scholarly journals Elemental Silver Nanoparticles: Biosynthesis and Bio Applications

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3177 ◽  
Author(s):  
Mikhailov ◽  
Mikhailova
Keyword(s):  
Silver Nanoparticles ◽  
21St Century ◽  
Geometric Shapes ◽  
Elemental Silver ◽  
Biological Methods

The data on the specifics of synthesis of elemental silver nanoparticles (Ag-NP) having various geometric shapes (pseudo spherical, prismatic, cubic, trigonal-pyramidal, etc.), obtained by using various biological methods, and their use in biology and medicine have been systematized and generalized. The review covers mainly publications published in the current 21st century. Bibliography: 262 references.

Progress in the synthesis of Ag nanoparticles having manifold geometric forms

2018 ◽  
Vol 38 (1) ◽  
pp. 21-42 ◽  
Author(s):  
Oleg V. Mikhailov
Keyword(s):  
Silver Nanoparticles ◽  
21St Century ◽  
Ag Nanoparticles ◽  
Elemental Silver ◽  
Biological Methods ◽  
Specific Synthesis

AbstractThe data on the specific synthesis of elemental silver nanoparticles having the forms of various geometric bodies (pseudo spherical, prismatic, cubic, trigonal-pyramidal, etc.), obtained by various chemical, physicochemical, and biological methods, have been systematized and generalized. This review covers mainly publications published in the current 21st century.

Achievements in the Synthesis of Elemental Silver Nanoparticles with Various Geometric Forms

2018 ◽  
Vol 15 (2) ◽  
pp. 112-128
Author(s):  
Oleg V. Mikhailov
Keyword(s):  
Silver Nanoparticles ◽  
Reducing Agents ◽  
Molar Ratio ◽  
Capping Agent ◽  
Elemental Silver ◽  
Methods Of Synthesis ◽  
Physicochemical Methods ◽  
Biological Methods ◽  
Specific Synthesis

Background:The data on the specific synthesis of elemental silver nanoparticles (Ag-NP) having the forms of various geometric bodies (pseudo spherical, prismatic, cubic, trigonal-pyramidal, etc.), obtained by various methods, have been systematized and generalized.Objective:It is noted that the forms and sizes of Ag-NP are greatly dependant on the conditions in which they are formed.Method:Comparison of the data of the characteristics of silver nanoparticles obtained by chemical, physicochemical and biological methods has been made.Results:It has been shown that form and size of produced Ag-NP depend strongly on the such factors as temperature, the concentration of silver(I) containing precursor, pH of the solution, the molar ratio between capping agent and silver(I) containing precursor, reducing agents etc., and, also, on the method used for Ag-NP synthesis (chemical, physicochemical or biological).It has also been noted that biological methods of synthesis of Ag-NP are generally more preferable in comparison with the chemical and physicochemical methods. The review covers mainly publications published in the last 20 years.

scholarly journals Biosynthesis of Silver Nanoparticles Mediated by Entomopathogenic Fungi: Antimicrobial Resistance, Nanopesticides, and Toxicity

Antibiotics ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 852
Author(s):  
Tárcio S. Santos ◽  
Tarcisio M. Silva ◽  
Juliana C. Cardoso ◽  
Ricardo L. C. de Albuquerque-Júnior ◽  
Aleksandra Zielinska ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Filamentous Fungi ◽  
Entomopathogenic Fungi ◽  
Antimicrobial Agents ◽  
Insect Pests ◽  
Insect Control ◽  
Biological Synthesis ◽  
Biological Methods ◽  
Potential Use

Silver nanoparticles are widely used in the biomedical and agri-food fields due to their versatility. The use of biological methods for the synthesis of silver nanoparticles has increased considerably due to their feasibility and high biocompatibility. In general, microorganisms have been widely explored for the production of silver nanoparticles for several applications. The objective of this work was to evaluate the use of entomopathogenic fungi for the biological synthesis of silver nanoparticles, in comparison to the use of other filamentous fungi, and the possibility of using these nanoparticles as antimicrobial agents and for the control of insect pests. In addition, the in vitro methods commonly used to assess the toxicity of these materials are discussed. Several species of filamentous fungi are known to have the ability to form silver nanoparticles, but few studies have been conducted on the potential of entomopathogenic fungi to produce these materials. The investigation of the toxicity of silver nanoparticles is usually carried out in vitro through cytotoxicity/genotoxicity analyses, using well-established methodologies, such as MTT and comet assays, respectively. The use of silver nanoparticles obtained through entomopathogenic fungi against insects is mainly focused on mosquitoes that transmit diseases to humans, with satisfactory results regarding mortality estimates. Entomopathogenic fungi can be employed in the synthesis of silver nanoparticles for potential use in insect control, but there is a need to expand studies on toxicity so to enable their use also in insect control in agriculture.

