scholarly journals Sinter-resistant gold nanoparticles encapsulated by zeolite nanoshell for oxidation of cyclohexane

RSC Advances ◽  
2016 ◽  
Vol 6 (10) ◽  
pp. 8015-8020 ◽  
Author(s):  
Shilpi Saxena ◽  
Rupesh Singh ◽  
Raj Ganesh S. Pala ◽  
Sri Sivakumar
Keyword(s):  
Gold Nanoparticles ◽  
Hydrothermal Synthesis ◽  
Gold Nanoparticle ◽  
Au Nanoparticles ◽  
Cyclohexane Oxidation

We report hydrothermal synthesis of sinter-resistant gold nanoparticle encapsulated by zeolite shells, which serve the role of stabilizing Au nanoparticles against sintering during cyclohexane oxidation.

Selective Colorimetric Sensing of Deferoxamine with 4-Mercaptophenol− and Mercaptoacetic acid−Functionalized Gold Nanoparticles via Fe(III)-Chelation

2021 ◽  
Author(s):  
Ömer Kaan Koç ◽  
Elif Ezgi Benli ◽  
Nurşah Karahan ◽  
Ayşem Üzer Arda ◽  
Resat Apak
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Au Nanoparticles ◽  
Mercaptoacetic Acid ◽  
Colorimetric Sensing ◽  
Colorimetric Probe ◽  
Functionalized Gold Nanoparticles

A gold nanoparticle-based colorimetric probe was developed for the determination of deferoxamine (desferrioxamine, DFO), a strong Fe(III) ion-chelator. Au-nanoparticles were synthesized and modified with 4-mercaptophenol (4MP) and mercaptoacetic acid (MAA)...

Radioactive Gold Nanoparticle in Two Forms (19879Au GNPs and 99mTc-GNPs) for Lung Cancer Antiproliferative Induction and Intralesional Imaging: A Proof of Concept

2020 ◽  
Vol 20 (14) ◽  
pp. 1648-1653 ◽  
Author(s):  
Hongwei Xu ◽  
Shengpan Jiang ◽  
Jimin Wang ◽  
Xuebing Li ◽  
Tingwei Wu ◽  
...  
Keyword(s):  
Lung Cancer ◽  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Au Nanoparticles ◽  
A549 Cells ◽  
Intralesional Injection ◽  
Proof Of Concept ◽  
Efficient Treatment

Background: Lung cancer is among the most common cancers worldwide, responsible for 13% of all new cancer cases. Also, it is the leading cause of cancer death among both men and women. In this scenario, an effective and efficient treatment is required. Objective: Production of two gold nanoparticles: 198Au and 99mTc-Au. The first one has been produced from irradiation of the 197Au in order to produce a beta-emitter gold nanoparticle for cancer therapy. The second one has been produced from the radiolabeling of gold nanoparticles with technetium 99 metastable in order to produce imaging nanoagent. Methods: The 198Au nanoparticles were produced by irradiation and identified by hyper-purity germanium (HPGe). They were then evaluated in vitro in order to confirm the behavior on cell proliferation of lung cancer cell lines by the MTT methodology using A549 cells. The 99mTc-Au nanoparticles were produced by directradiolabeling with 99mTc and evaluated in vivo as intralesional nanoagent. Results: The results showed that in both cases, all the nanoparticles have performed their duties with excellence. The 198Au nanoparticles were capable to kill lung cancer cells, while 99mTc-Au was capable to image the tumor after intralesional injection. In addition, 99mTc-Au nanoparticles were useful for biodistribution assay imaging, showing the main organs responsible for the nanoparticle uptake in healthy animals. Conclusion: Both gold nanoparticles showed to be a highly efficient nanoagent for both: therapy and diagnosing of lung cancer.

On the role of gold nanoparticles in the selective photooxidation of 2-propanol over Au/TiO2

2015 ◽  
Vol 17 (16) ◽  
pp. 10391-10397 ◽  
Author(s):  
Alexander Lüken ◽  
Martin Muhler ◽  
Jennifer Strunk
Keyword(s):  
Gold Nanoparticles ◽  
Electron Transfer ◽  
Reaction Mechanism ◽  
Conduction Band ◽  
Electron Acceptor ◽  
Au Nanoparticles ◽  
Hole Capture ◽  
Insight Into

Partial insight into the reaction mechanism of the photooxidation of 2-propanol over Au/TiO2. 2-Propanol is activated by hole capture and converted to acetone requiring the presence of O2 as an electron acceptor. The deposited Au nanoparticles are assumed to facilitate the electron transfer from the TiO2 conduction band to adsorbed O2.

scholarly journals Easy colorimetric detection of gadolinium ions based on gold nanoparticles: key role of phosphine-sulfonate ligands

2020 ◽  
Vol 2 (10) ◽  
pp. 4671-4681
Author(s):  
Marjorie Yon ◽  
Claire Pibourret ◽  
Jean-Daniel Marty ◽  
Diana Ciuculescu-Pradines
Keyword(s):  
Gold Nanoparticles ◽  
Au Nanoparticles ◽  
Colorimetric Detection ◽  
Specific Interactions

Specific interactions between sulfonate groups of phosphine-sulfonate ligands on the surface of Au nanoparticles and Gd3+ ions allow the colorimetric detection of Gd3+ ions at the μM level.

scholarly journals Innovative gold nanoparticle patterning and selective metallization

2013 ◽  
Vol 1547 ◽  
pp. 149-154
Author(s):  
E.S. Kooij ◽  
M.A. Raza ◽  
H.J.W. Zandvliet
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Pure Water ◽  
Water Molecules ◽  
Thiol Groups ◽  
Seeded Growth ◽  
Self Assembled Layer ◽  
High Degree ◽  
Metal Layers

