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Search for "silver ions" in Full Text gives 52 result(s) in Beilstein Journal of Nanotechnology.
Classification and application of metal-based nanoantioxidants in medicine and healthcare
Beilstein J. Nanotechnol. 2024, 15, 396–415, doi:10.3762/bjnano.15.36
- generating silver nanoparticles from silver ions, whereas hyaluronic acid enhanced hydrophilicity and strain activities. To enhance wound repair, metal or metal oxide-based nanoantioxidants can be conjugated with miRNA146a. Because of the capability of miRNA146a to downregulate IL-6 and IL-8 expression, this
Silver nanoparticles loaded on lactose/alginate: in situ synthesis, catalytic degradation, and pH-dependent antibacterial activity
Beilstein J. Nanotechnol. 2023, 14, 781–792, doi:10.3762/bjnano.14.64
- ionotropic gelation utilizing the biodegradable saccharides lactose (Lac) and alginate (Alg). The lactose reduced silver ions to form AgNPs. The crystallite structure of the nanocomposite AgNPs@Lac/Alg, with a mean size of 4–6 nm, was confirmed by analytical techniques. The nanocomposite exhibited high
- release of silver ions or electrostatic interaction between AgNPs and microbial cells, have been proposed [21][22]. The AgNPs might release silver ions capable of binding to nucleic acids, thereby, exhibiting antibacterial activity [23][24]. Consequently, any silver-containing composite material with
- antibacterial properties can serve as a source of silver ions. Another mechanism involves the electrostatic attraction between negatively charged microbial cells and positively charged AgNPs [25]. Because of their affinity to sulfur proteins and through electrostatic attraction, silver ions can bind to both
Antimicrobial and mechanical properties of functionalized textile by nanoarchitectured photoinduced Ag@polymer coating
Beilstein J. Nanotechnol. 2023, 14, 95–109, doi:10.3762/bjnano.14.11
- is denser than in the case of PEG600DA diacrylate monomer, which ultimately limits not only the increase in particle size but also the migration/diffusion of silver ions and NPs towards the surface. This affects the final thickness of the top metal layer, the depth of the concentration gradient and
- diffusion of silver ions towards the surface, resulting in the observed thin top metal layer (90 nm) of the Ag@PEG600DA/PETIA film, as confirmed in the TEM images (Figure 5). The metal layer is not thick enough to withstand the damage inflicted by the abrasion process. Rheological properties Potential
- evolution is observed between the growth inhibition and the released silver content. A complete inhibition was achieved for a silver quantity of 15 µg/g released in liquid media. As demonstrated by Hsueh et al. [55] AgNPs can be considered as containers continuously releasing silver ions, thus indirectly
In search of cytotoxic selectivity on cancer cells with biogenically synthesized Ag/AgCl nanoparticles
Beilstein J. Nanotechnol. 2022, 13, 1505–1519, doi:10.3762/bjnano.13.124
- crops increases the availability of Cl− in the soil and in the leaves of the plant. In this case, it is proposed that the synthesis of AgCl occurred by the interaction of the chloride ions present in the pineapple peel with the silver ions of AgNO3 as other authors have pointed out [31][32]. The high
Supramolecular assembly of pentamidine and polymeric cyclodextrin bimetallic core–shell nanoarchitectures
Beilstein J. Nanotechnol. 2022, 13, 1361–1369, doi:10.3762/bjnano.13.112
- obtained by the “seeded growth method” which consists in the sequential reduction of gold and silver ions. The co-reduction of the two metal ions (i.e., Ag+ and Au3+) produces an alloy instead [13]. In our ongoing research program aimed to the discovery of new antimicrobials, we recently explored the
- of NPs and that this step is preparatory for the subsequent deposition of the silver shell. Conversely, in the case of monometallic Ag NPs, the reduction of silver ions (usually mediated by ascorbic acid) takes place at sites which are not involved in the nucleation/growing process leading to poorly
- noble metal NPs produced by reduction of gold or silver ions with natural extracts have been proposed for the treatment of leishmaniasis, acting against both promastigote and amastigote forms of L. donovani [22][23]. Nanoantimicrobials originated from the combination of NPs with conventional
