scholarly journals An Organic–Inorganic Hybrid Nanocomposite as a Potential New Biological Agent

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2551
Author(s):  
Mateusz Dulski ◽  
Katarzyna Malarz ◽  
Michał Kuczak ◽  
Karolina Dudek ◽  
Krzysztof Matus ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antimicrobial Effect ◽  
Metallic Silver ◽  
Silica Network ◽  
E Coli ◽  
Silica Nanocomposites ◽  
Independent Mechanism ◽  
Silver Oxide Nanoparticles ◽  
Genetic And Environmental Factors ◽  
Average Size

To solve the problem of human diseases caused by a combination of genetic and environmental factors or by microorganisms, intense research to find completely new materials is required. One of the promising systems in this area is the silver-silica nanocomposites and their derivatives. Hence, silver and silver oxide nanoparticles that were homogeneously distributed within a silica carrier were fabricated. Their average size was d = (7.8 ± 0.3) nm. The organic polymers (carboxymethylcellulose (CMC) and sodium alginate (AS)) were added to improve the biological features of the nanocomposite. The first system was prepared as a silver chlorine salt combination that was immersed on a silica carrier with coagulated particles whose size was d = (44.1 ± 2.3) nm, which coexisted with metallic silver. The second system obtained was synergistically interacted metallic and oxidized silver nanoparticles that were distributed on a structurally defective silica network. Their average size was d = (6.6 ± 0.7) nm. Physicochemical and biological experiments showed that the tiny silver nanoparticles in Ag/SiO2 and Ag/SiO2@AS inhibited E. coli, P. aeruginosa, S. aureus, and L. plantarum’s cell growth as well as caused a high anticancer effect. On the other hand, the massive silver nanoparticles of Ag/SiO2@CMC had a weaker antimicrobial effect, although they highly interacted against PANC-1. They also generated reactive oxygen species (ROS) as well as the induction of apoptosis via the p53-independent mechanism.

scholarly journals Green Synthesized Silver Nanoparticles Immobilized on Activated Carbon Nanoparticles: Antibacterial Activity Enhancement Study and Its Application on Textiles Fabrics

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3790
Author(s):  
Pratama Jujur Wibawa ◽  
Muhammad Nur ◽  
Mukhammad Asy’ari ◽  
Wijanarka Wijanarka ◽  
Heru Susanto ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Activated Carbon ◽  
Aloe Vera ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
E Coli ◽  
Transmission Electron ◽  
Average Size ◽  
Green Synthesized Silver Nanoparticles

This research aimed to enhance the antibacterial activity of silver nanoparticles (AgNPs) synthesized from silver nitrate (AgNO3) using aloe vera extract. It was performed by means of incorporating AgNPs on an activated carbon nanoparticle (ACNPs) under ultrasonic agitation (40 kHz, 2 × 50 watt) for 30 min in an aqueous colloidal medium. The successful AgNPs synthesis was clarified with both Ultraviolet-Visible (UV-Vis) and Fourier Transform Infrared (FTIR) spectrophotometers. The successful AgNPs–ACNPs incorporation and its particle size analysis was performed using Transmission Electron Microscope (TEM). The brown color suspension generation and UV-Vis’s spectra maximum wavelength at around 480 nm confirmed the existence of AgNPs. The particle sizes of the produced AgNPs were about 5 to 10 nm in the majority number, which collectively surrounded the aloe vera extract secondary metabolites formed core-shell like nanostructure of 8.20 ± 2.05 nm in average size, while ACNPs themselves were about 20.10 ± 1.52 nm in average size formed particles cluster, and 48.00 ± 8.37 nm in average size as stacking of other particles. The antibacterial activity of the synthesized AgNPs and AgNPs-immobilized ACNPs was 57.58% and 63.64%, respectively (for E. coli); 61.25%, and 93.49%, respectively (for S. aureus). In addition, when the AgNPs-immobilized ACNPs material was coated on the cotton and polyester fabrics, the antibacterial activity of the materials changed, becoming 19.23% (cotton; E. coli), 31.73% (polyester; E. coli), 13.36% (cotton; S. aureus), 21.15% (polyester; S. aureus).

