Ecotoxicity of ∼1 nm silver and palladium nanoclusters protected by l -glutathione on the microbial growth under light and dark conditions

Farrag, Mostafa; Mohamed, R. A.

doi:10.1016/j.jphotochem.2016.07.027

Cited by 24 publications

(15 citation statements)

References 42 publications

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“…Strong peaks at 2919 and −1709 cm –1 for C–H and CN stretchings, respectively, confirm the functionalization of nanoparticles with LA . On the other hand, peaks at 1401, 1674, and 1591 cm –1 for O–H and CO stretching and N–H bending, respectively, confirm the chemisorption of GSH on CCAu nanoparticles. , …”

Section: Resultsmentioning

confidence: 77%

“…34 On the other hand, peaks at 1401, 1674, and 1591 cm −1 for O−H and CO stretching and N− H bending, respectively, confirm the chemisorption of GSH on CCAu nanoparticles. 35,36 Energy-dispersive X-ray spectra of CCAu nanoparticles confirmed the presence of only Au in the nanoparticles (Figure S5a). However, the spectra of CCAu nanoparticles functionalized with LA (i.e., CCAuLA) and GSH (i.e., CCAuGSH) have a significant sulfur peak because both LA and GSH are sulfur-containing compounds (Figure S5b,c).…”

Section: ■ Results and Discussionmentioning

confidence: 85%

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Functionalized Concave Cube Gold Nanoparticles as Potent Antimicrobial Agents against Pathogenic Bacteria

Sarker

Polash

Karim

et al. 2022

ACS Appl. Bio Mater.

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Gold (Au) is an inert metal in a bulk state; however, it can be used for the preparation of Au nanoparticles (i.e., AuNPs) for multidimensional applications in the field of nanomedicine and nanobiotechnology. Herein, monodisperse concave cube AuNPs (CCAuNPs) were synthesized and functionalized with a natural antioxidant lipoic acid (LA) and a tripeptide glutathione (GSH) because different crystal facets of AuNPs provide binding sites for distinct ligands. There was an ∼10 nm bathochromic shift of the UV–vis spectrum when CCAuNPs were functionalized with LA, and the size of the as-synthesized monodisperse CCAu nanoparticles was 76 nm. The LA-functionalized CCAu nanoparticles (i.e., CCAuLA) showed the highest antibacterial activity against Bacillus subtilis. Both fluorescence images and scanning electron microscopy images confirm the damage of the bacterial cell wall as the mode of antibacterial activity of CCAuNPs. CCAuNPs also cause the oxidation of bacterial cell membrane fatty acids to produce reactive oxygen species, which pave the way for the death of bacteria. Both CCAu nanoparticles and their functionalized derivatives showed excellent hemocompatibility (i.e., percentage of hemolysis is <5% at 80 μg of AuNPs) to human red blood cells and very high biocompatibility to HeLa, L929, and Chinese hamster ovary-green fluorescent protein (CHO-GFP) cells. Taken together, LA and GSH enhance the antibacterial activity and biocompatibility, respectively, of CCAu nanoparticles that interact with the bacteria through Coulomb as well as hydrophobic interactions before demonstrating antibacterial propensity.

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Section: Resultsmentioning

confidence: 77%

Section: ■ Results and Discussionmentioning

confidence: 85%

Functionalized Concave Cube Gold Nanoparticles as Potent Antimicrobial Agents against Pathogenic Bacteria

Sarker

Polash

Karim

et al. 2022

ACS Appl. Bio Mater.

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“…The characteristic thiol moiety from LG is observed by the S−H stretching vibration at 2522 cm −1 , which also confirms the availability of this group for the As(V) uptake. 26,27,38,39 Signals at 1711, 1658, 1600, and 1395 cm −1 are attributed to the CO of the carboxylic acid (−COOH) and the asymmetrical and symmetrical stretching vibrations of the carboxylate group (−COO − ) of the glycine and glutamic residues in the LG, respectively. Amine groups are also corroborated by the N−H bending mode at 1540 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

Novel Silica Hybrid Adsorbent Functionalized with l-Glutathione Used for the Uptake of As(V) from Aqueous Media

Rodríguez-de-la-Peña

Gómez-Salazar

Gutiérrez-Ortega

et al. 2022

Ind. Eng. Chem. Res.

