scholarly journals Effect of Exchangeable Ions in Natural and Modified Zeolites on Ag Content, Ag Nanoparticle Formation and Their Antibacterial Activity

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4153
Author(s):  
Neli Mintcheva ◽  
Marinela Panayotova ◽  
Gospodinka Gicheva ◽  
Orlin Gemishev ◽  
Georgy Tyuliev
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Agents ◽  
Diffuse Reflectance ◽  
Antibacterial Properties ◽  
Silver Ions ◽  
Modified Zeolite ◽  
End Of Treatment ◽  
Modified Zeolites ◽  
Size And Morphology ◽  
Microscopic Techniques

To broaden the application of silver nanoparticles (AgNPs), which are well-known antibacterial agents, they are supported on different substrates to prevent aggregation, increase their surface area and antibacterial efficiency, and to be separated from the system more effectively at the end of treatment. To produce nanocomposites that consist of silver nanoparticles on natural and modified zeolites, silver ions (Ag+) were loaded onto zeolite (natural, Na-modified, H-modified) and then thermally reduced to AgNPs. The effect of the exchangeable cations in zeolite on Ag+ uptake, AgNPs formation, size and morphology was investigated by the TEM, SEM, EDX, XPS, UV-vis, XRD and BET methods. The silver amount in the nanocomposites decreased in the following order Na-modified zeolite > natural zeolite > H-modified zeolite. Microscopic techniques showed formation of AgNPs of 1–14 nm on natural and Na-modified zeolite, while the diameter of metal particles on H-modified zeolite was 12–42 nm. Diffuse reflectance UV-vis and XPS methods revealed the presence of both silver ions and AgNPs in the materials indicating that partial reduction of Ag+ ions took place upon heating at 400 °C in air. Additionally, antibacterial properties of the nanocomposites were tested against Escherichia coli, and it was found that Ag–containing composites originating from the Na-modified zeolite demonstrated the highest activity.

Immobilization of Silver Nanoparticles on Chitosan-Coated Silica-Gel-Beads and the Antibacterial Activity

2021 ◽  
Vol 892 ◽  
pp. 36-42
Author(s):  
Muhammad Iqbal Hidayat ◽  
Muhammad Adlim ◽  
Ilham Maulana ◽  
Muhammad Zulfajri
Keyword(s):  
Silver Nanoparticles ◽  
Silica Gel ◽  
Low Cost ◽  
Antibacterial Properties ◽  
Chitosan Film ◽  
Silver Ions ◽  
Filter Material ◽  
Silver Ion ◽  
Gel Beads ◽  
Metal Colloid

Silver nanoparticles (Ag0) have attracted the most attention due to their broad antimicrobial application and outstanding activity. The silver nanoparticles are usually in colloidal form, then immobilization the colloid onto solid support is still interesting to explore. In this work, a new method for silver colloidal nanoparticle immobilization on silica gel beads (SiG), which was then symbolized as Ag0-[chi-SiG] was conducted and characterized successfully. The finding proved that SiG must be coated with three chitosan film layers to give stable support for silver nanoparticles. This coating method caused the chitosan completely covered SiG, and the chitosan film provides coordination bonding for silver ions. The most appropriate solvent for silver ion impregnation on the surface of chi-SiG is methanol compared to other solvents. Tungsten lamp as the photo-irradiation, which is low cost and environmentally friendly has been proven effective for silver ion reduction, as shown by silver metal colloid UV-Vis surface plasmon resonance at 400-700 nm. Ag0-[chi-SiG] showed the antibacterial properties of inhibiting the growth Staphylococcus aureus and Escherichia coli; then it provides the potential application for antibacterial filter material. According to the weight comparison between antibacterial standard and Ag content, then Ag0-[chi-SiG] has two and five times higher of exhibiting zone for each bacteria.

scholarly journals Limitations of Recent Studies Dealing with the Antibacterial Properties of Silver Nanoparticles: Fact and Opinion

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1775 ◽  
Author(s):  
Raphaël E. Duval ◽  
Jimmy Gouyau ◽  
Emmanuel Lamouroux
Keyword(s):  
Silver Nanoparticles ◽  
Infectious Diseases ◽  
Metallic Nanoparticles ◽  
Bacterial Infections ◽  
Antibacterial Agents ◽  
Therapeutic Option ◽  
Antibacterial Properties ◽  
Antimicrobial Activities ◽  
Synthetic Process ◽  
Great Heterogeneity