scholarly journals Effect of Dispersion Solvent on the Deposition of PVP-Silver Nanoparticles onto DBD Plasma-Treated Polyamide 6,6 Fabric and Its Antimicrobial Efficiency

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 607
Author(s):  
Ana I. Ribeiro ◽  
Martina Modic ◽  
Uros Cvelbar ◽  
Gheorghe Dinescu ◽  
Bogdana Mitu ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Antimicrobial Effect ◽  
Dbd Plasma ◽  
Surface Distribution ◽  
E Coli ◽  
Log Reduction ◽  
Spray Method ◽  
Exhaustion Method

Polyvinylpyrrolidone-coated silver nanoparticles (PVP-AgNPs) dispersed in ethanol, water and water/alginate were used to functionalize untreated and dielectric barrier discharge (DBD) plasma-treated polyamide 6,6 fabric (PA66). The PVP-AgNPs dispersions were deposited onto PA66 by spray and exhaustion methods. The exhaustion method showed a higher amount of deposited AgNPs. Water and water-alginate dispersions presented similar results. Ethanol amphiphilic character showed more affinity to AgNPs and PA66 fabric, allowing better uniform surface distribution of nanoparticles. Antimicrobial effect in E. coli showed good results in all the samples obtained by exhaustion method but using spray method only the DBD plasma treated samples displayed antimicrobial activity (log reduction of 5). Despite the better distribution achieved using ethanol as a solvent, water dispersion samples with DBD plasma treatment displayed better antimicrobial activity against S. aureus bacteria in both exhaustion (log reduction of 1.9) and spray (methods log reduction of 1.6) due to the different oxidation states of PA66 surface interacting with PVP-AgNPs, as demonstrated by X-ray Photoelectron Spectroscopy (XPS) analysis. Spray method using the water-suspended PVP-AgNPs onto DBD plasma-treated samples is much faster, less agglomerating and uses 10 times less PVP-AgNPs dispersion than the exhaustion method to obtain an antimicrobial effect in both S. aureus and E. coli.

scholarly journals Synergistic Antifungal Activity of Green Synthesized Silver Nanoparticles and Epoxiconazole against Setosphaeria turcica

2020 ◽  
Vol 2020 ◽  
pp. 1-7 ◽  
Author(s):  
Weidong Huang ◽  
Minhui Yan ◽  
Haiming Duan ◽  
Yaling Bi ◽  
Xinxin Cheng ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antimicrobial Agents ◽  
Integrated Control ◽  
Antimicrobial Effect ◽  
Colony Growth ◽  
Setosphaeria Turcica ◽  
Ligustrum Lucidum ◽  
In Vitro Inoculation ◽  
Average Size

It is urgent to develop highly efficient and eco-friendly antimicrobial agents for integrated control of phytopathogens. Silver nanoparticles (AgNPs) were synthesized by Ligustrum lucidum leaf extract. UV-vis spectrum showed that there was a strong absorbance at 438 nm. Transmission electron microscopy (TEM) images displayed that synthesized nanoparticles were near spherical with an average size of 13 nm. The antimicrobial effect of AgNPs was evaluated through methods of paper disk diffusion, colony growth, conidia germination, and in vitro inoculation. The 50% inhibition concentration (IC50) of AgNPs against Setosphaeria turcica was 170.20 μg/mL calculated by SPSS 13.0. In addition, it displayed a significant synergistic antifungal effect when AgNPs were combined with epoxiconazole at the ratios of 8 : 2 and 9 : 1. The results of this study provide a novel fungistat not only for comprehensive control of plant fungi but also for reducing chemical pesticides use and avoiding drug-resistant phytopathogen generation.