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A hybrid silica mesoporous material with l-glutathione (LG) (SG-LGPS) was synthesized by a modified sol–gel process. The chemical and structural characterization of the SG-LGPS material was achieved by Fourier transform infrared, solid-state 13C and 19Si NMR, and X-ray diffraction. Surface analysis showed a specific surface area of 466.8 m2 g–1. X-ray photoelectron spectroscopy and energy dispersive X-ray spectrometry measurements demonstrated the chemical composition of the hybrid material and the presence of As(V) after the uptake process. The adsorption performance for SG-LGPS reached a maximum arsenic uptake of 45.22 mg g–1 at pH = 4; kinetics and equilibrium results were better described by the pseudo-second-order and Temkin models, respectively. Competitive ion adsorption studies were also performed. The uptake mechanism proposed for this material is a bidentate arsenic–glutathione complex. The present material proposed is as follows: (1) a new scope for environmentally friendly materials with amino acids and (2) a versatile adsorption application extended to other heavy metal ions due to the LG functional group composition.

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“…This model of catalysis is very complicated and largely deviated from the real world of catalytic conditions. Monolayer-protected nanoclusters of noble metals have recently gained much attention in the catalysis field due to their unique atomic packing structure and electronic properties 26 – 38 . In our previous work, platinum nanoclusters protected with l-cysteine and N-acetyl-l-cysteine over TiO 2 showed high catalytic activity in the oxidation of styrene 26 and solar degradation of methylene blue 38 , respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Monolayer-protected nanoclusters of noble metals have recently gained much attention in the catalysis field due to their unique atomic packing structure and electronic properties 26 – 38 . In our previous work, platinum nanoclusters protected with l-cysteine and N-acetyl-l-cysteine over TiO 2 showed high catalytic activity in the oxidation of styrene 26 and solar degradation of methylene blue 38 , respectively. Pd nanoclusters protected with N-acetyl-l-cysteine exhibited superior catalytic activity in hydrogenation of α, β-unsaturated aldehydes such as cinnamaldehyde 33 .…”

Section: Introductionmentioning

confidence: 99%

Hydrogen generation of single alloy Pd/Pt quantum dots over Co3O4 nanoparticles via the hydrolysis of sodium borohydride at room temperature

Farrag

Ali

2022

Sci Rep

Self Cite

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To satisfy global energy demands and decrease the level of atmospheric greenhouse gases, alternative clean energy sources are required. Hydrogen is one of the most promising clean energy sources due to its high chemical energy density and near-zero greenhouse gas emissions. A single alloyed phase of Pd/Pt nanoclusters as quantum dots (QDs) was prepared and loaded over Co3O4 nanoparticles with a low loading percentage (1 wt.%) for hydrogen generation from the hydrolysis of NaBH4 at room temperature. L-glutathione (SG) was used as a capping ligand. It was found that the single alloy catalyst (Pd0.5–Pt0.5)n(SG)m/Co3O4 caused a significant enhancement in hydrogen generation in comparison to the monometallic clusters (Pdn(SG)m and Ptn(SG)m). Moreover, the Pd/Pt alloy showed a positive synergistic effect compared to the physical mixture of Pd and Pt clusters (1:1) over Co3O4. The QDs alloy and monometallic Pd and Pt clusters exhibited well-dispersed particle size in ~ 1 nm. The (Pd0.5–Pt0.5)n(SG)m)/Co3O4 catalyst offers a high hydrogen generation rate (HGR) of 8333 mL min− 1 g− 1 at room temperature. The synergistic effect of Pd and Pt atoms in the nanoclusters alloy is the key point beyond this high activity, plus the prepared clusters' unique atomic packing structure and electronic properties. The effect of the NaBH4 concentration, catalyst amount, and reaction temperature (25–60 °C) were investigated, where HGR reaches 50 L min− 1 g− 1 at 60 °C under the same reaction conditions. The prepared catalysts were analyzed by UV–Vis, TGA, HR-TEM, XRD, and N2 adsorption/desorption techniques. The charge state of the Pd and Pt in monometallic and alloy nanoclusters is zero, as confirmed by X-ray photoelectron spectroscopy analysis. The catalysts showed high recyclability efficiency for at least five cycles due to the high leaching resistance of the alloy nanoclusters within the Co3O4 host. The prepared catalysts are highly efficient for energy-based applications.

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Ecotoxicity of ∼1 nm silver and palladium nanoclusters protected by l -glutathione on the microbial growth under light and dark conditions

Cited by 24 publications

References 42 publications

Functionalized Concave Cube Gold Nanoparticles as Potent Antimicrobial Agents against Pathogenic Bacteria

Functionalized Concave Cube Gold Nanoparticles as Potent Antimicrobial Agents against Pathogenic Bacteria

Novel Silica Hybrid Adsorbent Functionalized with l-Glutathione Used for the Uptake of As(V) from Aqueous Media

Hydrogen generation of single alloy Pd/Pt quantum dots over Co3O4 nanoparticles via the hydrolysis of sodium borohydride at room temperature

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