A practical aptaprobe for sulfadimethoxine residue detection in water and fish based on the fluorescence quenching of CdTe QDs by poly(diallyldimethylammonium chloride)

2020 ◽  
Vol 91 ◽  
pp. 103526
Author(s):  
Xiang-Xiu Chen ◽  
Zheng-Zhong Lin ◽  
Qiu-Hong Yao ◽  
Zhi-Yong Huang
Keyword(s):  
Fluorescence Quenching ◽  
Residue Detection ◽  
Diallyldimethylammonium Chloride ◽  
Cdte Qds

Heparin sodium-selective ‘on–off’ and lysine-selective ‘off–on’ fluorescence switching of cadmium telluride quantum dots and their analytical applications

2016 ◽  
Vol 8 (2) ◽  
pp. 453-459 ◽  
Author(s):  
Hong Zhi Zhang ◽  
Rong Sheng Li ◽  
Ni Wang ◽  
Li Qi ◽  
Cheng Zhi Huang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Hydrogen Bonding ◽  
Fluorescence Quenching ◽  
Cadmium Telluride ◽  
Electrostatic Interaction ◽  
Heparin Sodium ◽  
Strong Electrostatic Interaction ◽  
Cdte Qds ◽  
Fluorescence Switching ◽  
Cadmium Telluride Quantum Dots

The fluorescence quenching of CdTe QDs could be induced by heparin sodium via hydrogen bonding, which was then recovered by lysine through a strong electrostatic interaction.

scholarly journals Ultrasensitive fluorescence immunoassay for detection of ochratoxin A using catalase-mediated fluorescence quenching of CdTe QDs

Nanoscale ◽  
2016 ◽  
Vol 8 (17) ◽  
pp. 9390-9397 ◽  
Author(s):  
Xiaolin Huang ◽  
Shengnan Zhan ◽  
Hengyi Xu ◽  
Xianwei Meng ◽  
Yonghua Xiong ◽  
...  
Keyword(s):  
Fluorescence Quenching ◽  
Ochratoxin A ◽  
Fluorescence Immunoassay ◽  
Cdte Qds

scholarly journals CdTe Quantum Dots Modified with Cysteamine: A New Efficient Nanosensor for the Determination of Folic Acid

Sensors ◽  
2019 ◽  
Vol 19 (20) ◽  
pp. 4548 ◽  
Author(s):  
Doris E. Ramírez-Herrera ◽  
Ana Patricia Reyes-Cruzaley ◽  
Giselle Dominguez ◽  
Francisco Paraguay-Delgado ◽  
Antonio Tirado-Guízar ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Folic Acid ◽  
Fluorescence Quenching ◽  
Low Cost ◽  
Water Soluble ◽  
Cdte Quantum Dots ◽  
Photoluminescence Intensity ◽  
Beverage Samples ◽  
Cdte Qds

In this paper, we report the synthesis, characterization, and application of a new fluorescent nanosensor based on water-soluble CdTe quantum dots (QDs) coated with cysteamine (CA) for the determination of folic acid (FA). CdTe/CA QDs were characterized by high-resolution transmission electron microscopy, the zeta potential, and Fourier-transform infrared (FT-IR), UV-visible, and fluorescence spectroscopy. CdTe QDs coated with mercaptopropionic acid (MPA) and glutathione (GSH) were prepared for comparison purposes. The effect of FA on the photoluminescence intensity of the three thiol-capped QDs at pH 8 was studied. Only CdTe/CA QDs showed a notable fluorescence quenching in the presence of FA. Then, a nanosensor based on the fluorescence quenching of the CdTe QDs at pH 8 was explored. Under optimum conditions, the calibration curve showed a linear fluorescence quenching response in a concentration range of FA from 0.16 to 16.4 μM (R2 = 0.9944), with a detection limit of 0.048 μM. A probable mechanism of fluorescence quenching was proposed. The nanosensor showed good selectivity over other possible interferences. This method has been applied for FA quantification in orange beverage samples with excellent results (recoveries from 98.3 to 103.9%). The good selectivity, sensitivity, low cost, and rapidity make CdTe /CA QDs a suitable nanosensor for FA determination.

Fluorescence ELISA based on CAT-regulated fluorescence quenching of CdTe QDs for sensitive detection of FB1

2018 ◽  
Vol 10 (48) ◽  
pp. 5797-5802 ◽  
Author(s):  
Tianying Lu ◽  
Shengnan Zhan ◽  
Yaofeng Zhou ◽  
Xirui Chen ◽  
Xiaolin Huang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescence Quenching ◽  
Immunosorbent Assay ◽  
Cdte Quantum Dots ◽  
Sensitive Detection ◽  
Enzyme Linked Immunosorbent Assay ◽  
Mercaptopropionic Acid ◽  
Cdte Qds ◽  
Highly Sensitive ◽  
Highly Sensitive Detection

A competitive fluorescence enzyme-linked immunosorbent assay (cFELISA) was developed for the highly sensitive detection of fumonisin B1 (FB1) based on the catalase (CAT)-regulated fluorescence quenching of mercaptopropionic acid-modified CdTe quantum dots (MPA-QDs).

Fluorescence ELISA for sensitive detection of ochratoxin A based on glucose oxidase-mediated fluorescence quenching of CdTe QDs

2016 ◽  
Vol 936 ◽  
pp. 195-201 ◽  
Author(s):  
Yi Liang ◽  
Xiaolin Huang ◽  
Ruijin Yu ◽  
Yaofeng Zhou ◽  
Yonghua Xiong
Keyword(s):  
Fluorescence Quenching ◽  
Glucose Oxidase ◽  
Ochratoxin A ◽  
Sensitive Detection ◽  
Cdte Qds

Clinical Application and Results of the Assessment of Coronary Blood Flow by the Regional Precordial Xenon Residue Detection Technique

1978 ◽  
Vol 17 (04) ◽  
pp. 161-171
Author(s):  
H.-J. Engel ◽  
H. Hundeshagen ◽  
P. R. Lichtlen
Keyword(s):  
Wall Motion ◽  
High Flow ◽  
Detection Technique ◽  
Fatty Tissue ◽  
Technical Aspects ◽  
Residue Detection ◽  
High Affinity ◽  
Artery Disease ◽  
The Right ◽  
Drug Interventions

Methodological and technical aspects as well as application and results of the precordial Xenon-residue-detection technique are critically reviewed. The results concern mainly normal flow in various regions of the heart esp. in the free wall of the right and left ventricle, poststenotic flow in patients with coronary artery disease in relation to the degree of proximal nar-rowings as well as wall motion of the corresponding LV segment, bypassgraft flow and flow after drug interventions esp. nitrates, betablockers, the calcium-antagonist Nifedipine and the coronary dilator Dipyridamole. In spite of its serious limitations (high affinity of Xenon for fatty tissue, geometrical problems in the assessment of flow and its relation to anatomy, gas exchange in situations of high flow etc.), the technique is found to be a usefull investigatory tool. Due to its technical display and the related high costs routine application is, however, prohibitive.

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