using aniline as a reducing agent has been investigated in present study. The reaction was facile at 80 ºC under reflux condition and the complete reduction of silver ions was noted within 2 h. The resulting gellan gum protected silver nanoparticle was isolated and analyzed with various analytical tools. The antimicrobial activity of the prepared nanocomposite had shown an excellent activity against some selected pathogenic microorganisms.

scholarly journals Eco-Friendly Approach to Control Mosquitos (A. stephensi, C. quinquefasciatus, and A. aegypti) Using Silver Nanoparticle

2020 ◽  
Vol 9 (1) ◽  
pp. 203-210
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Ag Nanoparticles ◽  
Leaf Extract ◽  
Anopheles Stephensi ◽  
Methanol Extract ◽  
Silver Ions ◽  
Mosquito Vectors ◽  
Chemical Insecticide ◽  
Ft Ir

The available controlling agents for mosquito vectors are chemical insecticides and the frequent usage of these insecticides creating resistance among mosquito vectors and environmental pollutions. Thus, the study was designed to synthesize and characterize the Ag nanoparticles (AgNPs) through a methanol leaf extract of Ocimum canum and find the larvicidal prospective of the AgNPs on the 4th instar larvae of Anopheles stephensi, Culex quinquefasciatus, and Aedes aegypti. The obtained outcomes show that the methanol leaf extract of O. canum was effectively reduced the silver ions and produce constant silver nanoparticles. It was characterized and confirmed by various scientific techniques such as UV-vis spectrum, XRD, SEM, FT-IR and EDaX. Various concentrations (10, 50, 150, 200, and 250 ppm) of characterized nanoparticles were tested for larvicidal activity. The premier larval death was observed at 24 h of treatment on A. aegypti with LC50= 17.03 ppm, followed by C. quinquefasciatus with LC50= 14.89 ppm of methanol extract of O. canum and no death was noticed on A. stephensi. The LD90 value for A. aegypti and C. quinquefasciatus were 24.18 & 20.65 ppm respectively. Hence, the Ag nanoparticles produced from methanol leaf extract of O. canum retains efficiency to control A. aegypti and C. quinquefasciatus. Thus, it might support partially to replace the chemical insecticide which used against these vectors and might contribute to reduce environmental pollution.

scholarly journals Silver nanoparticles – wolves in sheep's clothing?

2015 ◽  
Vol 4 (3) ◽  
pp. 563-575 ◽  
Author(s):  
Rasmus Foldbjerg ◽  
Xiumei Jiang ◽  
Teodora Miclăuş ◽  
Chunying Chen ◽  
Herman Autrup ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Molecular Mechanisms ◽  
Silver Ions ◽  
Nanoparticle Toxicity ◽  
Intracellular Fate

We review the cellular and molecular mechanisms behind silver nanoparticle toxicity and their intracellular fate. In addition, the role of silver ions in the toxicity of silver nanoparticles is discussed.

scholarly journals Antimicrobial Effect of Electrospun Nanofibers Loaded with Silver Nanoparticles: Influence of Ag Incorporation Method

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Luis Jesús Villarreal-Gómez ◽  
Graciela Lizeth Pérez-González ◽  
Nina Bogdanchikova ◽  
Alexey Pestryakov ◽  
Vadim Nimaev ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Electrospun Nanofibers ◽  
Silver Ions ◽  
Antimicrobial Effect ◽  
The Other ◽  
High Antimicrobial Activity ◽  
Biomedical Industry ◽  
Incorporation Method

The antimicrobial bioactivity of silver nanoparticles is well known, and they can be used widely in many applications, becoming especially important in the biomedical industry. On the other hand, the electrospun nanofibers possess properties that can enhance silver nanoparticle applicability. However, silver nanoparticle bioactivity differs depending on the loading of silver ions into electrospun nanofibers. This review is aimed at comparing different silver incorporation methods into electrospun nanofibers and their antimicrobial activity, discussing each procedure’s limitations, and presenting the most promising one. This review showed that the preferred techniques for incorporating silver nanoparticles were direct blending and ultraviolet irradiation methods due to their simplicity and efficient results. Besides, polyacrylonitrile nanofibers (PAN) have been the most reported system loaded with silver nanoparticles. Finally, independently of the technique used, silver nanoparticle-loaded nanofibers show high antimicrobial activity in all cases.