Bioselectivity of silk protein-based materials and their bio-inspired applications
Beilstein J. Nanotechnol. 2022, 13, 902–921, doi:10.3762/bjnano.13.81
Self-assembly of amino acids toward functional biomaterials
Beilstein J. Nanotechnol. 2021, 12, 1140–1150, doi:10.3762/bjnano.12.85
- , the substrate affinity of metal nanoparticles (1.53 mM) is comparable to that of natural lipase (1.27 mM). Metal ions, especially silver ions (Ag+), have been widely studied regarding antibacterial, antifungal, antiviral, anti-inflammatory, anti-angiogenic, and antitumor activities [63][64]. Silver
The role of deep eutectic solvents and carrageenan in synthesizing biocompatible anisotropic metal nanoparticles
Beilstein J. Nanotechnol. 2021, 12, 924–938, doi:10.3762/bjnano.12.69
- to control the reaction parameters for synthesizing nanomaterials of desired sizes and shapes. The method employs a growth solution consisting of the respective metal salt, a weak reducing agent, a structure-directing agent (predominantly quaternary ammonium surfactants) and silver ions for
- their antibacterial activity, are used in healthcare and the food industry, especially in manufacturing packaging materials. However, the cytotoxicity due to the release of the silver ions from AgNPs is a matter of concern. The cytotoxicity of micrometer-sized AgNPs was minimized by immobilizing them in
Silver nanoparticles nucleated in NaOH-treated halloysite: a potential antimicrobial material
Beilstein J. Nanotechnol. 2021, 12, 798–807, doi:10.3762/bjnano.12.63
- strongly inhibit the growth of common microorganisms and that they may be used as an alternative way to overcome bacterial resistance to antibiotics [10][11]. This is due to a combination of antimicrobial mechanisms including the generation of reactive oxygen species (ROS) and the diffusion of silver ions
- antimicrobial effect against E. coli and S. aureus can be explained by morphological differences between the two bacteria. As Gram-positive bacteria, S. aureus has a thicker cell wall than E. coli, and thus the silver ions penetrate into the cells at a lower rate. Those results are consistent with the expected
Silver nanoparticles induce the cardiomyogenic differentiation of bone marrow derived mesenchymal stem cells via telomere length extension
Beilstein J. Nanotechnol. 2021, 12, 786–797, doi:10.3762/bjnano.12.62
- , which is likely due to complexion of the released silver ions [36]. To explore the effect of Ag-NPs on the cardiomyogenic differentiation of BM-MSCs, we investigated the protein expressions of C-TnI, GATA4, SMA, VEGF, and VWF, as well as those of TERT and cyline D1 in response to Ag-NP treatment. It was
On the stability of microwave-fabricated SERS substrates – chemical and morphological considerations
Beilstein J. Nanotechnol. 2021, 12, 541–551, doi:10.3762/bjnano.12.44
- typical heating process) which initiates the reduction of the silver salt by ethanol. This triggers a short burst of silver nanoparticle nucleation, which forms reaction seeds on the glass substrate. The strong affinity of the silver ions for the free hydroxyl groups of glass surfaces allows for the
- attachment of the nanoparticles to the substrate and the glass surface of the microwave reaction vial. An accompanied rapid growth phase, resulting from the high microwave absorption capabilities of the seeds, stimulates the further reduction of the available silver ions on the seed surface. For the
- Raman intensities. This might be explained by the fact that they retain their irregular nanoparticle structure (Supporting Information File 1, Figure S3). Moreover, DMSO can be considered as an active reducing agent for silver ions under suitable conditions [32]. Thus, Ag+ ions (which can be formed by
A review on nanostructured silver as a basic ingredient in medicine: physicochemical parameters and characterization
Beilstein J. Nanotechnol. 2021, 12, 440–461, doi:10.3762/bjnano.12.36
- from the damaged respiratory chain since they depend on thiol groups which are occupied by silver ions. The increase in superoxide and hydrogen peroxide anions in the reaction with iron (Fenton reaction), according to Equation 2 [104] and as described in Figure 6, are indicative of the deleterious