Synthesis and Characterization of Silver Nanoparticles from Psidium Guajava Leaf Extract

2021 ◽  
Vol 14 (5) ◽  
pp. 5634-5638
Author(s):  
Sruthi Radhakrishnan
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Leaf Extract ◽  
Nanoparticle Synthesis ◽  
Ethanolic Extract ◽  
Psidium Guajava ◽  
Sem Analysis ◽  
Synthesis Of Nanoparticles ◽  
Elemental Silver ◽  
Ft Ir

Green route for the synthesis of nanoparticles has become more acceptable than the other chemical as well as biological route. In the present study, silver nanoparticle is synthesized using ethanolic extract of Psidium guajava leaves. Further the synthesized silver nanoparticles were characterized by UV-Visible Spec, FT-IR, X-Ray Diffraction FESEM and E-DAX. The results of FT-IR provided evidence of the involvement of phytochemicals present in the leaf extract in the reduction of silver nitrate to silver nanoparticles. XRD confirmed the crystalline structure as well as shape of the synthesized nanoparticle as face-centred cubic. E-DAX profiling helped in determining the presence of elemental silver. The size of the nanoparticle procured by SEM analysis was found to be approximately 30-50 nm in size. Thus, the findings of this study showed that the plant assisted method for silver nanoparticle synthesis is more effective and further application level studies can shed lights on their use in healing of various human ailments.   

scholarly journals Synthesis of Silver Nanoparticles from Anagalis arvensis and Their Biomedical Applications

2018 ◽  
Author(s):  
Mohib Shah ◽  
Natasha Anwar ◽  
Samreen Saleem ◽  
Iqbal Munir ◽  
Niaz Ali Shah ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Reducing Power ◽  
Spherical Shape ◽  
Artemia Salina ◽  
Maximum Activity ◽  
Tem Analysis ◽  
Synthesis Of Nanoparticles ◽  
The Stability ◽  
Average Size ◽  
Biological Methods

Background. Nanotechnology is promising field for generating new applications. A green synthesis of nanoparticles through biological methods using plant extract have a reliable and ecofriendly approach to improve our global environment. Methods. Silver nanoparticles (AgNPs) were synthesized using aqueous extract of Anagalis arvensis L and silver nitrate and were physicochemically characterized. Results. The stability of AgNPs toward acidity, alkalinity, salinity and temperature showed that they remained stable at room temperature for more than two months. The SEM and TEM analysis of the AgNPs showed that they have a uniform spherical shape with an average size in the range of 40–78 nm. Further 1-Dibhenyl-2-Picrylhydrazl radical in Anagalis arvensis L.mediated AgNPs showed a maximum activity of 98% at concentration of 200μg/mL. Hydrogen peroxide scavenging assay in Anagalis arvensis L. mediated AgNPs showed a maximum activity of 85% at concentration of 200μg/mL. Reducing power of Anagalis arvensis L.Ag NPs exhibited a higher activity of 330 μg/mL at concentration of 200 μg/mL. These NPs have cytotoxic effects against brine shrimp (Artemia salina) nauplii with a value of 53% LD 178.04μg/mL. Conclusion. The AgNPs synthesized using Anagalis arvensis L. extract demonstrate a broad range of applications.

scholarly journals Synthesis of Silver Nanoparticles of Corn Silk Agrowaste and Their Bioactivities

2020 ◽  
Vol 32 (6) ◽  
pp. 1497-1504
Author(s):  
S. Fuloria ◽  
O.J. Hong ◽  
C.B. Kim ◽  
B.Y.S. Ting ◽  
S. Karupiah ◽  
...  
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Size Range ◽  
Silver Content ◽  
Stability Study ◽  
Particle Size Range ◽  
Corn Silk ◽  
Light Yellow ◽  
Optimization Study ◽  
Elemental Silver

Present study was intended to synthesize silver nanoparticles (AgNPs) using corn silk aqueous extract (CSAE) and evaluate for antimicrobial and antiurolithiatic potential. The aqueous decoction of corn silk offered light yellow CSAE. Treatment of AgNO3 with CSAE offered AgNPs with absorbance 430 nm. Optimization study established 5 mM silver nitrate, 2.5:7.5 extract to AgNO3 ratio, pH 8, and 24 h time as parametric requirement for synthesis of AgNPs using CSAE. Stability study supported the AgNPs stability based on retention of SPR signal between 428 to 450 nm. The synthesis of AgNPs was confirmed on broad and shifted FTIR bands; XRD signals at 2θ values of 32.27º, 40.72º, 46.20º, 65.69º, 69.31º and 76.49º indexed to 111, 200, 220 and 311 planes, respectively; particle size range from 22.05-36.69 nm in FESEM; and elemental silver content of 62.17% as per EDX spectrum. The synthesized AgNPs exhibited high antibacterial and antiurolithiatic potential. Present study recommends that synthesis of AgNPs using CSAE is a facile and eco-friendly method

scholarly journals Preparation of Silver Nanoparticles Suitable for Textile Finishing Processes to Produce Textiles with Strong Antibacterial Properties against Different Bacteria Types

