The sol–gel route effect on the preparation of molecularly imprinted silica-based materials for selective and competitive photocatalysis

Author(s):  
Cícero Coelho de Escobar ◽  
Alexsandro Dallegrave ◽  
Marla Azário Lasarin ◽  
João Henrique Zimnoch dos Santos
2020 ◽  
Vol 17 ◽  
Author(s):  
Dan Qiao ◽  
Qiliang Deng ◽  
Shuo Wang

Background: The approach for the determination of aminoimidazo-azaarenes (AIAs) is urgent required due to their mutagenic activity and potential carcinogenicity. For this purpose, a CdSe/ZnS quantum dots (CdSe/ZnS QDs) - embedded molecularly imprinted silica gel with high selectivity and sensitivity was successfully prepared and applied to analyze such target. Methods: Herein, CdSe/ZnS QDs acted as the fluorescent probe, and molecularly imprinted silica gel as recognition probe was synthesized on the surface of QDs via sol-gel method. 2-Aminobenzimidazole, which has a similar structure with AIAs, as well as low cost and low toxicity, was selected as the dummy template. Results: The material has a high imprinting factor (IF=6.15); the linear range of CdSe/ZnS@MIP as a fluorescent sensing material for AIAs is 0.5-20.0 μg L -1 with the limit of detection (LOD) of 0.25 μg L -1 (3σ/s). Moreover, the fluorescent materials have been further applied to determine AIAs in beef floss and grilled fish fillet with satisfactory recoveries (82.8-110.8 %), and the relative standard deviation (RSD) is < 5.5%. Conclusion: The proposed CdSe/ZnS QDs-embedded molecularly imprinted silica gel can be used to easily and selectively detect AIAs.


2015 ◽  
Vol 15 (3) ◽  
pp. 262-270 ◽  
Author(s):  
T. Lopez ◽  
M.A. Francos ◽  
A. Gonzalez ◽  
M.E. Diaz-Garcia ◽  
R. Badia-Laino

RSC Advances ◽  
2021 ◽  
Vol 11 (13) ◽  
pp. 7732-7737
Author(s):  
Fenying Wang ◽  
Dan Wang ◽  
Tingting Wang ◽  
Yu Jin ◽  
Baoping Ling ◽  
...  

Fluorescent molecularly imprinted polymer (FMIP) gains great attention in many fields due to their low cost, good biocompatibility and low toxicity. Here, a high-performance FMIP was prepared based on the autocatalytic silica sol–gel reaction.


Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 631
Author(s):  
Narges Shaabani ◽  
Nora W. C. Chan ◽  
Abebaw B. Jemere

A molecularly imprinted sol-gel is reported for selective and sensitive electrochemical determination of the drug naloxone (NLX). The sensor was developed by combining molecular imprinting and sol-gel techniques and electrochemically grafting the sol solution onto a functionalized multiwall carbon nanotube modified indium-tin oxide (ITO) electrode. The sol-gel layer was obtained from acid catalyzed hydrolysis and condensation of a solution composed of triethoxyphenylsilane (TEPS) and tetraethoxysilane (TES). The fabrication, structure and properties of the sensing material were characterized via scanning electron microscopy, spectroscopy and electrochemical techniques. Parameters affecting the sensor’s performance were evaluated and optimized. A sensor fabricated under the optimized conditions responded linearly between 0.0 µM and 12 µM NLX, with a detection limit of 0.02 µM. The sensor also showed good run-to-run repeatability and batch-to-batch performance reproducibility with relative standard deviations (RSD) of 2.5–7.8% (n = 3) and 9.2% (n = 4), respectively. The developed sensor displayed excellent selectivity towards NLX compared to structurally similar compounds (codeine, fentanyl, naltrexone and noroxymorphone), and was successfully used to measure NLX in synthetic urine samples yielding recoveries greater than 88%.


2008 ◽  
Vol 19 (6) ◽  
pp. 1136-1143 ◽  
Author(s):  
Eduardo J. Pilau ◽  
Raquel G. C. Silva ◽  
Isabel C. F. S. Jardim ◽  
Fabio Augusto

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