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112 results for “Silver nanoparticles”
Figure 2 in Silver nanoparticles as a potential nematicide against Meloidogyne graminicola
Figure 2: Ultra violet-visible (UV–Vis) spectra of silver nanoparticles (AgNP), AgNO3, H2O2, and commercial Silvox 500® showing the distinctive features of AgNP which is absent in Silvox 500®.
Figure 2 in Nitrogen-fixing Cyanothece sp. as a mixotroph and silver nanoparticle synthesizer: a multitasking exceptional cyanobacterium
Figure 2. Disc inhibition zone against MRSA Staphylococcus aureus using (a) gold nanoparticles, (b) silver nanoparticles, and (c) both silver nanoparticles and gold nanoparticles.
Figure 1 in The employment of a conformal polydopamine thin layer reduces the cytotoxicity of silver nanoparticles
Figure 1. Characterization of NPs: (a) UV-Vis absorption spectra of NPs, TEM images of PDOP (b and b ), AgNP (c and c ), and AgNP@PDOP NP (d and d ) systems at different 1 2 1 2 1 2 magnifications. Arrows indicate the thickness of the PDOP layer on the AgNPs.
Figure 3 in The employment of a conformal polydopamine thin layer reduces the cytotoxicity of silver nanoparticles
Figure 3. Representative inverted microscopy images of Caco2 cell lines after 24 h of NP exposures at different concentrations.
Figure 5 in Evaluation of chitosan and silver nanoparticles Against isolated pathogens from Mulberry Silkworm, Bombyx mori L. (Lepidoptera: Bombycidae) under laboratory conditions
Figure 5. TEM micrograph of chitosan nanoparticles prepared by ionic gelation method. Table 3. Antimicrobial activity of silver nanoparticles (µl) with different concentrations against fungal and bacterial isolates.
Figure 1 in Evaluation of chitosan and silver nanoparticles Against isolated pathogens from Mulberry Silkworm, Bombyx mori L. (Lepidoptera: Bombycidae) under laboratory conditions
Figure 1. Mean weight of healthy and infected fourth and fifth instar larvae of B. mori. Isolation and identification of bacterial isolates: Total of 7 bacterial were successfully isolated from the outer surface and the inner bоdy of silkworm larvae.
Data from: A novel strategy based on Zn(II) porphyrins and silver nanoparticles to photoinactivate Candida albicans
<p>Data supporting the figures presented in the research article "A novel strategy based on Zn(II) porphyrins and silver nanoparticles to photoinactivate <em>Candida albicans"</em></p> <p><strong>Background:</strong> Photodynamic inactivation (PDI) has been an attractive alternative to treat <em>Candida albicans</em> infections, especially considering the spread of resistant strains. The combination of the photophysical advantages of Zn(II) porphyrins (ZnPs) and the plasmonic effect of silver nanoparticles (AgNPs) has the potential to further improve PDI. In this context, this study aimed to evaluate PDI action in <em>C. albicans</em> using ZnTnHex-2-PyP<sup>4+</sup> or ZnTE-2-PyP<sup>4+</sup> associated with AgNPs. <strong>Methods:</strong> AgNPs stabilized with polyvinylpyrrolidone (PVP) were chosen to allow for (i) overlap between NP extinction and ZnP absorption spectra and (ii) favor AgNPs-ZnPs contact; prerequisites for exploring the plasmonic effect. Optical and zeta potential (ζ) characterizations were performed, and ROS generation was also evaluated. Yeasts were incubated with ZnPs alone or in combination with AgNPs (AgNPs-ZnPs systems), at various concentrations of ZnPs and two proportions of AgNPs, then irradiated with a blue LED. Interactions between yeasts and the systems (ZnP alone or AgNPs-ZnPs) were evaluated by fluorescence microscopy. <strong>Results:</strong> Subtle spectroscopic changes were observed for ZnPs after association with AgNPs, and the ζ analyses confirmed AgNPs-ZnPs interaction. PDI using ZnP-hexyl (0.8 µM) and ZnP-ethyl (5.0 µM) promoted a 3 and 2 log<sub>10</sub> reduction of yeasts, respectively. On the other hand, AgNPs-ZnP-hexyl (0.2 