Trillium govanianum Wall. Ex. Royle rhizomes extract-medicated silver nanoparticles and their antimicrobial activity

2020 ◽  
Vol 9 (1) ◽  
pp. 503-514 ◽  
Author(s):  
Khaleeq Uz-Zaman ◽  
Jehan Bakht ◽  
Bates Kudaibergenova Malikovna ◽  
Eman R. Elsharkawy ◽  
Anees Ahmed Khalil ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Cost Effective ◽  
Face Centered Cubic ◽  
Synthesis Of Nanoparticles ◽  
E Coli ◽  
Area Of Interest ◽  
Cost Effective Technique ◽  
Face Centered ◽  
Trillium Govanianum ◽  
Average Size

AbstractSynthesis of nanoparticles is a fast-growing area of interest in the current development in science and technology. Nanoparticles are also used in biomedical applications. Green synthesis of nanoparticles is an environmental friendly and cost-effective technique. Trillium govanianum Wall. Ex. Royle crude extract was used for the eco-friendly genesis of silver nanoparticles (AgNPs). Aromatic amines were the functional groups involved in the bio-fabrication and synthesis of the AgNPs. The production of AgNPs was established by the appearance of brown color. The manufactured AgNPs were characterized by UV-Vis spectrophotometer, X-ray diffractometer, and FTIR spectrophotometer. AgNPs were face-centered cubic in nature with an average size of 9.99 nm. The produced AgNPs (18 µL disc−1) showed substantial antibacterial (53.74, 52.75, 51.61, 43.00, 36.84, and 36.84%) and antifungal (54.05, 42.11, 41.10, 40.85, 30.55, and 29.73%) potential against the tested bacterial (X. campestris, P. aeruginosa, S. aureus, E. coli, B. subtilis, and K. pneumoniae) and fungal (A. alternaria, Paecilomyces, C. albicans, Curvularia, A. niger, and Rhizopus) strains, respectively.

scholarly journals A New Method for the Deposition of Metallic Silver on Porous Ceramic Water Filters

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Kathryn N. Jackson ◽  
James A. Smith
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nitrate ◽  
Removal Rate ◽  
Aqueous Suspension ◽  
Porous Ceramic ◽  
New Method ◽  
Metallic Silver ◽  
E Coli ◽  
Filter Performance ◽  
Continuous Feed

A new method of silver application to a porous ceramic water filter used for point-of-use water treatment is developed. We evaluated filter performance for filters manufactured by the conventional method of painting an aqueous suspension of silver nanoparticles onto the filter and filters manufactured with a new method that applies silver nitrate to the clay-water-sawdust mixture prior to pressing and firing the filter. Filters were evaluated using miscible displacement flow-through experiments with pulse and continuous-feed injections of E. coli. Flow characteristics were quantified by tracer experiments using [3H]H2O. Experiments using pulse injections of E. coli showed similar performance in breakthrough curves between the two application methods. Long-term challenge tests performed with a continuous feed of E. coli and growth medium resulted in similar log removal rates, but the removal rate by nanosilver filters decreased over time. Silver nitrate filters provided consistent removal with lower silver levels in the effluent and effective bacterial disinfection. Results from continued use with synthetic groundwater over 4 weeks, with a pulse injection of E. coli at 2 and 4 weeks, support similar conclusions—nanosilver filters perform better initially, but after 4 weeks of use, nanosilver filters suffer larger decreases in performance. Results show that including silver nitrate in the mixing step may effectively reduce costs, improve silver retention in the filter, increase effective lifespan, and maintain effective pathogen removal while also eliminating the risk of exposure to inhalation of silver nanoparticles by workers in developing-world filter production facilities.