Due to the constant increase in the number of infectious diseases and the concomitant lack of treatment available, metallic nanoparticles (e.g., silver nanoparticles) have been of particular interest in the last decades. Indeed, several studies suggest that silver nanoparticles have valuable antimicrobial activities, especially against bacteria, which may lead us to think that these nanoparticles may one day be an attractive therapeutic option for the treatment of bacterial infections. Unfortunately, when we look a little closer to these studies, we can see a very great heterogeneity (e.g., in the study design, in the synthetic process of nanoparticles, in the methods that explore the antibacterial properties of nanoparticles and in the bacteria chosen) making cross-interpretation between these studies impossible, and significantly limiting the interest of silver nanoparticles as promising antibacterial agents. We have selected forty-nine international publications published since 2015, and propose to discuss, not the results obtained, but precisely the different methodologies developed in these publications. Through this discussion, we highlighted the aspects to improve, or at least to homogenize, in order to definitively establish the interest of silver nanoparticles as valuable antibacterial agents.

scholarly journals Study of Antibacterial Properties of Ziziphus mauritiana based Green Synthesized Silver Nanoparticles against Various Bacterial Strains

2020 ◽  
Vol 12 (4) ◽  
pp. 1484 ◽  
Author(s):  
M. Asimuddin ◽  
Mohammed Rafi Shaik ◽  
Neeshat Fathima ◽  
M. Shaistha Afreen ◽  
Syed Farooq Adil ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Metallic Nanoparticles ◽  
Low Cost ◽  
Preliminary Investigation ◽  
Antibacterial Properties ◽  
Silver Ions ◽  
Ziziphus Mauritiana ◽  
Bacterial Strains ◽  
Vis Spectroscopy ◽  
Ft Ir

Due to their low cost and environmentally friendly nature, plant extracts based methods have gained significant popularity among researchers for the synthesis of metallic nanoparticles. Herein, green synthesis of silver nanoparticles was performed using the aqueous solution of Ziziphus mauritiana leaves extract (ZM-LE) as a bio-reducing agent. The as-obtained silver nanoparticles were characterized by using UV-Vis spectroscopy, XRD (X-ray diffraction), TEM (transmission electron microscopy), and FT-IR (Fourier-transform infrared spectroscopy). In addition, the effects of the concentrations of the leaves extract, silver nitrate, and the temperature on the preparation of nanoparticles were also investigated. In order to determine the nature of secondary metabolites present in leaves extract, a preliminary investigation of phytoconstituents was carried out using different methods including Folin-Ciocalteu and AlCl3 methods. The results have indicated the presence of a considerable amount of phenolic and flavonoid contents in the leaves extract, which are believed to be responsible for the reduction of silver ions and stabilization of resulting nanoparticles. Indeed, the FT-IR spectrum of silver nanoparticles also confirmed the presence of residual phytomolecules of leaves extract as stabilizing ligands on the surface of nanoparticles. The antibacterial properties of as-obtained silver nanoparticles were tested against various bacterial strains including Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, and Bacillus subtilis. The nanoparticles strongly inhibited the growth of S. aureus with a minimum inhibitory concentration (MIC) of 2.5 μg/ml and moderately inhibited the growth of E. coli with a MIC of 5 μg/ml.

Antibacterial properties of biosynthesized silver nano particles

2020 ◽  
Vol 4 (1) ◽  
pp. 1-5
Author(s):  
Krishna Reddy BV ◽  
Avinash Kumar G ◽  
Nageswara Rao G
Keyword(s):  
Staphylococcus Aureus ◽  
Silver Nanoparticles ◽  
Large Scale ◽  
Leaf Extract ◽  
Antibacterial Agents ◽  
Uv Spectroscopy ◽  
Antibacterial Properties ◽  
Nano Particles ◽  
Lannea Coromandelica ◽  
Cost Efficacy

Nanoparticles have their demand in various fields of science and technology and their applications extend even in medical and pharmaceutical arena. They have been used as preservatives, diagnosing aids and potent antibacterial agents. But their production is a serious matter of concern when it comes to cost, efficacy and toxicity issues. Overcoming these limitations green synthesis has taken its advantage for their commercial and large scale synthesis. This research will focus on the preparation of nano particles of silver with the help of purified leaf extract from Lannea coromandelica and evaluation of the same using UV-Vis Spectrophotometry. The nanoparticles exhibited surface plasmon resonance at 420nm in UV spectroscopy. Futhermore, nanoparticles have been evaluated for their antibacterial activity on Putida vulgaris, Staphylococcus aureus, and Bacillus subtillis. The results proved the eco friendly synthesized silver nanoparticles have a good antibacterial and can be used effectively in therapies targeting infections and infectious wounds.

