Determination of iron in biodiesel based on fluorescence quenching of CdTe quantum dots

Fuel ◽  
2014 ◽  
Vol 117 ◽  
pp. 520-527 ◽  
Author(s):  
S. Sofia M. Rodrigues ◽  
Adriana S. Lima ◽  
Leonardo S.G. Teixeira ◽  
Maria das Graças A. Korn ◽  
João L.M. Santos
Keyword(s):  
Quantum Dots ◽  
Fluorescence Quenching ◽  
Cdte Quantum Dots

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.

Determination of captopril using selective photoluminescence enhancement of 2-mercaptopropionic modified CdTe quantum dots

2014 ◽  
Vol 1 (2) ◽  
pp. 026202 ◽  
Author(s):  
Sarzamin Khan ◽  
Alex A Lima ◽  
Dunieskys G Larrudé ◽  
Eric C Romani ◽  
Ricardo Q Aucelio
Keyword(s):  
Quantum Dots ◽  
Cdte Quantum Dots ◽  
Photoluminescence Enhancement

In-line single-phase extraction for direct determination of total iron in oils using CdTe quantum dots and a flow-batch system

2015 ◽  
Vol 7 (18) ◽  
pp. 7707-7714 ◽  
Author(s):  
Marcelo B. Lima ◽  
Stéfani Iury E. Andrade ◽  
Inakã S. Barreto ◽  
Mário César U. Araújo
Keyword(s):  
Quantum Dots ◽  
Single Phase ◽  
Direct Determination ◽  
Total Iron ◽  
Cdte Quantum Dots ◽  
Phase Extraction ◽  
Batch System ◽  
System P ◽  
Novel Method

In this work, a novel method for direct determination of total iron in viscous samples is presented.

Rapid determination of melamine in milk using water-soluble CdTe quantum dots as fluorescence probes

2011 ◽  
pp. 1-12 ◽  
Author(s):  
Minwei Zhang† ◽  
Hong Ping† ◽  
Xianyi Cao ◽  
Hongkun Li ◽  
Fengrui Guan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Rapid Determination ◽  
Water Soluble ◽  
Cdte Quantum Dots ◽  
Fluorescence Probes

A new fluorimetric method for determination of valproic acid using TGA-capped CdTe quantum dots as proton sensor

2014 ◽  
Vol 145 ◽  
pp. 253-258 ◽  
Author(s):  
Mohammad-Hossein Sorouraddin ◽  
Amin Imani-Nabiyyi ◽  
Seyed Ali Najibi-Gehraz ◽  
Mohammad-Reza Rashidi
Keyword(s):  
Valproic Acid ◽  
Quantum Dots ◽  
Cdte Quantum Dots ◽  
Fluorimetric Method
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