Few-layered MoSe2 nanosheets as an efficient peroxidase nanozyme for highly sensitive colorimetric detection of H2O2 and xanthine

2018 ◽  
Vol 6 (1) ◽  
pp. 105-111 ◽  
Author(s):  
Xiaoju Wu ◽  
Tongming Chen ◽  
Jianxing Wang ◽  
Guowei Yang
Keyword(s):  
Colorimetric Detection ◽  
High Sensitivity ◽  
Highly Sensitive ◽  
Sensitivity And Selectivity

MoSe2 nanosheets possess intrinsic peroxidase-like activity and are applied to H2O2 and xanthine detection with high sensitivity and selectivity.

A highly sensitive turn-on ratiometric luminescent probe based on postsynthetic modification of Tb3+@Cu-MOF for H2S detection

2017 ◽  
Vol 5 (38) ◽  
pp. 9943-9951 ◽  
Author(s):  
Xubin Zheng ◽  
Ruiqing Fan ◽  
Yang Song ◽  
Ani Wang ◽  
Kai Xing ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Luminescent Probe ◽  
Turn On ◽  
Postsynthetic Modification ◽  
Highly Sensitive ◽  
Sensitivity And Selectivity ◽  
H2s Detection

A novel probe, designed and prepared through PSM of Cu-MOFs and Tb3+ions, shows high sensitivity and selectivity for H2S.

A metal-organic framework featuring highly sensitive fluorescence sensing for Al3+ ion

CrystEngComm ◽  
2021 ◽  
Author(s):  
Yang Qiao ◽  
Zeqi Li ◽  
Mei-Hui Yu ◽  
Ze Chang ◽  
Xian-He Bu
Keyword(s):  
Metal Ions ◽  
Human Health ◽  
Metal Organic Framework ◽  
High Sensitivity ◽  
Fluorescence Sensing ◽  
Sensing Material ◽  
Highly Sensitive ◽  
Sensitivity And Selectivity ◽  
Metal Organic ◽  
Organic Framework

High sensitivity and selectivity for detection of metal ions are very important to protect human health. Fluorescent metal-organic framework (MOF) as a new sensing material has attracted more and more...

scholarly journals Colorimetric Detection of Sulfide Anions via Redox-Modulated Surface Chemistry and Morphology of Au-Hg Nanorods

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Xiaotian Zhu ◽  
Chang Liu ◽  
Jie Liu
Keyword(s):  
Surface Chemistry ◽  
Colorimetric Assay ◽  
Colorimetric Detection ◽  
High Sensitivity ◽  
Localized Surface Plasmon ◽  
Wavelength Shift ◽  
Colorimetric Sensing ◽  
Leather Industry ◽  
Colorimetric Response ◽  
Sensitivity And Selectivity

A new colorimetric assay for the detection of sulfide anions with high sensitivity and selectivity is reported, utilizing Au-Hg alloy nanorods (Au-HgNRs) as probe. Au-HgNRs were prepared by modifying gold nanorods (AuNRs) with reducing agent and mercury ions. In an aqueous solution with sulfide anions, the formation of mercuric sulfide due to redox reaction between the amalgams and sulfide anions greatly changed the surface chemistry and morphology of the Au-HgNRs, leading to a red shift of the localized surface plasmon resonance (LSPR) absorption peak, accompanied by a change in colorimetric response. A good linear relationship was obtained between the LSPR peak wavelength shift and concentration of sulfide anion in the range of 1 × 10−5−1 × 10−4 mol/L. The selectivity of this method has been investigated by other anions. The colorimetric sensing system successfully detected sulfide in wastewater from leather industry.

A highly sensitive and selective fluorescent turn-on chemosensor bearing a 7-diethylaminocoumarin moiety for the detection of cyanide in organic and aqueous solutions

2020 ◽  
Vol 44 (44) ◽  
pp. 19155-19165
Author(s):  
Burcu Aydıner ◽  
Ömer Şahin ◽  
Deniz Çakmaz ◽  
Gökhan Kaplan ◽  
Kerem Kaya ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Emission Intensity ◽  
High Sensitivity ◽  
Turn On ◽  
Highly Sensitive ◽  
Sensitivity And Selectivity

Novel 7-diethylaminocoumarin based dyes showed high sensitivity and selectivity to cyanide anions in both organic and aqueous solutions, which was observed by a drastic increment in the emission intensity.

scholarly journals Highly Sensitive, Selective, Flexible and Scalable Room-Temperature NO2 Gas Sensor Based on Hollow SnO2/ZnO Nanofibers

Molecules ◽  
2021 ◽  
Vol 26 (21) ◽  
pp. 6475
Author(s):  
Jiahui Guo ◽  
Weiwei Li ◽  
Xuanliang Zhao ◽  
Haowen Hu ◽  
Min Wang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Gas Sensing ◽  
Positive Impact ◽  
High Sensitivity ◽  
Detection Sensitivity ◽  
Pure Sno2 ◽  
Flexible Devices ◽  
Low Concentrations ◽  
Highly Sensitive ◽  
Sensitivity And Selectivity

