scholarly journals 3,4-Methylenedioxypyrovalerone (MDPV) Sensing Based on Electropolymerized Molecularly Imprinted Polymers on Silver Nanoparticles and Carboxylated Multi-Walled Carbon Nanotubes

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 353
Author(s):  
Rosa A. S. Couto ◽  
Constantino Coelho ◽  
Bassim Mounssef ◽  
Sara F. de A. Morais ◽  
Camila D. Lima ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Silver Nanoparticles ◽  
Density Functional ◽  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
Imprinted Polymer ◽  
Dft Methods ◽  
Molecularly Imprinted ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

3,4-methylenedioxypyrovalerone (MDPV) is a harmful and controlled synthetic cathinone used as a psychostimulant drug and as sport-enhancing substance. A sensor was developed for the direct analysis of MDPV by transducing its oxidation signal by means of an electropolymerized molecularly imprinted polymer (e-MIP) built in-situ on the screen-printed carbon electrode’s (SPCE) surface previously covered with multi-walled carbon nanotubes (MWCNTs) and silver nanoparticles (AgNPs). Benzene-1,2-diamine was used as the functional monomer while the analyte was used as the template monomer. Each step of the sensor’s development was studied by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) in a solution containing ferricyanide, however no redox probe was required for the actual MDPV measurements. The interaction between the poly(o-phenylenediamine) imprinted polymer and MDPV was studied by density-functional theory (DFT) methods. The SPCE-MWCNT-AgNP-MIP sensor responded adequately to the variation of MDPV concentration. It was shown that AgNPs enhanced the electrochemical signal by around a 3-fold factor. Making use of square-wave voltammetry (SWV) the developed sensor provided a limit of detection (LOD) of 1.8 μmol L–1. The analytical performance of the proposed sensor paves the way to the development of a portable device for MDPV on-site sensing to be applied in forensic and doping analysis.

Preparation of Molecularly Imprinted Polypyrrole and Carbon Nanotubes Film Modified Electrode for Dopamine Recognition

2012 ◽  
Vol 578 ◽  
pp. 105-108 ◽  
Author(s):  
Fei Fei Zhang ◽  
Zong Hua Wang ◽  
Jian Fei Xia ◽  
Yan Zhi Xia ◽  
Feng Cai ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Modified Electrode ◽  
High Selectivity ◽  
Electrochemical Impedance ◽  
Good Sensitivity ◽  
Optimum Conditions ◽  
Molecularly Imprinted ◽  
Multi Walled Carbon Nanotubes ◽  
Overoxidized Polypyrrole ◽  
Walled Carbon Nanotubes

A novel film of overoxidized polypyrrole and carboxylic multi-walled carbon nanotubes (c-MWNTs) was fabricated with molecular imprinted technique for dopamine by a direct and facile electropolymerization method. The resulting modified electrode surface was characterized with electrochemical impedance spectroscopy and Fourier transform infrared spectroscopy. The results demonstrated that the modified electrode not only possessed a good sensitivity but also exhibited a high selectivity toward DA which making anodic potential difference of DA and AA is 318 mV in DPV. Under the optimum conditions, the linear range of the dopamine biosensor ranges from 5.0×10−8 to 6.0×10−6 mol/L with a detection limit of 5.0×10−9 mol/L

Fabrication of an electrochemical sensor based on magnetic multi-walled carbon nanotubes for the determination of ciprofloxacin

2016 ◽  
Vol 8 (16) ◽  
pp. 3383-3390 ◽  
Author(s):  
H. Bagheri ◽  
H. Khoshsafar ◽  
S. Amidi ◽  
Y. Hosseinzadeh Ardakani
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Sensor ◽  
Molecularly Imprinted Polymer ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Fabrication of an electrochemical sensor based on a composite of magnetic multi-walled carbon nanotubes – molecularly imprinted polymer for the determination of ciprofloxacin.

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