Optical and Structural Properties of PVA Capped Gold Nanoparticles and Their Antibacterial Efficacy

Borse, S.V.; Joshi, SatyawatiS.

doi:10.1166/acl.2013.1007

Cited by 7 publications

(3 citation statements)

References 37 publications

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“…Based on these two kinds of chemical bonds, many stable structures like “egg box” were formed by SA chains [ 23 ]. In the next step, PVA chains were physically crosslinked with SA-AuNPs due to the coordination interaction between sodium alginate-capped AuNPs and hydroxyl groups of PVA [ 30 ]. Then the hydrogel matrix dispersion prepared was cast on the bottom of glass beakers and allowed the solvent to evaporate and dry until the formation of the membranes.…”

Section: Resultsmentioning

confidence: 99%

Cr(III) Ion-Imprinted Hydrogel Membrane for Chromium Speciation Analysis in Water Samples

Dakova

Vasileva

Karadjova

2022

Gels

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Novel Cr(III)-imprinted poly(vinyl alcohol)/sodium alginate/AuNPs hydrogel membranes (Cr(III)-IIMs) were obtained and characterized and further applied as a sorbent for chromium speciation in waters. Cr(III)-IIMs were prepared via solution blending method using blends of poly(vinyl alcohol) and sodium alginate as film-forming materials, poly(ethylene glycol) as a porogen agent, sodium alginate stabilized gold nanoparticles (SA-AuNPs) as a crosslinking and mechanically stabilizing component, and Cr(III) ions as a template species. The physicochemical characteristics of pre-synthesized AuNPs and obtained hydrogel membranes Cr(III)-IIM were studied by UV-vis and FTIR spectroscopy, TEM and SEM observations, N2 adsorption–desorption measurements, and XRD analysis. The mechanism of the adsorption process toward Cr(III) was best described by pseudo-first-order kinetic and Langmuir models. Experiments performed showed that quantitative retention of Cr(III) is attained in 20 h at pH 6 and temperature 40 °C. Under the same conditions, the adsorption of Cr(VI) is below 5%. A simple and sensitive analytical procedure was developed for the speciation of Cr in an aquatic environment using dispersive solid phase extraction of Cr(III) by Cr(III)-IIM prior to selective Cr(VI) measurement by ETAAS in the supernatants. The detection limits and reproducibility achieved for the Cr speciation analysis fulfill the requirements for their monitoring in waters under the demand of the Water Framework Directive.

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Section: Resultsmentioning

confidence: 99%

Cr(III) Ion-Imprinted Hydrogel Membrane for Chromium Speciation Analysis in Water Samples

Dakova

Vasileva

Karadjova

2022

Gels

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“…They were analyzed through FE-TEM ( Figure S2 ). The AuNPs used in the LSPR sensor chip had a generally uniform size of 12.32 ± 1.01 nm ( Figure S2a ) with a lattice spacing of 0.23 nm, which was matched with the (111) crystal plane, indicating that the synthesized AuNPs were suitable ( Figure S2b ) [ 33 ]. The LSPR chip’s size measurements were precisely maintained according to the size of the UV cuvette cell to fabricate a highly stable and robust cuvette-type LSPR sensor for easy handling while testing with a UV–Vis spectrophotometer.…”

Section: Resultsmentioning

confidence: 99%

Highly Specific Peptide-Mediated Cuvette-Form Localized Surface Plasmon Resonance (LSPR)-Based Fipronil Detection in Egg

et al. 2022

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Herein, we have developed peptide-coated gold nanoparticles (AuNPs) based on localized surface plasmon resonance (LSPR) sensor chips that can detect fipronil with high sensitivity and selectivity. The phage display technique has been exploited for the screening of highly specific fipronil-binding peptides for the selective detection of the molecule. LSPR sensor chips are fabricated initially by attaching uniformly synthesized AuNPs on the glass substrate, followed by the addition of screened peptides. The parameters, such as the peptide concentration of 20 µg mL−1 and the reaction time of 30 min, are further optimized to maximize the efficacy of the fabricated LSPR sensor chips. The sensing analysis is performed systematically under standard fipronil solutions and spike samples from eggs. The developed sensor has shown excellent sensitivity towards both standard solutions and spike samples with limit of detection (LOD) values of 0.01 ppb, respectively. Significantly, the developed LSPR sensor chips offer distinct features, such as a facile fabrication approach, on-site sensing, rapid analysis, cost-effectiveness, and the possibility of mass production, in which the chips can be effectively used as a promising and potential on-site detection tool for the estimation of fipronil.

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“…Similar results were found for hybrid Tyrosine-capped Ag-H 3 PW 12 O 40 and Ag-H 3 PMo 12 O 40 NP systems, in which neither of the two pristine POMs exhibited antibacterial activity when tested alone. [57] Neither this corecoating synergistic effect nor any observation of bacteria inhibition is present when Au NPs are coated and stabilized with non-active capping ligands like citrate, [53] PVA, [58] or PEG [59] (polyethylene glycol). However, we have recently shown that Au III solutions are able to induce bacterial wall damage, being much more harmful against Gram-negative than Gram-positive bacteria.…”

Section: Bactericidal Activity Of Au@pom Nanoparticlesmentioning

confidence: 99%

Gold Nanoparticles Capped with a Novel Titanium(IV)‐Containing Polyoxomolybdate Cluster: Selective and Enhanced Bactericidal Effect Against Escherichia coli

Paesa,

Almazán,

Yus

et al. 2023

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Bacterial infections are a public health threat of increasing concern in medical care systems; hence, the search for novel strategies to lower the use of antibiotics and their harmful effects becomes imperative. Herein, the antimicrobial performance of four polyoxometalate (POM)‐stabilized gold nanoparticles (Au@POM) against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) as Gram‐negative and Gram‐positive bacteria models, respectively, is studied. The bactericidal studies performed, both in planktonic and sessile forms, evidence the antimicrobial potential of these hybrid nanostructures with selectivity toward Gram‐negative species. In particular, the Au@GeMoTi composite with the novel [Ti2(HGeMo7O28)2]10– POM capping ligand exhibits outstanding bactericidal efficiency with a minimum inhibitory concentration of just 3.12 µm for the E. coli strain, thus outperforming the other three Au@POM counterparts. GeMoTi represents the fourth example of a water‐soluble TiIV‐containing polyoxomolybdate, and among them, the first sandwich‐type structure having heteroatoms in high‐oxidation state. The evaluation of the bactericidal mechanisms of action points to the cell membrane hyperpolarization, disruption, and subsequent nucleotide leakage and the low cytotoxicity exerted on five different cell lines at antimicrobial doses demonstrates the antibiotic‐like character. These studies highlight the successful design and development of a new POM‐based nanomaterial able to eradicate Gram‐negative bacteria without damaging mammalian cells.

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Optical and Structural Properties of PVA Capped Gold Nanoparticles and Their Antibacterial Efficacy

Cited by 7 publications

References 37 publications

Cr(III) Ion-Imprinted Hydrogel Membrane for Chromium Speciation Analysis in Water Samples

Cr(III) Ion-Imprinted Hydrogel Membrane for Chromium Speciation Analysis in Water Samples

Highly Specific Peptide-Mediated Cuvette-Form Localized Surface Plasmon Resonance (LSPR)-Based Fipronil Detection in Egg

Gold Nanoparticles Capped with a Novel Titanium(IV)‐Containing Polyoxomolybdate Cluster: Selective and Enhanced Bactericidal Effect Against Escherichia coli

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