Highly sensitive and selective colorimetric detection of Hg2+ based on the separation of Hg2+ and formation of catalytic DNA–gold nanoparticles

2016 ◽  
Vol 8 (5) ◽  
pp. 1021-1025 ◽  
Author(s):  
Chi-Fang Peng ◽  
Na Pan ◽  
Zheng-Jun Xie ◽  
Liang-Liang Wu
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Water Samples ◽  
Colorimetric Detection ◽  
Highly Sensitive ◽  
Catalytic Dna

Hg2+ ions can be absorbed onto a DNA–AuNP complex and separated from water samples while the catalytic activity of DNA–AuNPs can be promoted.

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.

scholarly journals Highly sensitive colorimetric detection of 17β-estradiol using split DNA aptamers immobilized on unmodified gold nanoparticles

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Jinchuan Liu ◽  
Wenhui Bai ◽  
Shucao Niu ◽  
Chao Zhu ◽  
Shuming Yang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Colorimetric Detection ◽  
Dna Aptamers ◽  
Highly Sensitive ◽  
17Β Estradiol

scholarly journals Enhancement of the Peroxidase-Like Activity of Iodine-Capped Gold Nanoparticles for the Colorimetric Detection of Biothiols

Biosensors ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 113 ◽  
Author(s):  
Chia-Chen Chang ◽  
Tsz-Lian Hsu ◽  
Chie-Pein Chen ◽  
Chen-Yu Chen
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Detection Limit ◽  
Enzymatic Activity ◽  
Catalytic Properties ◽  
Colorimetric Assay ◽  
Colorimetric Detection ◽  
Synergetic Effect ◽  
Vis Spectroscopy ◽  
Wide Range

A colorimetric assay was developed for the detection of biothiols, based on the peroxidase-like activity of iodine-capped gold nanoparticles (AuNPs). These AuNPs show a synergetic effect in the form of peroxidase-mimicking activity at the interface of AuNPs, while free AuNPs and iodine alone have weak catalytic properties. Thus, iodine-capped AuNPs possess good intrinsic enzymatic activity and trigger the oxidation of 3,3’,5,5’-tetramethylbenzidine (TMB), leading to a change in color from colorless to yellow. When added to solution, biothiols, such as cysteine, strongly bind to the interface of AuNPs via gold-thiol bonds, inhibiting the catalytic activity of AuNPs, resulting in a decrease in oxidized TMB. Using this strategy, cysteine could be linearly determined, at a wide range of concentrations (0.5 to 20 μM), with a detection limit of 0.5 μM using UV-Vis spectroscopy. This method was applied for the detection of cysteine in diluted human urine.

Zwitterionic peptide-capped gold nanoparticles for colorimetric detection of Ni2+

Nanoscale ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 5466-5473 ◽  
Author(s):  
Attasith Parnsubsakul ◽  
Sukunya Oaew ◽  
Werasak Surareungchai
Keyword(s):  
Gold Nanoparticles ◽  
Colorimetric Detection ◽  
Sensitive Detection ◽  
Highly Sensitive ◽  
Highly Sensitive Detection

Recyclable zwitterionic peptide-capped AuNPs for highly sensitive detection of Ni2+.

scholarly journals Erratum: Xie, Z.-J.; Bao, X.-Y.; Peng, C.-F. Highly Sensitive and Selective Colorimetric Detection of Methylmercury Based on DNA-Functionalized Gold Nanoparticles. Sensors 2018, 18, 2679.

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 3135
Author(s):  
Zheng-Jun Xie ◽  
Xian-Yu Bao ◽  
Chi-Fang Peng
Keyword(s):  
Gold Nanoparticles ◽  
Colorimetric Detection ◽  
Functionalized Gold Nanoparticles ◽  
Highly Sensitive

The authors wish to make the following corrections to their paper [...]

Silver Nanoprism for Selective and Sensitive Detection of Hg+2 Ions

2021 ◽  
Vol 21 (12) ◽  
pp. 6094-6100
Author(s):  
Avneesh Mittal ◽  
Komal Gupta ◽  
Balaram Pani ◽  
Gulshan Kumar ◽  
Gopala Ram Bhadu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Surface Plasmon Resonance ◽  
Detection Limit ◽  
Surface Plasmon ◽  
Water Samples ◽  
High Performance ◽  
Colorimetric Detection ◽  
Silver Nanoprisms ◽  
Highly Sensitive ◽  
Varied Concentration

In this article, we propose high-performance colorimetric detection of Hg+2 using silver nanoprisms. The spherical and triangular AgNPs were synthesized using varied concentration of NaBH4. Pristine AgNPs without any further modification were used for the detection of various metal ions including Hg2+, Pb2+, Cl−, Cd2+, Co2+, Cu2+, Ba2+, Pb2+, Cr3+, Cr2O2−7 , Fe2+, Fe3+ etc. AgNPs were not only selective in detecting the ions of Cl− and Hg+2 ions but also highly sensitive. Minimum detection limit was observed to be as low as 10−7 ppm for both Hg+2 and Cl−. Water samples collected from various locations detected for the presence of various heavy metals. Silver nanoprisms owing to their surface plasmon resonance exhibit highly selective tendency towards detection against Hg+2.

scholarly journals A simple, fast and highly sensitive colorimetric detection of zein in aqueous ethanol via zein–pyridine–gold interactions

2015 ◽  
Vol 51 (86) ◽  
pp. 15736-15738 ◽  
Author(s):  
Alejandro Latorre-Sanchez ◽  
Jose A. Pomposo
Keyword(s):  
Gold Nanoparticles ◽  
Aqueous Ethanol ◽  
Colorimetric Detection ◽  
Single Chain ◽  
Corn Protein ◽  
Highly Sensitive

Formation of gold nanoparticles in aqueous ethanol in the presence of pyridine-functionalized single-chain nanoparticles allows for the fast and highly sensitive colorimetric detection of zein corn protein.

Stable gold nanoparticles as a novel peroxidase mimic for colorimetric detection of cysteine

2016 ◽  
Vol 8 (11) ◽  
pp. 2494-2501 ◽  
Author(s):  
Rong Sheng Li ◽  
Hai Liu ◽  
Bin Bin Chen ◽  
Hong Zhi Zhang ◽  
Cheng Zhi Huang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Colorimetric Detection ◽  
High Sensitivity ◽  
Peroxidase Mimic ◽  
Sensitivity And Selectivity ◽  
Blue Solution

In this work, stable gold nanoparticles (AuNPs) were prepared with good compatibility and favorable catalytic activity. They were developed as a peroxidase mimic for colorimetric detection of cysteine with a weakened blue solution, which supplied high sensitivity and selectivity.

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