scholarly journals Highly Selective Electrochemiluminescence Sensor Based on Molecularly Imprinted-quantum Dots for the Sensitive Detection of Cyfluthrin

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 884 ◽  
Author(s):  
Jinjin Xu ◽  
Rongrong Zhang ◽  
Chenxi Liu ◽  
Aili Sun ◽  
Jiong Chen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Rapid Determination ◽  
High Sensitivity ◽  
Multiwall Carbon Nanotube ◽  
Molecularly Imprinted ◽  
Grafting Technique ◽  
Seawater Samples ◽  
Multiwall Carbon ◽  
High Sensitivity Detection

A highly selective and sensitive molecularly imprinted electrochemiluminescence (MIECL) sensor was developed based on the multiwall carbon nanotube (MWCNT)-enhanced molecularly imprinted quantum dots (MIP-QDs) for the rapid determination of cyfluthrin (CYF). The MIP-QDs fabricated by surface grafting technique exhibited excellent selective recognition to CYF, resulting in a specific decrease of ECL signal at the MWCNT/MIP-QD modified electrode. Under optimal conditions, the MIECL signal was proportional to the logarithm of the CYF concentration in the range of 0.2 µg/L to 1.0 × 103 µg/L with a determination coefficient of 0.9983. The detection limit of CYF was 0.05 µg/L, and good recoveries ranging from 86.0% to 98.6% were obtained in practical samples. The proposed MIECL sensor provides a novel, rapid, high sensitivity detection strategy for successfully analyzing CYF in fish and seawater samples.

scholarly journals Molecularly Imprinted Polymers-Coated CdTe Quantum Dots for Highly Sensitive and Selective Fluorescent Determination of Ferulic Acid

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Zhihong Wang ◽  
Ruiqing Long ◽  
Mijun Peng ◽  
Te Li ◽  
Shuyun Shi
Keyword(s):  
Quantum Dots ◽  
Ferulic Acid ◽  
Molecularly Imprinted Polymers ◽  
High Sensitivity ◽  
Complex Matrix ◽  
Molecularly Imprinted ◽  
Imprinted Polymers ◽  
Cdte Qds ◽  
Sensitive Determination

Ferulic acid (FA), an important phenolic acid, is widely distributed in higher plants and presents many pharmacological effects. Therefore, sensitive determination of FA in complex matrix is necessary. Molecularly imprinted polymers-coated CdTe quantum dots (CdTe-QDs@MIPs) exhibited incomparable advantages because of their combination of excellent selectivity of MIPs and high sensitivity of QDs. Here, a fluorescent probe based on CdTe-QDs@MIPs was successfully fabricated for selective and sensitive determination of FA. MIPs shell was obtained by the reverse microemulsion method using FA, 3-(aminopropyl) triethoxysilane (APTES), and tetraethyl orthosilicate (TEOS), as template, functional monomer, and crosslinker. In optimal conditions, the fluorescence CdTe-QDs@MIPs sensor exhibited fast response (within only 3 min), high sensitivity (limit of detection, LOD at 0.85 μg/l), excellent linear ranges (2–100 μg/l) with a correlation coefficient of 0.9996, and distinguished selectivity for FA. Satisfactory recoveries from 91.8% to 110.3% were achieved with precisions below 6.6% for FA analysis in real pineapple juice and apple juice by developed CdTe-QDs@MIPs. The fluorescence results coincided well with those obtained by high-performance liquid chromatography (HPLC). It could be concluded that the resultant CdTe-QDs@MIPs offered a new way for rapid and sensitive analysis of FA in the complex matrix.

Determination of meloxicam in plasma samples using a highly selective and sensitive voltammetric sensor based on carbon paste electrodes modified by molecularly imprinted polymer nanoparticle–multiwall carbon nanotubes

2015 ◽  
Vol 7 (4) ◽  
pp. 1280-1292 ◽  
Author(s):  
Saman Azodi-Deilami ◽  
Ebadullah Asadi ◽  
Majid Abdouss ◽  
Fardin Ahmadi ◽  
Alireza Hassani Najafabadi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwall Carbon Nanotubes ◽  
Voltammetric Sensor ◽  
Plasma Samples ◽  
Carbon Paste ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Carbon Paste Electrodes ◽  
Multiwall Carbon

A highly selective voltammetric sensor for the determination of meloxicam using a MIP@MWCNT–CPE is introduced.

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