Synthesis of Silver Nanoparticles at the Liquid–Liquid Using Ultrasonic Wave

2013 ◽  
Vol 135 (1) ◽  
Author(s):  
Seong-Ik Hong ◽  
Alma Duarte ◽  
Gabriel A. Gonzalez ◽  
Nam-Soo Kim
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
New Technologies ◽  
Ultrasonic Waves ◽  
Reducing Agent ◽  
Liquid Interface ◽  
Silver Ion ◽  
Nanoparticle Size ◽  
Ion Movement

The high demand of flexible electronics and the miniaturization of electronic components have been increasing very rapidly. Nanotechnology and in particular nanoparticles have become very important for the development of new technologies and applications which depend on the synthesis and characterization of nanoparticles with specific properties. Significant attention has been focused on the characteristics of the nanoparticles since their properties, particle size and shape are very different when compared to those of the bulk materials. In order to produce nanoparticles with more efficient structures and electronic properties for nano ink, it is necessary to control the particle size to avoid agglomeration. Currently, the nanoparticle size and its agglomeration is controlled by surfactants, but some studies have shown that adding surfactants have negative effects on the conductivity of the nanoparticles along with the high curing temperatures of nano-ink. In this study, silver nanoparticles were synthesized by adding methanol to water instead of surfactants in order to control the silver nanoparticle size. The water and methanol solution was prepared by using different ratios v/v of water/methanol obtaining a liquid–liquid interface and forming a molecular–molecular interface restricting the silver ion movement in the solution. In addition to the liquid–liquid interface, the ion concentration and movement were also restricted through a spraying mist by using ultrasonic waves. The silver ion and the reducing agent were found to have a difference in concentration by the spraying mist method. The movement of the silver ions and the reducing agents were controlled by the difference in concentration. It was observed that the control of the nanoparticles and ion movement was more efficient by spraying silver ion solution than using a reducing agent solution. We confirmed that by increasing the volumetric ratios of methanol the silver nanoparticle size also increased. The mist particle size and the concentration were also calculated at different volumetric ratios of methanol.

Application of Gradient and Confocal Raman Spectroscopy to Analyze Silver Nanoparticle Diffusion in Medieval Glasses

2009 ◽  
Vol 8 ◽  
pp. 89-97 ◽  
Author(s):  
F. Rubio ◽  
Sofia Pérez-Villar ◽  
Miguel Angel Garrido ◽  
Juan Rubio ◽  
J.L. Oteo
Keyword(s):  
Raman Spectroscopy ◽  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Glass Surface ◽  
Microprobe Analysis ◽  
Glass Structure ◽  
Silver Ions ◽  
Nanoparticle Concentration ◽  
Confocal Raman Spectroscopy ◽  
Nanoparticle Diffusion

In this work it has been carried out the diffusion of silver ions in medieval glasses by a heat treatment process. Silver ions are transformed into both silver nanoparticles and nanoclusters after redox reactions with reducing glass ions. Changes in glass colour due to the formation of these silver nanoparticles have been analysed by means of visible spectroscopy. At the same time, changes in glass structure have been analysed by means of Raman scattering. By using confocal Raman spectroscopy the in deep glass structural changes occurring after silver ion diffusion and silver nanoparticle formation have been studied. These changes have been corroborated by means of gradient Raman spectroscopy where the silver ion and silver nanoparticle diffusion have been analysed on a fractured glass surface. In all cases have been observed that silver nanoparticles produce a depolymerisation of the glass structure and that such depolymerisation increases with the amount of silver nanoparticles. By using Microprobe Analysis it has been found that the higher silver nanoparticle concentration is on the glass surface and it decreases with the distance to the surface according to a diffusion process. By using nanoindentation measurements on original and gradient glass surfaces it has been found an increase of the Young modulus from 60 to 85 GPa, being the first value that corresponding to the glass surface with high silver nanoparticle concentration, and the second one for the glass without silver. This result is in accordance with Raman and Microprobe analysis.

scholarly journals Green Synthesis of Ag Nanoparticles for Anti-Microbial Applications using Aloe Barbadensis Miller Extract

2021 ◽  
pp. 233-239
Author(s):  
Sankar S ◽  
Ganga Krishnan
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Ag Nanoparticles ◽  
Aloe Vera ◽  
Silver Ions ◽  
Xrd Analysis ◽  
Aloe Barbadensis ◽  
Agno3 Solution ◽  
Vis Spectroscopy ◽  
Ft Ir

