Reversible photoisomerization of azobenzene molecules on a single gold nanoparticle surface

2016 ◽  
Vol 52 (14) ◽  
pp. 2984-2987 ◽  
Author(s):  
Heng Song ◽  
Chao Jing ◽  
Wei Ma ◽  
Tao Xie ◽  
Yi-Tao Long
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Nanoparticle Surface

PRRS spectra of single gold nanoparticles show a reversible shift towards the photoswitchable reaction, which could be verified by DDA simulations.

Epoxidation of stilbene using supported gold nanoparticles: cumyl peroxyl radical activation at the gold nanoparticle surface

2014 ◽  
Vol 50 (18) ◽  
pp. 2289 ◽  
Author(s):  
Charles-Oneil L. Crites ◽  
Geniece L. Hallet-Tapley ◽  
María González-Béjar ◽  
J. C. Netto-Ferreira ◽  
Juan C. Scaiano
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Peroxyl Radical ◽  
Nanoparticle Surface ◽  
Supported Gold Nanoparticles ◽  
Supported Gold

Nucleobase assisted pyrene functionalization of gold nanoparticles

2021 ◽  
Author(s):  
M S S Vinod Mouli ◽  
Arpna Tamrakar ◽  
Mrituanjay D Pandey ◽  
Ashutosh Kumar Mishra
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Nanoparticle Surface ◽  
Photoluminescence Behavior

Herein, we report the functionalization of the gold nanoparticles with pyrene fluorophore via a connecting nucleobase spacer displaying the inherent photoluminescence behavior, without getting quenched by the gold nanoparticle surface...

scholarly journals Colorimetric Technique for Antimony Detection Based on the Use of Gold Nanoparticles Conjugated with Poly-A Oligonucleotide

2019 ◽  
Vol 9 (22) ◽  
pp. 4782
Author(s):  
Berlina ◽  
Komova ◽  
Zherdev ◽  
Gaur ◽  
Dzantiev
Keyword(s):  
Gold Nanoparticles ◽  
Drinking Water ◽  
Detection Limit ◽  
Gold Nanoparticle ◽  
Variation Coefficient ◽  
Sensitive Detection ◽  
Naked Eye ◽  
Nanoparticle Surface ◽  
Colorimetric Measurements ◽  
Target Analyte

A simple and rapid positive–negative colorimetric approach to determine the presence of antimony ions based on the use of gold nanoparticles conjugated with oligonucleotide (poly-A sequence) is developed. Colorimetric measurements reveal that the aggregates of modified gold nanoparticles were afforded after adding antimony ions, thus changing the solution color from pink to blue. The results of aptamer’s interaction on the gold nanoparticle surface with the target analyte can be detected either by photometry or by the naked eye. The realized assay provides rapid (2 min), sensitive (detection limit 10 ng/mL), specific, and precise (variation coefficient less than 3.8%) detection of antimony (III) in drinking water.

Single particle electrochemistry of p-hydroxythiophenol-labeled gold nanoparticles

RSC Advances ◽  
2015 ◽  
Vol 5 (61) ◽  
pp. 49031-49035 ◽  
Author(s):  
Jing Zhang ◽  
Yongfeng Wei ◽  
Lei Tian ◽  
Xiaofeng Kang
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Single Particle ◽  
Particle Collision ◽  
Nanoparticle Surface ◽  
Electrochemical Signal

Electroactive p-hydroxythiophenol (p-HTP) monolayer on a gold nanoparticle surface produced an amplified single particle-collision electrochemical signal.

scholarly journals Colorimetric Technique for Antimony Detection Based on the Use of Gold Nanoparticles Conjugated with Poly-A Oligonucleotide

2019 ◽  
Author(s):  
Anna N. Berlina ◽  
Nadezhda S. Komova ◽  
Anatoly V. Zherdev ◽  
Mulayam S. Gaur ◽  
Boris B. Dzantiev
Keyword(s):  
Gold Nanoparticles ◽  
Drinking Water ◽  
Detection Limit ◽  
Gold Nanoparticle ◽  
Variation Coefficient ◽  
Sensitive Detection ◽  
Naked Eye ◽  
Nanoparticle Surface ◽  
Colorimetric Measurements ◽  
Target Analyte