2011 ◽  
Vol 66 (9) ◽  
pp. 905-916 ◽  
Author(s):  
Boris Mahltig ◽  
Marianne Reibold ◽  
Emanuel Gutmann ◽  
Torsten Textor ◽  
Jochen Gutmann ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Antibacterial Properties ◽  
Preparation Technique ◽  
Silver Particles ◽  
High Antimicrobial Activity ◽  
Elemental Silver ◽  
Vis Spectroscopy ◽  
Potential Applications ◽  
Coating Agents

This study describes the development of a preparation technique for silver nanoparticles useable as antimicrobial material which is especially useful for textile treatment to realize antimicrobial fabrics. The silver particles need to be prepared by reduction of AgNO3 under moderate conditions and with a moderate and non-toxic reductive agent. Comparative investigations were carried out with silver particles prepared by a solvothermal process or with NaBH4 as reductive agent. Particularly, suitable silver solutions are obtained by stabilizing the silver particles with polyvinylpyrollidone PVP of high molecular weight (Mw ~ 360000 gmol−1) and the use of the non-toxic reductive agents ascorbic acid and fructose. Under these conditions the diameters of the silver particles are in the range of 10 to 30 nm as determined by HR-TEM. The formation of elemental silver has been verified by transmission electron microscopy (TEM), X-ray diffraction (XRD) and optical spectroscopy. The properties of silver particle-containing liquids were investigated by using UV/Vis spectroscopy and dynamic light scattering. Further information on particle size and size distribution was gained through SEM investigations. The prepared solutions of silver nanoparticles can be applied easily onto textiles as liquid coating agents. All prepared textile samples exhibited a high antimicrobial activity against Escherichia coli. However, only few solutions containing silver particles of smaller size exhibit high antimicrobial activity also against other types of bacteria such as Staphylococcus aureus and Streptococcus pneumoniae. Because of this high antimicrobial potential gained with silver solutions prepared in a simple process without usage of toxic components, the developed materials offer a broad range of potential applications.

scholarly journals Synthesis, Characterization and In Vitro Antibacterial Evaluation of Pyrenacantha grandiflora Conjugated Silver Nanoparticles

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1568
Author(s):  
Arinao Murei ◽  
Karen Pillay ◽  
Patrick Govender ◽  
Ntevheleni Thovhogi ◽  
Wilson M. Gitari ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antimicrobial Agents ◽  
Antibacterial Activities ◽  
Antimicrobial Activities ◽  
Biological Synthesis ◽  
Klebsiella Pneumonia ◽  
Drug Resistant ◽  
Biological Methods ◽  
Mic Value

In the present study, silver nanoparticles (AgNPs) were synthesized using both the chemical and biological methods and conjugated with Pyrenacantha grandiflora extracts. These were then characterized and evaluated for antimicrobial activities against multi-drug resistant pathogens, such as methicillin-resistant Staphylococcus aureus (MRSA), Klebsiella pneumonia, and Escherichia coli. Nanoparticles were analyzed with UV-visible spectrophotometer, transmission electron microscopy (TEM), and energy dispersive X-ray analysis (EDX). Silver nanoparticles, P. grandiflora extracts, and the conjugates were also analyzed with Fourier transform infrared spectroscopy (FTIR). As a result, quasi-sphere-shaped AgNPs with sizes ranging from 5 to 33 nm and spherically shaped AgNPs with sizes ranging from 3 to 25 nm were formed from chemical and biological synthesis, respectively. A well diffusion assay showed that the activity of silver nanoparticles was most improved with acetone extract against all tested bacteria with diameters in the range of 19–24 mm. The lowest MIC value of 0.0063 mg/mL against MRSA was observed when biologically synthesized AgNPs were conjugated with acetone and water extracts. Chemically synthesized silver nanoparticles showed the lowest MIC value of 0.0063 mg/mL against E. coli when conjugated with acetone and methanol extracts. This study indicates that silver nanoparticles conjugated with P. gandiflora tubers extracts exhibit strong antibacterial activities against multi-drug resistant bacterial pathogens. Therefore, biosynthesized conjugates could be utilized as antimicrobial agents for effective disease management due to the synergistic antibacterial activity that was observed.

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