The green synthesis of nanomaterials is becoming much popular as a result of worldwide problems associated with environmental concerns. In the present work, leaf extract of Barbadensis Miller, (commonly known as Aloe vera) was used for bio-reduction of silver ions to silver nanoparticles. Aloe vera extract and AgNO3 solution in different volumes were treated and it resulted in the reduction of Ag+ ions to Ag metal atoms, which further accumulated as Ag nanoparticles. The prepared nanoparticles were characterized by UV-vis spectroscopy, SEM, FT-IR spectroscopy and XRD analysis. The present study established that the shape and size of the silver nanoparticles can be effectively controlled and modulated using green synthesis technique. The scope of the prepared particles for anti-microbial applications were also investigated.

scholarly journals Synthesis and Characterization of Silver Nanoparticles Prepared with Carrasquilla Fruit Extract (Berberis hallii) and Evaluation of Its Photocatalytic Activity

Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1195
Author(s):  
Geovanna Arroyo ◽  
Yolanda Angulo ◽  
Alexis Debut ◽  
Luis Heriberto Cumbal
Keyword(s):  
Silver Nanoparticles ◽  
Photocatalytic Activity ◽  
Silver Ions ◽  
Industrial Processes ◽  
Metallic Elements ◽  
Fruit Extract ◽  
Agno3 Solution ◽  
Solar Light Irradiation ◽  
Thiazine Ring

In this study, silver nanoparticles (AgNPs) were obtained using a green-chemistry procedure. For this protocol, the Carrasquilla extract (CE) (Berberis hallii) and a AgNO3 solution were used as the reducing agent and the metal precursor, respectively. The as-prepared AgNPs after characterization were then used to evaluate the degradation of the methylene blue (MB), the safranin (SF), and the mixture of both dyes in the aqueous phase under solar light irradiation. The photocatalytic activity of AgNPs for the degradation of the MB (k = 0.0092 min−1) was higher than the SF (k = 0.00016 min−1) due to the susceptibility of the thiazine ring of the MB to photodegradation contrasted to the phenyl phenazine of the SF. However, SF was mostly removed by adsorption with a maximum uptake of 2907 mg/g. Overall, this eco-friendly and green conversion of silver ions to metallic elements avoids the use of toxic chemicals and could be applied for the degradation/adsorption of dyes used in several industrial processes.

Green synthesis of silver nanoparticles with enhanced antibacterial activity using holocellulose as a substrate and reducing agent

RSC Advances ◽  
2016 ◽  
Vol 6 (34) ◽  
pp. 28140-28148 ◽  
Author(s):  
Lian-Hua Fu ◽  
Fu Deng ◽  
Ming-Guo Ma ◽  
Jun Yang
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Green Synthesis ◽  
Hydrothermal Method ◽  
Silver Ions ◽  
Reducing Agent ◽  
Uniform Size

The silver nanoparticles with uniform size and well-defined structure have been synthesized by using a hydrothermal method with holocellulose as substrate and reducing agent for silver ions, which exhibited good cytocompatibility and highly toxic.

scholarly journals Research of the regularities of obtaining silver nanoparticles with applying of polyvinylpyrolidone and their effect on composite’s fungibactericidal properties

2021 ◽  
Vol 4 (1) ◽  
pp. 237-242
Author(s):  
Н. D. Dudok ◽  
◽  
N. B. Semenyuk ◽  
T. V. Skorokhoda ◽  
Yu. Ya. Melnyk ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antimicrobial Properties ◽  
Silver Ions ◽  
Reduction Reaction ◽  
Reducing Agent ◽  
Practical Application ◽  
Technological Factors ◽  
Porous Blocks ◽  
The Impact ◽  
Kinetics Of

The influence of technological factors on the regularities of obtaining silver nanoparticles using polyvinylpyrrolidone as reducing agent has been researched and its influence in compositions content on antimicrobial properties of last ones have been defined. The impact of temperature and polyvinylpyrrolidone content as well as Ag+ concentration on the kinetics of the reduction reaction of silver ions was determined. Silver-containing composites in the form of porous blocks and films were synthesized and their bactericidal and fungicidal properties were studied. The possibility of practical application of composites in biomedical area in the processes of osteogenesis has been confirmed.

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