ABSTRACTWe present a simple, novel procedure to selectively deposit gold nanoparticles using pure water. It enables patterning of nanoparticle monolayers with a remarkably high degree of selectivity on flat as well as microstructured oxide surfaces. We demonstrate that water molecules form a thin ‘capping’ layer on exposed thiol molecules within the mercaptan self-assembled layer. This reversible capping of water molecules locally ‘deactivates’ the thiol groups, therewith inhibiting the binding of metallic gold nanoparticles to these specific areas. In addition, we show that this amazing role of water molecules can be used to selectively metalize the patterned gold nanoparticle arrays. Employing an electroless seeded growth process, the isolated seeds are enlarged past the percolation threshold to deposit conducting metal layers.

scholarly journals Hydrothermal synthesis of gold nanoparticles and metal organic framework hybrid structure

2019 ◽  
Vol 2 (2) ◽  
pp. 95-101
Author(s):  
Hien Thi Thu Nguyen ◽  
Hai Thi Le ◽  
Trang Thi Minh Nguyen ◽  
Hien Minh Nguyen ◽  
Thi Tan Pham
Keyword(s):  
Gold Nanoparticles ◽  
Hydrothermal Synthesis ◽  
Diffuse Reflectance ◽  
Au Nanoparticles ◽  
Metal Organic Framework ◽  
Hybrid Structure ◽  
Vis Spectroscopy ◽  
Metal Organic ◽  
Transmission Microscope ◽  
Organic Framework

We report a hydrothermal synthesis of a hybrid structure between gold nanoparticles and a metal organic framework, ZIF-8 (abbreviated as Au@ZIF-8). Au nanoparticles encapsulated in polyvinylpyrrolidone (PVP) was employed as seeds to grow the framework of ZIF-8. We controlled the position and concentrations of Au nanoparticles on ZIF-8 crystal by adjusting the volume of Au nanoparticles dissolved in DI water during the growth of ZIF-8. Morphology, structure, distribution of the hybrid structure were investigated by transmission microscope, powder xray diffraction, and diffuse reflectance UV-Vis spectroscopy. We tested out catalytic properties of Au@ZIF-8 through the reaction of 2-nitrophenol and NaBH4.

scholarly journals Near-Infrared-Responsive Cancer Photothermal and Photodynamic Therapy Using Gold Nanoparticles

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 961 ◽  
Author(s):  
Hyung Kim ◽  
Dong Lee
Keyword(s):  
Gold Nanoparticles ◽  
Cancer Therapy ◽  
Gold Nanoparticle ◽  
Near Infrared ◽  
Energy Conversion Efficiency ◽  
Biological Properties ◽  
Drug Delivery Carrier ◽  
Thermal Energy Conversion ◽  
Gold Nanocomposites

Rapid growth of nanotechnology is one of the most quickly emerging tendencies in cancer therapy. Gold nanoparticles roused a distinctive interest in the field, due to their incomparable light-to-thermal energy conversion efficiency, and their ability to load and deliver a variety of anticancer drugs. Therefore, simultaneous photothermal (PTT) and photodynamic (PDT) cancer therapy is available by the role of the thermal agent of the gold nanoparticle itself and the drug delivery carrier for photosensitizer (PS) transport. In this review, the physical, chemical, and biological properties of gold nanoparticle, which can promote PTT and PDT efficiency, are briefly demonstrated, and we highlight recent progression in the development of PS-containing gold nanocomposites for effective cancer therapy.

scholarly journals The role of pre-nucleation clusters in the crystallization of gold nanoparticles

Nanoscale ◽  
2020 ◽  
Vol 12 (30) ◽  
pp. 16173-16188 ◽  
Author(s):  
Raj Kumar Ramamoorthy ◽  
Ezgi Yildirim ◽  
Enguerrand Barba ◽  
Pierre Roblin ◽  
Jorge A. Vargas ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Nucleation Mechanism ◽  
Nucleation Stage

The gold nanoparticle nucleation stage identified by XAS is accompanied in SAXS by an abrupt shrinkage of the size of molecular pre-nucleation clusters into gold nuclei, which is interpreted as a non-classical nucleation mechanism.

Interference of Gold Nanoparticles with In vitro Endotoxin Detection Assays

2020 ◽  
Vol 16 (2) ◽  
pp. 204-213 ◽  
Author(s):  
Melissa A. Vetten ◽  
Mary Gulumian
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Surface Reactivity ◽  
In Vitro Assays ◽  
Limulus Amebocyte Lysate ◽  
Chromogenic Assay ◽  
Nanoparticle Suspensions ◽  
Endotoxin Contamination ◽  
Factor C

Background: Endotoxin-free engineered nanoparticle suspensions are imperative for their successful applications in the field of nanomedicine as well as in the investigations in their toxicity. Gold nanoparticles are known to interfere with various in vitro assays due to their optical properties and potential for surface reactivity. In vitro endotoxin testing assays are known to be susceptible to interference caused by the sample being tested. Objective: This study aimed to identify a preferred assay for the testing of endotoxin contamination in gold nanoparticle suspensions. Methods: The interference by gold nanoparticles on three assays namely, the commonly used limulus amebocyte lysate chromogenic assay, the limulus amebocyte lysate gel-clot method, and the less common recombinant Factor C (rFC) assay, was tested. Results: Possible interference could be observed with all three assays. The interference with the absorbance- based chromogenic assay could not be overcome by dilution; whilst the qualitative nature of the gel-clot assay excluded the possibility of distinguishing between a false positive result due to enhancement of the sensitivity of the assay, and genuine endotoxin contamination. However, interference with the rFC assay was easily overcome through dilution. Conclusion: The rFC assay is recommended as an option for endotoxin contamination detection in gold nanoparticle suspensions.

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