scholarly journals Highly sensitive colorimetric sensing of copper(ii) ions based on “CLICK-17” DNAzyme-catalyzed azide modified gold nanoparticles and alkyne capped dsDNA cycloaddition

RSC Advances ◽  
2021 ◽  
Vol 11 (39) ◽  
pp. 24196-24205
Author(s):  
Weicong Yan ◽  
Zhensheng Zhong ◽  
Jie Ma ◽  
Thitima Rujiralai
Keyword(s):  
Gold Nanoparticles ◽  
Visual Detection ◽  
Click Reaction ◽  
Colorimetric Sensing ◽  
Highly Sensitive

We report selective and visual detection of Cu2+ based on aggregation of azide modified gold nanoparticles induced by CLICK-17 DNAzyme and Cu2+ or Cu+ catalyzed click reaction between azide-AuNPs and alkyne-dsDNA.

Highly sensitive and rapid visual detection of ricin using unmodified gold nanoparticle probes

RSC Advances ◽  
2014 ◽  
Vol 4 (83) ◽  
pp. 43998-44003 ◽  
Author(s):  
Jingting Hu ◽  
Haichao Dai ◽  
Yujing Sun ◽  
Pengjuan Ni ◽  
Yilin Wang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Visual Detection ◽  
Nanoparticle Probes ◽  
Highly Sensitive

A sensitive aptamer-based colorimetric biosensor for the detection of ricin using unmodified gold nanoparticles as probe was developed.

Rapid and sensitive colorimetric sensing of the insecticide pymetrozine using melamine-modified gold nanoparticles

2018 ◽  
Vol 10 (4) ◽  
pp. 417-421 ◽  
Author(s):  
Jing-yan Kang ◽  
Yu-jie Zhang ◽  
Xing Li ◽  
Chen Dong ◽  
Hong-yu Liu ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Natural Water ◽  
Visual Detection ◽  
Detection Limits ◽  
High Sensitivity ◽  
Food Samples ◽  
Colorimetric Sensing ◽  
Au Nps

A rapid, selective, visual detection sensor with high sensitivity and low detection limits for the pesticide pymetrozine (PYM) was prepared from melamine-modified gold nanoparticles (M-Au NPs), and shown to be effective in both natural water and food samples.

scholarly journals Mercaptosuccinic-Acid-Functionalized Gold Nanoparticles for Highly Sensitive Colorimetric Sensing of Fe(III) Ions

Chemosensors ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 290
Author(s):  
Nadezhda S. Komova ◽  
Kseniya V. Serebrennikova ◽  
Anna N. Berlina ◽  
Svetlana M. Pridvorova ◽  
Anatoly V. Zherdev ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Drinking Water ◽  
Detection Limit ◽  
Analytical Signal ◽  
Colorimetric Sensor ◽  
World Health ◽  
Colorimetric Sensing ◽  
Functionalized Gold Nanoparticles ◽  
Mercaptosuccinic Acid ◽  
Highly Sensitive

The development of reliable and highly sensitive methods for heavy metal detection is a critical task for protecting the environment and human health. In this study, a qualitative colorimetric sensor that used mercaptosuccinic-acid-functionalized gold nanoparticles (MSA-AuNPs) to detect trace amounts of Fe(III) ions was developed. MSA-AuNPs were prepared using a one-step reaction, where mercaptosuccinic acid (MSA) was used for both stabilization, which was provided by the presence of two carboxyl groups, and functionalization of the gold nanoparticle (AuNP) surface. The chelating properties of MSA in the presence of Fe(III) ions and the concentration-dependent aggregation of AuNPs showed the effectiveness of MSA-AuNPs as a sensing probe with the use of an absorbance ratio of A530/A650 as an analytical signal in the developed qualitative assay. Furthermore, the obvious Fe(III)-dependent change in the color of the MSA-AuNP solution from red to gray-blue made it possible to visually assess the metal content in a concentration above the detection limit with an assay time of less than 1 min. The detection limit that was achieved (23 ng/mL) using the proposed colorimetric sensor is more than 10 times lower than the maximum allowable concentration for drinking water defined by the World Health Organization (WHO). The MSA-AuNPs were successfully applied for Fe(III) determination in tap, spring, and drinking water, with a recovery range from 89.6 to 126%. Thus, the practicality of the MSA-AuNP-based sensor and its potential for detecting Fe(III) in real water samples were confirmed by the rapidity of testing and its high sensitivity and selectivity in the presence of competing metal ions.

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.

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