Colorimetric detection of quaternary ammonium surfactants using citrate-stabilized gold nanoparticles (Au NPs)

2014 ◽  
Vol 6 (7) ◽  
pp. 2031-2033 ◽  
Author(s):  
Li-Qing Zheng ◽  
Xiao-Dong Yu ◽  
Jing-Juan Xu ◽  
Hong-Yuan Chen
Keyword(s):  
Gold Nanoparticles ◽  
Quaternary Ammonium ◽  
Low Cost ◽  
Colorimetric Detection ◽  
Hydrophobic Effect ◽  
Colorimetric Method ◽  
Au Nps ◽  
Quaternary Ammonium Surfactants

Based on the hydrophobic effect inducing the aggregation of Au NPs, a rapid and low-cost colorimetric method for detection of quaternary ammonium surfactants using citrate-stabilized AuNPs was developed.

Colorimetric detection of Cs+ based on the nonmorphological transition mechanism of gold nanoparticles in the presence of Prussian blue

2020 ◽  
Vol 44 (6) ◽  
pp. 2241-2246
Author(s):  
Jiaoyan Qiu ◽  
Ling Fu ◽  
Hongsen Wang ◽  
Ruifen Zou ◽  
Yujie Zhang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Prussian Blue ◽  
Colorimetric Detection ◽  
Colorimetric Method ◽  
Au Nps ◽  
Transition Mechanism

A colorimetric method for the detection of Cs+ using Au NPs and Prussian blue based on a nonmorphological transition mechanism.

scholarly journals Highly Sensitive and Selective Colorimetric Detection of Methylmercury Based on DNA Functionalized Gold Nanoparticles

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2679 ◽  
Author(s):  
Zheng-Jun Xie ◽  
Xian-Yu Bao ◽  
Chi-Fang Peng
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Limit Of Detection ◽  
Low Cost ◽  
Colorimetric Detection ◽  
Colorimetric Method ◽  
Optimal Conditions ◽  
Surface Deposition ◽  
Highly Sensitive ◽  
Dna Strand

A new colorimetric detection of methylmercury (CH3Hg+) was developed, which was based on the surface deposition of Hg enhancing the catalytic activity of gold nanoparticles (AuNPs). The AuNPs were functionalized with a specific DNA strand (HT7) recognizing CH3Hg+, which was used to capture and separate CH3Hg+ by centrifugation. It was found that the CH3Hg+ reduction resulted in the deposition of Hg onto the surface of AuNPs. As a result, the catalytic activity of the AuNPs toward the chromogenic reaction of 3,3,5,5-tetramethylbenzidine (TMB)-H2O2 was remarkably enhanced. Under optimal conditions, a limit of detection of 5.0 nM was obtained for CH3Hg+ with a linear range of 10–200 nM. We demonstrated that the colorimetric method was fairly simple with a low cost and can be conveniently applied to CH3Hg+ detection in environmental samples.

Ultrasensitive colorimetric detection of Hg2+ ions based on enhanced catalytic performance of gold amalgam dispersed in channels of rose petals

The Analyst ◽  
2019 ◽  
Vol 144 (4) ◽  
pp. 1205-1209 ◽  
Author(s):  
Chi Zhang ◽  
Caiyun Kong ◽  
Qingyun Liu ◽  
Zhengbo Chen
Keyword(s):  
Gold Nanoparticles ◽  
Pore Structure ◽  
Low Cost ◽  
Colorimetric Detection ◽  
Catalytic Performance ◽  
Mercury Ions ◽  
Colorimetric Sensing ◽  
Rose Petals

We herein present a simple, low-cost, and ultrasensitive colorimetric sensing strategy for the detection of mercury ions (Hg2+) that takes advantage of the natural pore structure in rose petals to encapsulate gold nanoparticles (AuNPs).

A novel and environmentally friendly colorimetric method for detection of cystine in human urine using unmodified gold nanoparticles

RSC Advances ◽  
2014 ◽  
Vol 4 (52) ◽  
pp. 27297-27300 ◽  
Author(s):  
Li-Qiang Lu ◽  
Qian Gao ◽  
Chi Song ◽  
Xi-Ke Tian ◽  
An-Wu Xu
Keyword(s):  
Gold Nanoparticles ◽  
Human Urine ◽  
Colorimetric Detection ◽  
Colorimetric Method ◽  
Environmentally Friendly

A novel and environmentally friendly strategy based on unmodified AuNPs was developed for the colorimetric detection of cystine in human urine.

Simultaneous colorimetric detection of four drugs in their pharmaceutical formulations using unmodified gold nanoparticles as a probe

RSC Advances ◽  
2015 ◽  
Vol 5 (26) ◽  
pp. 19924-19932 ◽  
Author(s):  
Karuna A. Rawat ◽  
Hirakendu Basu ◽  
Rakesh Kumar Singhal ◽  
Suresh Kumar Kailasa
Keyword(s):  
Gold Nanoparticles ◽  
Colorimetric Detection ◽  
Pharmaceutical Formulations ◽  
Schematic Representation ◽  
Au Nps

Schematic representation for the aggregation of unmodified Au NPs induced by four drugs (venlafaxine, imipramine, amlodipine, and alfuzosin).

