Gold nanoparticles functionalized with 2,6-dimercaptopurine for sensitive and selective colorimetric determination of cadmium(ii) in food, biological and environmental samples

2017 ◽  
Vol 9 (38) ◽  
pp. 5598-5603 ◽  
Author(s):  
M. H. Hu ◽  
W. H. Huang ◽  
L. L. Suo ◽  
L. H. Zhou ◽  
L. F. Ma ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Environmental Samples ◽  
Color Change ◽  
Colorimetric Determination ◽  
Biological And Environmental Samples

The proposed method can recognize Cd2+in different samples based on the aggregation of DMP-AuNPs, resulting in a color change.

scholarly journals Hydrogen-Bonding Recognition-Induced Colorimetric Determination of Hydrazine Based on the Tryptophan Capped Gold Nanoparticles

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Wenhua Gao ◽  
Jing Xi ◽  
Yunsheng Chen ◽  
Song Xiao ◽  
Xingqing Wang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Color Change ◽  
Detection System ◽  
Colorimetric Method ◽  
Cost Effective ◽  
Colorimetric Determination ◽  
Chloroauric Acid ◽  
Sample Analysis ◽  
Higher Temperature

A simple, cost-effective, and rapid colorimetric method for hydrazine detection using tryptophan-caped gold nanoparticles (Trp-AuNPs) has been developed. Tryptophan (Trp) is a protein with reducibility and amino group which can reduce chloroauric acid (HAuCl4) to AuNPs and modify the surface of AuNPs simultaneously. The Trp-AuNPs could be used to quantitatively detect hydrazine and showed different responses to vary concentration of hydrazine in an aqueous solution based on the aggregation-induced color change of Trp-AuNPs. The real water sample analysis verified the conclusion. The sensitivity of the detection system was influenced by the size of AuNPs which is determined by the pH of the detection system, the concentration of Trp, and the react time. We found that higher temperature contributed to more rapidly results. The detection system can detect as low as 1 μM hydrazine. We expect our approach to have wide-ranging applications in the developing region for monitoring water quality in some areas.

Ratiometric colorimetric determination of coenzyme A using gold nanoparticles and a binuclear uranyl complex as optical probes

2015 ◽  
Vol 183 (2) ◽  
pp. 715-721 ◽  
Author(s):  
Rurong Wu ◽  
Lifu Liao ◽  
Shijun Li ◽  
Yanyan Yang ◽  
Xilin Xiao ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Coenzyme A ◽  
Uranyl Complex ◽  
Colorimetric Determination ◽  
Optical Probes
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