scholarly journals Synthesis of Gold Nanobipyramids by Seed-mediated Method and Santibacterial Activities

2018 ◽  
Vol 28 (2) ◽  
pp. 179 ◽  
Author(s):  
Ngo Vo Ke Thanh ◽  
Huynh Trong Phat ◽  
Nguyen Thi Kim Anh ◽  
Nguyen Dang Giang ◽  
Lam Quang Vinh
Keyword(s):  
Silver Nanoparticles ◽  
Metallic Nanoparticles ◽  
Cetyltrimethylammonium Bromide ◽  
Antibacterial Agents ◽  
Antibacterial Properties ◽  
Antibacterial Activities ◽  
Seed Mediated ◽  
Antibacterial Nanoparticles ◽  
Gold Nanobipyramids ◽  
And Staphylococcus Aureus

Metallic nanoparticles as antibacterial agents have been studied for several years. The most used antibacterial nanoparticles are silver nanoparticles. The mechanisms and  antibacterial properties of silver nanoparticles are well known, but the effects of gold nanoparticles, especially gold Nano bipyramids, are not considered. In this research, we synthesized gold nanobipyramids (NBPs) by seed mediated method using surfactant cetyltrimethylammonium bromide (CTAB). After preparing, gold nanobipyramids is removed CTAB and modified the surface using polyethylene glycol, polyvinyl alcohol and chitosan as the stabilizers. Besides, antibacterial effects of gold nanobipyramids on both Escherichia coli (Gram negative) and Staphylococcus aureus (Gram positive) are investigated in this paper. The results show that gold nanobipyramids have good antibacterial activities even at low concentration. The optimal concentration of stabilizers and gold nanobipyramids in antibacterial activities are also studied in this paper.

scholarly journals Printable Resin Modified by Grafted Silver Nanoparticles for Preparation of Antifouling Microstructures with Antibacterial Effect

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3838
Author(s):  
Hazem Idriss ◽  
Roman Elashnikov ◽  
Silvie Rimpelová ◽  
Barbora Vokatá ◽  
Petr Haušild ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Effect ◽  
Low Cost ◽  
Antibacterial Properties ◽  
Silver Ions ◽  
Polymerization Process ◽  
Resin Matrix ◽  
Bacterial Strains ◽  
Ion Release ◽  
3D Printed

The usage of three-dimensional (3D) printed materials in many bioapplications has been one of the fastest-growing sectors in the nanobiomaterial industry in the last couple of years. In this work, we present a chemical approach for grafting silver nanoparticles (AgNPs) into a resin matrix, which is convenient for 3D printing. In this way, the samples can be prepared and are able to release silver ions (Ag+) with excellent antibacterial effect against bacterial strains of E. coli and S. epidermidis. By the proposed process, the AgNPs are perfectly mixed and involved in the polymerization process and their distribution in the matrix is homogenous. It was also demonstrated that this approach does not affect the printing resolution and the resin is therefore suitable for the construction of microstructures enabling controlled silver ion release and antifouling properties. At the same time the physical properties of the material, such as viscosity and elasticity modulus are preserved. The described approach can be used for the fabrication of facile, low-cost 3D printed resin with antifouling-antibacterial properties with the possibility to control the release of Ag+ through microstructuring.

Characterization and antibacterial properties of Eriobotrya japonica extract loaded silver-nanoparticles

2020 ◽  
Vol 16 ◽  
Author(s):  
Arfaa Sajid ◽  
Qaisar Manzoor ◽  
Anam Sajid ◽  
Muhammad Imran ◽  
Shanza Khalid ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Antibacterial Properties ◽  
Antimicrobial Properties ◽  
Silver Ions ◽  
Eriobotrya Japonica ◽  
X Ray Diffraction ◽  
Effective Utilization ◽  
E Coli ◽  
Elongated Nanoparticles