A simple and rapid positive–negative colorimetric approach to determine the presence of antimony ions based on the use of gold nanoparticles conjugated with oligonucleotide (poly-A sequence) is developed. Colorimetric measurements reveal that the aggregates of modified gold nanoparticles were afforded after adding antimony ions, thus changing the solution color from pink to blue. The results of aptamer’s interaction on the gold nanoparticle surface with target analyte can be detected either by photometry or by the naked eye. The realized assay provides rapid (2 min), sensitive (detection limit 10 ng/mL), specific, and precise (variation coefficient less than 3.8%) detection of antimony (III) in drinking water

A protein corona study by scattering correlation spectroscopy: a comparative study between spherical and urchin-shaped gold nanoparticles

Nanoscale ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 3665-3673 ◽  
Author(s):  
Hanane Moustaoui ◽  
Justine Saber ◽  
Ines Djeddi ◽  
Qiqian Liu ◽  
Dania Movia ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Comparative Study ◽  
Gold Nanoparticle ◽  
Binding Affinity ◽  
Protein Corona ◽  
Correlation Spectroscopy ◽  
Protein Orientation ◽  
Nanoparticle Surface

Gold nanoparticle interaction with proteins is characterized by using scattering correlation spectroscopy. Protein orientation and binding affinity regarding the nanoparticle surface are discussed.

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.

scholarly journals CRISPR/Cas12a-mediated gold nanoparticle aggregation for colorimetric detection of SARS-CoV-2

2021 ◽  
Author(s):  
Yiren Cao ◽  
Jinjun Wu ◽  
Bo Pang ◽  
Hongquan Zhang ◽  
X. Chris Le
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Colorimetric Detection ◽  
Isothermal Amplification ◽  
Nanoparticle Aggregation ◽  
Cleavage Activity ◽  
Gold Nanoparticle Aggregation

The trans-cleavage activity of the target-activated CRISPR-Cas12a liberated an RNA crosslinker from a molecular transducer, which facilitated assembly of gold nanoparticles. Integration of the molecular transducer with isothermal amplification and...

Fluorescence biosensor for Salmonella typhimurium detection in food based on nano-self-assembly of alendronic acid modified upconversion and gold nanoparticles

2021 ◽  
Author(s):  
Min Chen ◽  
Leiqing Pan ◽  
K. Tu
Keyword(s):  
Gold Nanoparticles ◽  
Salmonella Typhimurium ◽  
Gold Nanoparticle ◽  
Alendronic Acid ◽  
Self Assembly ◽  
Upconversion Nanoparticles ◽  
Fluorescent Biosensor ◽  
Fluorescence Biosensor

A simple and quick responsive fluorescent biosensor for Salmonella typhimurium detection based on the recognition of aptamer coupled with alendronic acid (ADA)@upconversion nanoparticles (UCNPs) and gold nanoparticle (AuNPs) has been...

scholarly journals Enhanced Extracellular Synthesis of Gold Nanoparticles by Soluble Extracts from Escherichia coli Transformed with Rhizobium tropici Phytochelatin Synthase Gene

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 472
Author(s):  
Qunying Yuan ◽  
Manjula Bomma ◽  
Zhigang Xiao
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Synthesis Method ◽  
Nanoparticle Synthesis ◽  
Morphological Properties ◽  
Phytochelatin Synthase ◽  
Rhizobium Tropici ◽  
Whole Cells ◽  
E Coli ◽  
Recombinant Cells

Phytochelatins, the enzymatic products of phytochelatin synthase, play a principal role in protecting the plants from heavy metal and metalloid toxicity due to their ability to scavenge metal ions. In the present study, we investigated the capacity of soluble intracellular extracts from E. coli cells expressing R. tropici phytochelatin synthase to synthesize gold nanoparticle. We discovered that the reaction mediated by soluble extracts from the recombinant E. coli cells had a higher yield of gold nanoparticles, compared to that from the control cells. The compositional and morphological properties of the gold nanoparticles synthesized by the intracellular extracts from recombinant cells and control cells were similar. In addition, this extracellular nanoparticle synthesis method produced purer gold nanoparticles, avoiding the isolation of nanoparticles from cellular debris when whole cells are used to synthesize nanoparticles. Our results suggested that phytochelatins can improve the efficiency of gold nanoparticle synthesis mediated by bacterial soluble intracellular extracts, and the potential of extracellular nanoparticle synthesis platform for the production of nanoparticles in large quantity and pure form is worth further investigation.

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