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.

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.

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.

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.

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.

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.

Anisotropic gold nanoparticles for the highly sensitive colorimetric detection of glucose in human urine

RSC Advances ◽  
2015 ◽  
Vol 5 (51) ◽  
pp. 40849-40855 ◽  
Author(s):  
Abhishek Chaudhary ◽  
Abhishek Gupta ◽  
Chayan Kanti Nandi
Keyword(s):  
Gold Nanoparticles ◽  
Human Urine ◽  
Colorimetric Detection ◽  
Highly Sensitive ◽  
Anisotropic Gold Nanoparticles

PEDOT:PSS modified anisotropic gold nanoparticles (GNP) for the colorimetric detection of glucose in urine.

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.

scholarly journals A Universal Fast Colorimetric Method for DNA Signal Detection with DNA Strand Displacement and Gold Nanoparticles

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Xin Li ◽  
Tao Song ◽  
Zhihua Chen ◽  
Xiaolong Shi ◽  
Congzhou Chen ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Signal Detection ◽  
Colorimetric Detection ◽  
Colorimetric Method ◽  
Strand Displacement ◽  
Target Dna ◽  
Dna Strand Displacement ◽  
Or Gene ◽  
Dna Strand ◽  
Visual Results

DNA or gene signal detection is of great significance in many fields including medical examination, intracellular molecular monitoring, and gene disease signal diagnosis, but detection of DNA or gene signals in a low concentration with instant visual results remains a challenge. In this work, a universal fast and visual colorimetric detection method for DNA signals is proposed. Specifically, a DNA signal amplification “circuit” based on DNA strand displacement is firstly designed to amplify the target DNA signals, and then thiol modified hairpin DNA strands and gold nanoparticles are used to make signal detection results visualized in a colorimetric manner. If the target DNA signal exists, the gold nanoparticles aggregate and settle down with color changing from dark red to grey quickly; otherwise, the gold nanoparticles’ colloids remain stable in dark red. The proposed method provides a novel way to detect quickly DNA or gene signals in low concentrations with instant visual results. When applied in real-life, it may provide a universal colorimetric method for gene disease signal diagnosis.

Enzyme mediated assembly of gold nanoparticles for ultrasensitive colorimetric detection of hepatitis C virus antibody

2017 ◽  
Vol 9 (25) ◽  
pp. 3777-3781 ◽  
Author(s):  
Yu-Hong Cheng ◽  
Hao Tang ◽  
Jian-Hui Jiang
Keyword(s):  
Gold Nanoparticles ◽  
Hepatitis C Virus ◽  
Hepatitis C ◽  
Colorimetric Detection ◽  
Colorimetric Method ◽  
Ultrasensitive Detection ◽  
Virus Antibody ◽  
Hepatitis C Virus Antibody

A novel enzyme mediated AuNP assembly based colorimetric method for ultrasensitive detection of hepatitis C virus antibody.

scholarly journals Selective and colorimetric detection of Ba2+ ions in aqueous solutions using 11-mercaptoundecylphosphonic acid functionalized gold nanoparticles

RSC Advances ◽  
2017 ◽  
Vol 7 (50) ◽  
pp. 31611-31618 ◽  
Author(s):  
Blanca A. García Grajeda ◽  
Samuel G. Soto Acosta ◽  
Sergio A. Aguila ◽  
Héctor Peinado Guevara ◽  
Marta E. Díaz-García ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Gold Nanoparticles ◽  
Aqueous Solutions ◽  
Colorimetric Detection ◽  
Colorimetric Method ◽  
Selective Detection ◽  
Functionalized Gold Nanoparticles

In this paper we describe a simple colorimetric method for the sensitive and selective detection of Ba2+ ions, using 11-mercaptoundecylphosphonic acid functionalized gold nanoparticles (AuNPs–MPA) in aqueous solution.

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