- carrier gas to expel all dissolved oxygen (to prevent oxidation and release of silver ions) reported no reduction in cell viability compared to control [127]. Treatment of burns in rats with AgNPs were carried out both in vitro and in vivo. No significant differences in the levels of urea, creatinine, and
Characterization, bio-uptake and toxicity of polymer-coated silver nanoparticles and their interaction with human peripheral blood mononuclear cells
Beilstein J. Nanotechnol. 2021, 12, 282–294, doi:10.3762/bjnano.12.23
- , characterization, and study of transformations to obtain a better understanding of NP uptake and toxicity. Statistical analysis indicated that there might be an individual variability in response to NPs, although more research is required. Keywords: human peripheral blood mononuclear cells; silver ions; silver
A review on the green and sustainable synthesis of silver nanoparticles and one-dimensional silver nanostructures
Beilstein J. Nanotechnol. 2021, 12, 102–136, doi:10.3762/bjnano.12.9
- anode, and an electron exchange takes place in the plasma region where silver ions are reduced [129]. In the case of silver electrodes, silver will be melted and vaporized from the electrode ends, and as a result, nanoparticles are formed from the silver condensates [131]. Tien et al. [227] synthesized
- fatty acids in a hydrophobic solvent such as alkanes [235]. There is a water phase inside the microemulsions which is also referred to as the water pool where the reactants are present [235]. The water pool is where the silver ions are reduced into silver atoms which then form AgNPs [152]. The reverse
High-responsivity hybrid α-Ag2S/Si photodetector prepared by pulsed laser ablation in liquid
Beilstein J. Nanotechnol. 2020, 11, 1596–1607, doi:10.3762/bjnano.11.142
- vibration and silver material is expelled from the target surface in the form of a plasma plum. Thus, silver ions Ag+ and sulfur ions S2− are produced from silver target and thiourea solution, respectively. They form Ag2S NPs according to the following chemical reaction [21]: Figure 3 shows the XRD patterns
Antimicrobial metal-based nanoparticles: a review on their synthesis, types and antimicrobial action
Beilstein J. Nanotechnol. 2020, 11, 1450–1469, doi:10.3762/bjnano.11.129
- in microorganism-catalyzing metabolic reactions and are a fundamental part of cellular structures. Proteomic analysis has revealed deregulation in proteins involved in nitrogen metabolism, electron transfer, and substance transport in the presence of CuO NPs [164]. Silver ions released from Ag NPs
Photothermally active nanoparticles as a promising tool for eliminating bacteria and biofilms
Beilstein J. Nanotechnol. 2020, 11, 1134–1146, doi:10.3762/bjnano.11.98
- plasmonic MoO3−x nanosheets were designed to be a highly efficient NIR-driven antibacterial agent [100]. This approach enhanced the nanocube antibacterial activity towards E. coli and S. aureus upon NIR light irradiation due to the local temperature increase, release of silver ions and bacterial membrane
Gram-scale synthesis of splat-shaped Ag–TiO2 nanocomposites for enhanced antimicrobial properties
Beilstein J. Nanotechnol. 2020, 11, 1119–1125, doi:10.3762/bjnano.11.96
- the Gram-positive bacteria S. aureus. During the incubation with Ag–TiO2 nanocomposites, the silver ions were released from the NCs and gradually diffused out in the seeded agar. Then, the silver ions attached to the bacterial membrane, damaging the proteins and inactivating the bacteria metabolism
Silver-decorated gel-shell nanobeads: physicochemical characterization and evaluation of antibacterial properties
Beilstein J. Nanotechnol. 2020, 11, 620–630, doi:10.3762/bjnano.11.49
- of composite nanobeads with antibacterial properties. The particles consist of polystyrene cores that are surrounded by sulfonic gel shells with embedded silver nanoparticles. The nanocomposite beads are prepared by sulfonation of polystyrene particles followed by accumulation of silver ions in the
- shell layer and subsequent reduction with sodium borohydride. The resulting material has been characterized by electron microscopy, vibrational and X-ray photoelectron spectroscopy and several other experimental techniques. It was shown that sodium borohydride reduces silver ions embedded in the gel