Green Synthesis of Silver Nanoparticles Using Prunus Amygdalus Extract and their Anti-Microbial Activity

2015 ◽  
Vol 1119 ◽  
pp. 165-169
Author(s):  
S.K. Srikar ◽  
D.D. Giri ◽  
C. Upadhyay ◽  
P.K. Mishra ◽  
S.N. Upadhyay
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nitrate ◽  
Single Step ◽  
Prunus Amygdalus ◽  
E Coli ◽  
Bacteriostatic Property ◽  
Silver Nitrate Concentration ◽  
Average Size ◽  
20 Nm ◽  
Sun Light

Highly stable silver nanoparticles synthesized in single-step green method by mixing silver nitrate and aqueous extract of Almond (Prunus amygdalus). Experiments were conducted to influence the change in the silver nitrate concentration and time on the synthesis of silver nanoparticles at room temperature under dispersed sun light. The almond extract acted both as the reducing and stabilizing agent for the synthesis of silver nanoparticles. The change in the color of the reaction mixture was monitored using UV-Visible spectrometry whereas particles synthesized were characterized using Scanning Electron Microscopy, Dynamic Light Scattering and Fourier Transform Infrared Spectroscopy. The synthesized nanoparticles were almost spherical in shape with an average size about 20 nm and they exhibited bacteriostatic property against E. coli.

Silver nanoparticles for printable electronics and biological applications

2009 ◽  
Vol 24 (9) ◽  
pp. 2828-2836 ◽  
Author(s):  
Krishna Balantrapu ◽  
Dan V. Goia
Keyword(s):  
Silver Nanoparticles ◽  
Alkaline Solutions ◽  
Metallic Silver ◽  
Experimental Conditions ◽  
Printable Electronics ◽  
Arabic Gum ◽  
Aqueous Dispersions ◽  
Conductive Films ◽  
Average Size ◽  
Concentrated Dispersions

An environmentally friendly route to prepare stable concentrated aqueous dispersions of silver nanoparticles is described. It was found that Arabic gum, a well known stabilizing agent, can also rapidly and completely reduce Ag2O to metallic silver in alkaline solutions (pH > 12.0) and elevated temperature (65 °C). The average size of the silver nanoparticles could be tailored from 10 to 30 nm by varying the experimental conditions. By hydrolyzing either enzymatically or chemically the polysaccharide, it was possible to isolate dispersed silver nanoparticles suitable for both biological and printable electronics applications. For the latter purpose, concentrated dispersions of silver particles were prepared and used for depositing thin uniform layers, which could be sintered into conductive films at low temperatures.

scholarly journals Anchoring silver nanoparticles on imidazolium-based poly(ionic liquid)s with engineered nanopores as an efficient carrier for anticancer drug controlled delivery with antimicrobial effect

2022 ◽  
Author(s):  
Ehsan Aliakbari ◽  
Reza Eghdam Zamiri ◽  
Mehri Mahdavi ◽  
Vahid Yousefi
Keyword(s):  
Drug Delivery ◽  
Silver Nanoparticles ◽  
Ionic Liquid ◽  
Antimicrobial Effect ◽  
Antibacterial Activities ◽  
E Coli ◽  
Ft Ir ◽  
Poly Ionic Liquid

Abstract Due to the significance of drug delivery, the design of novel progressive nanomaterials for targeting drug delivery is a significant role in pharmacotherapy, as this method is supposed to reach a more exact target. One of the most distinguished materials by researchers is the poly ionic liquid (PIL), which have been used as anticancer drugs carriers and notably improve the antitumor effect and half-life. In this work, an efficient and stable nanocarrier containing silver nanoparticle, which were well distributed throughout the ionic liquid-based copolymer network (PILP-Ag), was reported for the drug delivery with antimicrobial effect. PILP was synthesized by radical silver nanoparticles was anchored into PIL voids by in-situ reduction, which enrich the adsorption capability of drug and antimicrobial effect of the nanocarrier. The synthesized nanomaterials were characterized by various techniques such as BET, TGA, SEM, TEM, AAS and FT-IR spectroscopy. The antibacterial activities of the silver-containing PIL against both S. aureus and E. coli were studied by determination of the minimum inhibitory concentration and Minimum Bactericidal Concentration.

scholarly journals Synergistic Efficacy of Antibiotics and Silver Nanoparticles Synthesized from Eichhornia crassipes