In situ colorimetric detection of glyphosate on plant tissues using cysteamine-modified gold nanoparticles

The Analyst ◽  
2019 ◽  
Vol 144 (6) ◽  
pp. 2017-2025 ◽  
Author(s):  
Qin Tu ◽  
Tianxi Yang ◽  
Yanqi Qu ◽  
Siyue Gao ◽  
Zhiyun Zhang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Colorimetric Detection ◽  
Colorimetric Method ◽  
Plant Tissues

A simple, rapid and fieldable colorimetric method for detecting pesticides on plant tissues in situ has been developed.

Malonamide dithiocarbamate functionalized gold nanoparticles for colorimetric sensing of Cu2+ and Hg2+ ions

RSC Advances ◽  
2015 ◽  
Vol 5 (6) ◽  
pp. 4245-4255 ◽  
Author(s):  
Vaibhavkumar N. Mehta ◽  
Suresh Kumar Kailasa
Keyword(s):  
Gold Nanoparticles ◽  
Colorimetric Detection ◽  
Colorimetric Sensing ◽  
Au Nps ◽  
Colorimetric Probe ◽  
Functionalized Gold Nanoparticles

In this study, a colorimetric probe was developed based on malonamide dithiocarbamate functionalized gold nanoparticles (MA–DTC–Au NPs) for the simultaneous colorimetric detection of Cu2+ and Hg2+ ions.

Sensitive colorimetric detection of cyromazine in cucumber samples by using label-free gold nanoparticles and polythymine

The Analyst ◽  
2015 ◽  
Vol 140 (9) ◽  
pp. 3064-3069 ◽  
Author(s):  
Jinchuan Liu ◽  
Wenhui Bai ◽  
Chao Zhu ◽  
Mengmeng Yan ◽  
Shuming Yang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Colorimetric Detection ◽  
Colorimetric Method ◽  
Label Free ◽  
Free Gold

A sensitive colorimetric method for cyromazine detection in cucumber samples was developed by using label-free gold nanoparticles and polythymine.

scholarly journals Dual Sensing Performance of 1,2-Squaraine for the Colorimetric Detection of Fe3+ and Hg2+ Ions

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1998 ◽  
Author(s):  
Xiaoqian Liu ◽  
Na Li ◽  
Min-Min Xu ◽  
Chunhui Jiang ◽  
Jianhao Wang ◽  
...  
Keyword(s):  
Metal Ions ◽  
Environmental Protection Agency ◽  
Direct Detection ◽  
Low Cost ◽  
Colorimetric Detection ◽  
Colorimetric Method ◽  
Binding Mode ◽  
Dual Metal ◽  
Sensing Performance ◽  
Dual Sensing

A simple 1,2-squaraine based chemosensor material (SQ) has been reported to show dual sensing performance for colorimetric detection of Fe3+ and Hg2+ ions. Compared to common instrumental analysis, this method could provide fast and direct detection though colorimetric changes by the naked eye. The sensor has shown excellent selectivity over the other metal ions by tuning different solvent environments. The detection limit for Fe3+ could reach to 0.538 μM, which was lower than that in the environmental agency guideline (U.S. Environmental Protection Agency, U.S. EPA) in drinking water. And for Hg2+ detection, the limit was calculated as 1.689 μM in our case. A 1:1 binding mode between SQ–Fe3+ and SQ–Hg2+ ion were evidenced by Job’s plot measurement and IR analysis. The proposed different binding mechanisms were also supported by Density Function Theory (DFT) calculation. All these findings provide a unique material and a simple, facile, and low cost colorimetric method for dual metal ions analysis and have shown preliminary analytical applications in industrial water sample analysis.

Colorimetric Detection of Melamine Based on Poly-Thymine Stabilized Gold Nanoparticles

2013 ◽  
Vol 790 ◽  
pp. 619-622
Author(s):  
Chong Jin ◽  
Hui Min Zhao ◽  
Meng Liu ◽  
Jun Ping Tian ◽  
Xie Quan
Keyword(s):  
Gold Nanoparticles ◽  
Color Change ◽  
Limit Of Detection ◽  
Pure Water ◽  
Colorimetric Detection ◽  
Colorimetric Method ◽  
Milk Powder ◽  
Aggregation Process ◽  
Naked Eye ◽  
Fresh Milk

A simple, fast and reliable colorimetric method for melamine detection based on gold nanoparticles (AuNPs) and poly-thymine (poly-T) is reported. Poly-T strands attract AuNPs through static electricity and keep them stable against aggregation in the presence of NaCl. The affinity between melamine and poly-T, hydrogen bond, frees AuNP from the protection provided by poly-T and thus makes AuNPs aggregate in the presence of NaCl. The color change of AuNPs from wine red to blue can be observed immediately by the naked eye during the aggregation process, and can be accurately recorded with the help of a UV/vis spetrophotometer within 5 minutes. The limit of detection (LOD) of melamine in pure water is 0.146 μmol/L with a linear range from 0.2×10-7 mol/L to 10.0×10-7 mol/L. In fresh milk and milk powder, the LOD is respectively as low as 2.37 μmol/L and 5.36 μmol/L.

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