µM) and AgNPs-ZnP-ethyl (0.6 µM) systems led to complete fungal eradication under the same parameters and lower porphyrin concentrations. An increase in the ROS level was observed when ZnPs were associated with AgNPs. Enhanced interaction of yeasts with AgNPs-ZnPs was observed, when compared with ZnPs alone. <strong>Conclusion:</strong> We hypothesize that the plasmonic effect combined with the greater interactions between cells and AgNPs-ZnPs systems resulted in an efficient and improved <em>C. albicans</em> yeast PDI, encouraging further developments toward inactivation of resistant <em>Candida</em> spp.</p> <p> </p>
Data from: Optimisation of biogenic synthesis of silver nanoparticles from flavonoid-rich Clinacanthus nutans leaf and stem aqueous extracts
<p>BACKGROUND: Silver nanoparticles (AgNPs) are widely used in food industries, biomedical, dentistry, catalysis, diagnostic biological probes, and sensors. The use of plant extract for AgNPs synthesis eliminates the process of maintaining cell culture and the process could be scaled up under a non-aseptic environment. The purpose of this study is to determine the classes of phytochemicals, to biosynthesise and characterise the AgNPs using Clinacanthus nutans leaf and stem extracts. In this study, AgNPs was synthesised from the aqueous extracts of C. nutans leaves and stems through a non-toxic, cost effective and eco-friendly method.</p> <p>RESULTS: The formation of AgNPs was confirmed by UV-Vis spectroscopy, and the size of AgNP-L (leaf) and AgNP-S (stem) were 114 and 129 nm, respectively. Transmission electron microscopy (TEM) analysis showed spherical nanoparticles with AgNP-L and AgNP-S ranging from 10-300 nm and 10-180 nm; with zeta potentials of AgNP-L and AgNP-S at -42.8 and -43.9 mV, respectively. XRD analysis matched the face-centred cubic structure of silver and was capped with bioactive compounds. FTIR analysis revealed the presence of few functional groups of phenolic and flavonoid compounds. These functional groups act as reducing agents in AgNPs synthesis.</p> <p>CONCLUSION: This result showed that the biogenically synthesised nanoparticles reduced silver ions to silver nanoparticles in aqueous condition and the AgNPs formed were stable and less toxic.</p>
Dataset of paper "Predicting the size of silver nanoparticles synthesised in flow reactors: Coupling population balance models with fluid dynamic simulations"
<p>Dataset of paper "Predicting the size of silver nanoparticles synthesised in flow reactors: Coupling population balance models with fluid dynamic simulations"</p>
Supplementary Material for "Exposure Assessment & Risks associated to wearing silver nanoparticle-coated textiles"
<p>Calculation of release rate constants and parameters for the calculations of dermal exposure. Source code for Matlab.</p>
Figure 6 in Synthesis of silver nanoparticles using Lactobacillus bulgaricus and assessment of their antibacterial potential
Figure 6. EDS Analysis of AgNPs synthesized by Lactobacillus bulgaricus.
Figure 3 in Synthesis of silver nanoparticles using Lactobacillus bulgaricus and assessment of their antibacterial potential
Figure 3. Results of suspension at different AgNO 3 concentrations of Lactobacillus bulgaricus.
Figure 2 in The employment of a conformal polydopamine thin layer reduces the cytotoxicity of silver nanoparticles
Figure 2. Cell viability test of NP systems at different concentrations.
Figure 4 in Evaluation of chitosan and silver nanoparticles Against isolated pathogens from Mulberry Silkworm, Bombyx mori L. (Lepidoptera: Bombycidae) under laboratory conditions
Figure 4. Transmissiоn electron microscоpy micrоgraph of silver nanoparticles.
Figure 3 in Evaluation of chitosan and silver nanoparticles Against isolated pathogens from Mulberry Silkworm, Bombyx mori L. (Lepidoptera: Bombycidae) under laboratory conditions
Figure 3. Final dispersion formed after reduction (A) silver and (B) chitosan.