2016 ◽  
Vol 6 ◽  
Author(s):  
S Basker
Keyword(s):  
Silver Nanoparticles ◽  
Eichhornia Crassipes ◽  
Bacterial Resistance ◽  
Synergistic Effects ◽  
Public Health Issue ◽  
Metallic Silver ◽  
Gram Positive ◽  
Zone Formation ◽  
Gram Negative ◽  
E Coli

<p><strong>The increasing prevalence of bacterial resistance has made an important public health issue in the present scenario.  Thus it is urging to develop alternate and more effective therapeutic strategies to treat both Gram-negative and Gram-positive microbes.</strong>  <strong>Now a days silver nanoparticles (AgNPs) synthesized biologically gaining much importance with different applications as they are nontoxic and eco-friendliness.</strong> <strong>The antimicrobial activity of biosynthesized silver nanoparticles synthesized from aqueous extracts of</strong><strong><em> Eichhornia crassipes</em></strong><strong> was evaluated with the panel of antibiotics </strong><strong>like vancomycin, penicillin, streptomycin and tetracycline</strong><strong> and microorganisms </strong><strong>in the category of either gram positive or gram negative type.</strong><strong> <em>E. coli</em> and <em>S. aureus </em>proved to be effective with highest zone formation. In addition, possible synergistic effects of antibiotics were loaded with standard concentration of 20</strong> <strong>μl</strong><strong> of AgNPs and the effect of inhibition was highest in the antibiotic Tetracycline followed by Streptomycin, Vancomycin and Penicillin with different tested microbes. </strong><strong>The synergistic association of antibiotics with biosynthesized metallic silver nanoparticles proved to be effective against the tested microbes than control. The antibiotics showed higher zone of inhibition when added to AgNPs.</strong></p>

scholarly journals Silver Nanoparticles as a New Generation of Antimicrobial Prophylaxis

2019 ◽  
pp. 266-276 ◽  
Author(s):  
Ilnur T. Garipov ◽  
Renat R. Khaydarov ◽  
Olga U. Gapurova ◽  
Rashid A. Khaydarov ◽  
Firdaus M. Lutfi ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Cotton Fabric ◽  
Ag Nanoparticles ◽  
Antimicrobial Prophylaxis ◽  
Silver Ions ◽  
Antimicrobial Effect ◽  
Water Soluble ◽  
Metallic Silver ◽  
Saprotrophic Fungi ◽  
Biofilm Growth

Over the last 20 years, metallic silver in the form of Ag nanoparticles has made a remarkable comeback as an example of a nanomaterial for control of microorganisms. The purpose of our study was a) to quantitatively estimate the antimicrobial effect of silver nanoparticles compared with that of silver ions and b) to check the efficacy of nanosilver as an antimicrobial agent against a range of microbes on the surface of water-soluble paint, 100% cotton fabric, and fibrous chemisorbent. Minimum inhibitory concentration tests quantitatively showed that Ag nanoparticles were less efficient than Ag+ ions against representatives of gram-positive / gram-negative bacteria and cosmopolitan saprotrophic fungi. Antifungal/antibacterial effects against Aspergillus niger, Penicillium phoeniceum, and Staphylococcus aureus were confirmed for nanosilver concentrations of even 1 μg/cm2 on the surface of cotton fabric and 0.8 μg/cm2 in water-soluble paint. As the concentration of nanosilver in water-soluble paint/cotton fabric was increased to 7 μg/cm2, the growth of Bacillus subtilis and Escherichia coli was suppressed as well. Microbiological tests conducted over a period of 60 days showed that there was no biofilm growth on the surface of a silver nanoparticle-coated fiber sorbent during its everyday operation as a household water treatment filter. Thus, silver nanoparticles as an add-on to water-soluble paints, textile fabrics or fiber chemisorbents had a remarkable antibacterial/antifungal effect, although some of the Ag nanoparticles were agglomerated into larger colloidal clusters

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