- charged sulfonic groups. The gel shell can be utilized for the accumulation of cationic species, e.g., the accumulation of a monomer followed by further polymerization [2][22]. Polystyrene-based gel-shell particles have been also used for the accumulation of silver ions followed by their reduction to
Nanoparticles based on the zwitterionic pillar[5]arene and Ag+: synthesis, self-assembly and cytotoxicity in the human lung cancer cell line A549
Beilstein J. Nanotechnol. 2020, 11, 421–431, doi:10.3762/bjnano.11.33
- toxicity of Ag+ ions, multicore complexes prepared on the basis of macrocyclic ligands [9][10][11][12][13] and silver ions are of greatest interest. The ability of macrocyclic systems to form supramolecular associates, due to noncovalent interactions with Ag+, can reduce toxicity and preserve the
- the stability of supramolecular assemblies to pH changes [22][23]. Another remarkable property of sulfobetaine fragments is the ability to interact with silver ions [24][25][26] and participate in the stabilization of quantum dots [27]. It is worth noting that the use of polymer systems containing
- macrocycle 3, in the presence of an excess of AgNO3, stable nanoparticles are formed, we further studied the ability of the 3/Ag+ associates to reduce the toxicity of Ag+ for eukaryotic cells. We first carried out the calculation of the minimum inhibitory concentration for silver ions. The minimum inhibitory
Gold and silver dichroic nanocomposite in the quest for 3D printing the Lycurgus cup
Beilstein J. Nanotechnol. 2020, 11, 16–23, doi:10.3762/bjnano.11.2
- variations, we found that reducing silver ions at room temperature immediately followed by an addition of a polyvinylpyrrolidone (PVP) solution formed dichroic silver nanoparticles in minutes. The addition of the reducing agent (NaBH4) to a silver nitrate solution forms nanoclusters, and the immediate
Toxicity and safety study of silver and gold nanoparticles functionalized with cysteine and glutathione
Beilstein J. Nanotechnol. 2019, 10, 1802–1817, doi:10.3762/bjnano.10.175
- ). The dissolution behavior of AuNPs and AgNPs was tested by ultrafiltration followed by quantification of released free gold or silver ions. The test media were UPW, cell culture medium EMEM with the addition of 10% FBS, and standard culture media for Daphnia magna cultivation (SCM). Freshly prepared
Enhanced inhibition of influenza virus infection by peptide–noble-metal nanoparticle conjugates
Beilstein J. Nanotechnol. 2019, 10, 1038–1047, doi:10.3762/bjnano.10.104
- demonstrate that conjugation of FluPep to gold and silver nanoparticles enhances its antiviral potency; the antimicrobial activity of silver ions may enable the design of even more potent antimicrobial inhibitors, capable of targeting both influenza and bacterial co-infections. Keywords: antiviral peptides
Comparative biological effects of spherical noble metal nanoparticles (Rh, Pd, Ag, Pt, Au) with 4–8 nm diameter
Beilstein J. Nanotechnol. 2018, 9, 2763–2774, doi:10.3762/bjnano.9.258
- oxidative release of silver ions [38][39][40][41][42][43], which may affect biological systems in different ways, for example, by disruption of the cell wall or by interaction with cellular enzymes [44]. However, it is often difficult to compare literature reports because typically only nanoparticles of one
- concentration from 25 to 50 µg mL−1 (Figure 7). These effects are well known for silver, silver chloride and silver ions [33][38][44][92]. Cell detachment was only observed at toxic concentrations of silver nanoparticles (25 to 50 µg mL−1), but not at subtoxic concentrations (2.5 to 10 µg mL−1). Thus, cell
- the toxicity of silver nanoparticles is due to the oxidative release of silver ions [38][39][40][43][67][94][95][96][97][98][99][100], we can tentatively assume that such a dissolution does not occur for the more noble metals, and that the nanoparticles themselves are not cytotoxic. Due to the more
SERS active Ag–SiO2 nanoparticles obtained by laser ablation of silver in colloidal silica
Beilstein J. Nanotechnol. 2018, 9, 2396–2404, doi:10.3762/bjnano.9.224
- occurs when silver ions are chemically reduced), as proposed in several papers [17][18][19][20][21][22][23]. Here, we have ablated a silver target in a colloidal silica solution by nanosecond pulsed laser ablation and have verified the presence of Ag nanoparticles by UV–visible absorption spectroscopy
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