Proteomics reveals multiple effects of titanium dioxide and silver nanoparticles in the metabolism of turbot, Scophthalmus maximus
<p>Titanium dioxide (TiO2) and silver (Ag) NPs are among the most used engineered inorganic nanoparticles (NPs);<br> however, their potential effects to marine demersal fish species, are not fully understood. Therefore, this study<br> aimed to assess the proteomic alterations induced by sub-lethal concentrations citrate-coated 25 nm (“P25”) TiO2<br> or polyvinylpyrrolidone (PVP) coated 15 nm Ag NPs to turbot, Scophthalmus maximus. Juvenile fish were exposed<br> to the NPs through daily feeding for 14 days. The tested concentrations were 0, 0.75 or 1.5 mg of each NPs per kg of fish per day. The determination of NPs, Titanium and Ag levels (sp-ICP-MS/ICP-MS) and histological alterations<br> (Transmission Electron Microscopy) supported proteomic analysis performed in the liver and kidney.<br> Proteomic sample preparation procedure (SP3) was followed by LC-MS/MS. Label-free MS quantification<br> methods were employed to assess differences in protein expression. Functional analysis was performed using<br> STRING web-tool. KEGG Gene Ontology suggested terms were discussed and potential biomarkers of exposure<br> were proposed. Overall, data shows that liver accumulated more elements than kidney, presented more histological<br> alterations (lipid droplets counts and size) and proteomic alterations. The Differentially Expressed Proteins<br> (DEPs) were higher in Ag NPs trial. The functional analysis revealed that both NPs caused enrichment of<br> proteins related to generic processes (metabolic pathways). Ag NPs also affected protein synthesis and nucleic<br> acid transcription, among other processes. Proteins related to thyroid hormone transport (Serpina7) and calcium<br> ion binding (FAT2) were suggested as biomarkers of TiO2 NPs in liver. For Ag NPs, in kidney (and at a lower<br> degree in liver) proteins related with metabolic activity, metabolism of exogenous substances and oxidative stress<br> (e.g.: NADH dehydrogenase and Cytochrome P450) were suggested as potential biomarkers. Data suggests<br> adverse effects in turbot after medium/long-term exposures and the need for additional studies to validate<br> specific biological applications of these NPs.</p>
Detection of Silver Nanoparticles in Seawater Using Surface-Enhanced Raman Scattering
<p>Nanomaterials significantly contribute to the development of new solutions to improve consumer products properties. Silver nanoparticles (AgNPs) are one of the most used, and as human exposure to such NPs increases, there is a growing need for analytical methods to identify and quantify nanoparticles present in the environment. Here we designed a detection strategy for AgNPs in seawater using surface-enhanced Raman Scattering (SERS). Three commercial AgNPs coated with polyvinylpyrrolidone (PVP) were used to determine the relative impact of size (PVP-15nmAgNPs and PVP-100nmAgNPs) and aggregation degree (predefined Ag aggregates, PVP-50–80nmAgNPs) on the SERS-based detection method. The study of colloidal stability and dissolution of selected AgNPs into seawater was carried out by dynamic light scattering and UV-vis spectroscopy. We showed that PVP-15nmAgNPs and PVP-100nmAgNPs remained colloidally stable, while PVP-50–80nmAgNPs formed bigger aggregates. We demonstrated that the SERS-based method developed here have the capacity to detect and quantify single and aggregates of AgNPs in seawater. The size had almost no effect on the detection limit (2.15 ± 1.22 mg/L for PVP-15nmAgNPs vs. 1.51 ± 0.71 mg/L for PVP-100nmAgNPs), while aggregation caused an increase of 2.9-fold (6.08 ± 1.21 mg/L). Our results demonstrate the importance of understanding NPs transformation in seawater since this can influence the detection method performance.</p>
Bacterial mediated green synthesis of silver nanoparticles and their antibacterial and antifungal activities against drug-resistant pathogens
<p>In the healthcare sector, the production of bioactive silver nanoparticles (AgNPs) with antimicrobial properties is of great importance. In this study, a novel bacterial strain, <em>Paenibacillus</em> sp. MAHUQ-63, was identified as a potential candidate for facile and rapid biosynthesis of AgNPs. The synthesized AgNPs were used to control the growth of human pathogens, <em>Salmonella</em> Enteritidis and <em>Candida</em> <em>albicans</em>. The bacterial culture supernatant was utilized to synthesize the nanoparticles. FE-TEM examination showed spherical-shaped nanoparticles with 15 to 55 nm in size. FTIR analysis identified various functional groups. The synthesized AgNPs demonstrated remarkable activity against <em>S</em>. Enteritidis and <em>C. albicans</em>. The zone of inhibition (ZOI) for 100 µL (0.5 mg/mL) of AgNPs against <em>S</em>. Enteritidis and <em>Candida</em> <em>albicans</em> were 18.0 ± 1.0 and 19.5 ± 1.3 mm, respectively. The minimum inhibitory concentrations (MICs) were 25.0 and 12.5 μg/mL against <em>S</em>. Enteritidis and <em>Candida albicans</em>, respectively. Additionally, the minimum bactericidal concentrations (MBC) were 25.0 μg/mL against both pathogenic microbes. The FE-SEM analysis showed that the treatment of AgNPs caused morphological and structural damage to both <em>S</em>. Enteritidis and <em>Candida albicans</em>. Therefore, these AgNPs can be used as a new and effective antimicrobial agent.</p>
Data from: Microwave-assisted graphene oxide/carbon spheres with silver nanoparticles: Dual catalyst for peroxide detection and antibacterial use
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Data from: Optimisation of biogenic synthesis of silver nanoparticles from flavonoid-rich Clinacanthus nutans leaf and stem aqueous extracts
Open the record for dataset details and reuse information.
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