Semiconducting metal oxides can detect low concentrations of NO2 and other toxic gases, which have been widely investigated in the field of gas sensors. However, most studies on the gas sensing properties of these materials are carried out at high temperatures. In this work, Hollow SnO2 nanofibers were successfully synthesized by electrospinning and calcination, followed by surface modification using ZnO to improve the sensitivity of the SnO2 nanofibers sensor to NO2 gas. The gas sensing behavior of SnO2/ZnO sensors was then investigated at room temperature (~20 °C). The results showed that SnO2/ZnO nanocomposites exhibited high sensitivity and selectivity to 0.5 ppm of NO2 gas with a response value of 336%, which was much higher than that of pure SnO2 (13%). In addition to the increase in the specific surface area of SnO2/ZnO-3 compared with pure SnO2, it also had a positive impact on the detection sensitivity. This increase was attributed to the heterojunction effect and the selective NO2 physisorption sensing mechanism of SnO2/ZnO nanocomposites. In addition, patterned electrodes of silver paste were printed on different flexible substrates, such as paper, polyethylene terephthalate and polydimethylsiloxane using a facile screen-printing process. Silver electrodes were integrated with SnO2/ZnO into a flexible wearable sensor array, which could detect 0.1 ppm NO2 gas after 10,000 bending cycles. The findings of this study therefore open a general approach for the fabrication of flexible devices for gas detection applications.

Sensitive, colorimetric enzyme amplification cascade for determination of alkaline phosphatase and application of the method to an immunoassay of thyrotropin

1991 ◽  
Vol 37 (9) ◽  
pp. 1513-1518 ◽  
Author(s):  
D M Obzansky ◽  
B R Rabin ◽  
D M Simons ◽  
S Y Tseng ◽  
D M Severino ◽  
...  
Keyword(s):  
Alkaline Phosphatase ◽  
Colorimetric Detection ◽  
High Sensitivity ◽  
Acid Oxidase ◽  
Amino Acid Oxidase ◽  
Highly Sensitive ◽  
Wide Range ◽  
Colored Product ◽  
Enzyme Amplification ◽  
Amplification Cascade

Abstract A highly sensitive flavin adenine dinucleotide-3'-phosphate (FADP)-based enzyme amplification cascade has been developed for determining alkaline phosphatase (ALP; EC 3.1.3.1). The cascade detects ALP via the dephosphorylation of the novel substrate FADP to produce the cofactor FAD, which binds stoichiometrically to inactive apo D-amino acid oxidase (D-AAO). The resulting active holo D-AAO oxidizes D-proline to produce hydrogen peroxide, which is quantified by the horseradish peroxidase-mediated conversion of 3,5-dichloro-2-hydroxybenzenesulfonic acid and 4-aminoantipyrine to a colored product. The FADP-based enzyme amplification cascade has been used in a novel releasable linker immunoassay (RELIA) to quantify thyrotropin (TSH). In the assay, TSH is first captured onto antibody-coated chromium dioxide particles. After formation of an antibody-TSH sandwich with a dethiobiotinylated second antibody, the complex is reacted with a streptavidin-ALP conjugate. Biotin is then used to release the conjugate into solution, and ALP is quantified in an automated version of the FADP-based amplification cascade on the aca discrete clinical analyzer (Du Pont). The sensitivity of the colorimetric RELIA assay for TSH (less than 0.1 milli-int. unit/L) is comparable with that of fluorometric assays. This technology provides a way to adapt to the aca high-sensitivity immunoassays for a wide range of analytes via colorimetric detection.

R-phycoerythrin proteins@ZIF-8 composite thin films for mercury ion detection

The Analyst ◽  
2019 ◽  
Vol 144 (12) ◽  
pp. 3892-3897 ◽  
Author(s):  
Xiaobin Wang ◽  
Zhishan Fang ◽  
Zhuoyi Li ◽  
Wen Ying ◽  
Danke Chen ◽  
...  
Keyword(s):  
Thin Films ◽  
Colorimetric Detection ◽  
High Sensitivity ◽  
Mercury Ion ◽  
Mercury Ions ◽  
Ion Detection ◽  
Composite Thin Films ◽  
Sensitivity And Selectivity ◽  
Mercury Ion Detection

Fluorescent R-phycoerythrin proteins were encapsulated into ZIF-8 thin films for colorimetric detection of mercury ions with high sensitivity and selectivity.

Highly sensitive and fast-response hydrogen sensing of WO3 nanoparticles via palladium reined spillover effect

Nanoscale ◽  
2021 ◽  
Author(s):  
Zhengyou Zhu ◽  
Xiaxia Xing ◽  
Dongliang Feng ◽  
Zhenxu Li ◽  
Yingying Tian ◽  
...  
Keyword(s):  
Spillover Effect ◽  
High Sensitivity ◽  
Fast Response ◽  
Hydrogen Sensing ◽  
Highly Sensitive ◽  
Sensitivity And Selectivity

Hydrogen sensing simultaneously endowed with fast response, high sensitivity and selectivity are highly desired in detecting hydrogen leakages such as in those hydrogen-driven vehicles and space rockets. Here, hydrogen sensing...

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.

A highly sensitive and selective “turn-on” fluorescent probe for detection of fleroxacin in human serum and urine based on a lanthanide functionalized metal–organic framework

2019 ◽  
Vol 48 (48) ◽  
pp. 17945-17952 ◽  
Author(s):  
Tian-Yu Liu ◽  
Xiang-Long Qu ◽  
Bing Yan
Keyword(s):  
Human Serum ◽  
Metal Organic Framework ◽  
High Sensitivity ◽  
Luminescent Probe ◽  
Turn On ◽  
Highly Sensitive ◽  
Sensitivity And Selectivity ◽  
Metal Organic ◽  
Serum And Urine

A novel luminescent probe based on a Eu3+ functionalized MOF hybrid (Eu3+@1) with high sensitivity and selectivity has been proved to possess enormous potential for the determination of fleroxacin in human serum and urine.

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