Gold nanoparticle-based nano-probe for the colorimetric sensing of Cr3+and Cr2O72−by the coordination strategy

Nanoscale ◽  
2017 ◽  
Vol 9 (48) ◽  
pp. 19139-19144 ◽  
Author(s):  
Jianjun Du ◽  
Haoying Ge ◽  
Quanyong Gu ◽  
Hong Du ◽  
Jiangli Fan ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Quantitative Determination ◽  
Gold Nanoparticle ◽  
Colorimetric Sensing ◽  
Coordination Strategy

The Eyedropper function in Microsoft PowerPoint was introduced into the gold nanoparticles-based colorimetric recognition of Cr3+and Cr2O72−, which makes the quantitative determination easier, more convenient and more accurate.

scholarly journals Application of Gold-Nanoparticle Colorimetric Sensing to Rapid Food Safety Screening

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4166 ◽  
Author(s):  
Guangyang Liu ◽  
Meng Lu ◽  
Xiaodong Huang ◽  
Tengfei Li ◽  
Donghui Xu
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Rapid Testing ◽  
Colorimetric Sensing ◽  
Preparation Methods ◽  
Particle Spacing ◽  
Advantages And Disadvantages ◽  
Site Monitoring ◽  
Biological Affinity ◽  
Food Quality And Safety

Due to their unique optical properties, narrow size distributions, and good biological affinity, gold nanoparticles have been widely applied in sensing analysis, catalytic, environmental monitoring, and disease therapy. The color of a gold nanoparticle solution and its maximum characteristic absorption wavelength will change with the particle size and inter-particle spacing. These properties are often used in the detection of hazardous chemicals, such as pesticide residues, heavy metals, banned additives, and biotoxins, in food. Because the gold nanoparticles-colorimetric sensing strategy is simple, quick, and sensitive, this method has extensive applications in real-time on-site monitoring and rapid testing of food quality and safety. Herein, we review the preparation methods, functional modification, photochemical properties, and applications of gold nanoparticle sensors in rapid testing. In addition, we elaborate on the colorimetric sensing mechanisms. Finally, we discuss the advantages and disadvantages of colorimetric sensors based on gold nanoparticles, and directions for future development.

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)...

Label-free colorimetric logic gates based on free gold nanoparticles and the coordination strategy between cytosine and silver ions

2016 ◽  
Vol 40 (6) ◽  
pp. 5516-5522 ◽  
Author(s):  
Yan Zhang ◽  
Meng Li ◽  
Haiyun Liu ◽  
Shenguang Ge ◽  
Jinghua Yu
Keyword(s):  
Gold Nanoparticles ◽  
Silver Ions ◽  
Logic Gates ◽  
Label Free ◽  
Colorimetric Sensing ◽  
Coordination Strategy ◽  
Free Gold

A colorimetric sensing strategy combined with logic gates was demonstrated by taking advantage of the dispersion and aggregation of gold nanoparticles.

scholarly journals Colorimetric sensing strategy for heparin assay based on PDDA-induced aggregation of gold nanoparticles

2019 ◽  
Vol 1 (2) ◽  
pp. 486-489 ◽  
Author(s):  
Xiaoyi Ma ◽  
Xinyue Kou ◽  
Yuanyuan Xu ◽  
Dawei Yang ◽  
Peng Miao
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Colorimetric Sensor ◽  
Colloidal System ◽  
Colorimetric Sensing ◽  
Aggregation Effect ◽  
System P ◽  
Highly Sensitive ◽  
Induced Aggregation

We have developed a highly sensitive colorimetric sensor for the detection of heparin based on its anti-aggregation effect of the PDDA–gold nanoparticle colloidal system.

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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