Background:: Currently, developing methods for the formation of nanoparticles with antimicrobial properties based on green chemistry are the research hotspots. In this research green biosynthesis of Eriobotrya japonica extract loaded silver nanoparticles and their characterization were the main objectives to achieve. Methods:: Green synthesis of E. japonica leaves extract-loaded silver nanoparticles (AgNPs) was carried out and its effect on bacterial growth was examined. The reduction of silver ions in solution was observed using UV-Vis spectrophotometer. The properties of AgNPs were assessed using Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). Also, their antibacterial effects were checked against Staphylococcus aureus and Escherichia coli. Results:: It was revealed that 5-50 nm sized spherical to elongated nanoparticles were synthesized that possessed comparatively better antibacterial potential against E. coli and S. aureus than conventional extract of the E. japonica leaves. Conclusions:: Green synthesis and effective utilization of Eriobotrya japonica extract loaded silver nanoparticles is a promising approach for nanoparticle production avoiding negative environmental impacts.

Effect of silver nanoparticles on biofilms of microorganisms (review)

10.12737/8117 ◽  
2015 ◽  
Vol 9 (1) ◽  
pp. 0-0
Author(s):  
Гладких ◽  
P. Gladkikh
Keyword(s):  
Silver Nanoparticles ◽  
High Efficiency ◽  
Antibacterial Properties ◽  
Silver Ions ◽  
Experimental Models ◽  
Human Pathogens ◽  
Antibiotic Resistant ◽  
Medical Supplies ◽  
Antibiotic Drugs

Nanotechnology enter in all spheres of human activity, particularly in medicine. Using nanoprogress allows the use of various nanostructures in the traditional methods therapy of various pathologies. The growing resistance to antibiotic drugs among human pathogens strains of microorganisms requires the development of alternatives. Silver nanoparticles are current contenders for the role of an alternative to modern antibiotics. They are able to transfer therapeutic agents, act on the membrane of microbial cells, disrupting their livelihoods and leading to death, as they are less toxic than silver ions. The use of nanoparticles is an effective tool in combating formed biofilms on medical supplies, and prevent to their education. Nanoparticles have proved positively against many antibiotic-resistant strains of microorganisms, including planktonic phase P. aureginosa. Synergistic effect observed while using of nanoparticles and various antibiotics. Antibacterial properties studied in experimental models of peritonitis and meningoencephalitis. In case of peritonitis high efficiency.

scholarly journals Effects of Polydopamine Microspheres Loaded with Silver Nanoparticles on Lolium multiflorum: Bigger Size, Less Toxic

Toxics ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 151
Author(s):  
Xinrui Wang ◽  
Hongyong Luo ◽  
Weihua Zheng ◽  
Xinling Wang ◽  
Haijun Xiao ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Shoot Growth ◽  
Antibacterial Property ◽  
Lolium Multiflorum ◽  
Rapid Development ◽  
Antibacterial Properties ◽  
Silver Ions ◽  
Green Method ◽  
Adverse Impacts ◽  
Root And Shoot Growth

The rapid development of nanotechnology and its widespread use have given rise to serious concerns over the potential adverse impacts of nanomaterials on the Earth’s ecosystems. Among all the nanomaterials, silver nanoparticles (AgNPs) are one of the most extensively used nanomaterials due to their excellent antibacterial property. However, the toxic mechanism of AgNPs in nature is still unclear. One of the questions under debate is whether the toxicity is associated with the size of AgNPs or the silver ions released from AgNPs. In our previous study, a sub-micron hybrid sphere system with polydopamine-stabilized AgNPs (Ag@PDS) was synthesized through a facile and green method, exhibiting superior antibacterial properties. The current study aims to explore the unique toxicity profile of this hybrid sphere system by studying its effect on germination and early growth of Lolium multiflorum, with AgNO3 and 15 nm AgNPs as a comparison. The results showed the seed germination was insensitive/less sensitive to all three reagents; however, vegetative growth was more sensitive. Specifically, when the Ag concentration was lower than 40 mg/L, Ag@PDS almost had no adverse effects on the root and shoot growth of Lolium multiflorum seeds. By contrast, when treated with AgNO3 at a lower Ag concentration of 5 mg/L, the plant growth was inhibited significantly, and was reduced more in the case of AgNP treatment at the same Ag concentration. As the exposures of Ag@PDS, AgNO3, and AgNPs increased, so did the Ag content in the root and shoot. In general, Ag@PDS was proven to be a potential useful hybrid material that retains antibacterial property with light phytotoxicity.

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