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

Electrochemical Determination of Rivastigmine Hydrogen Tartrate at β-Cyclodextrin/Multi-Walled Carbon Nanotubes Modified Electrode

2019 ◽  
Vol 15 (3) ◽  
pp. 211-216
Author(s):  
Bugçe Kılıçyaldır ◽  
Asiye Aslıhan Avan ◽  
Kubilay Güçlü ◽  
Mustafa Özyürek ◽  
Hayati Filik
Keyword(s):  
Carbon Nanotubes ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Pharmaceutical Formulations ◽  
Carbon Electrode ◽  
Good Sensitivity ◽  
Modified Glassy Carbon Electrode ◽  
Chemically Modified ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Background: Electrochemical techniques can easily be adopted to solve many problems of pharmaceutical interest. The implementation of electroanalytical methods in the assay of pharmaceutical formulations has increased greatly. Nowadays, owing to the critical importance of electron transfer and surface properties, chemically modified electrodes have been employed in electrochemical sensors. The chemically modified electrode is one of the most popular electroanalytical sensors and used in several applications. Methods: In this work, a β-cyclodextrine/multi-walled carbon nanotubes (β-CD/MWCNTs) composite modified glassy carbon electrode (GCE) was produced and applied to the detection of Rivastigmine hydrogen tartrate (RVT) in pharmaceutical formulations. The voltammetric feature of RVT at this β- CD/MWCNTs modified electrode was evaluated using cyclic voltammetry and square wave voltammetry. Results: The β-cyclodextrin and multi-walled carbon nanotubes modified glassy carbon electrode displayed good electrocatalytic activity in the oxidation of rivastigmine hydrogen tartrate with relatively high sensitivity, stability and lifetime. The calibration graph of the analyte was linear over the range 10- 1500 µM with two linear segments and the detection limit was obtained as 2.0 µM (S/N=3). The results showed that the electrochemical sensor has good sensitivity and selectivity. Conclusion: The β-CD/MWCNTs modified electrode displayed a high electrochemical activity and good sensitivity toward the oxidation of RVT. Compared with the bare MWCNTs coated sensor, the response of analyte increased soundly and the response potential of target analyte shifted negatively. The results indicated that the β-CD/MWCNTs film coated electrode had good catalysis to the voltammetric oxidation of RVT. The prepared sensor was applied to determine RVT in pharmaceutical samples with satisfactory yields. The outcomes indicate that β-CD/MWCNTs coated electrode is a safe choice for the detection of RVT.

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.

Multi-walled carbon nanotubes–chitosan with a branched structure modified with ferrocenecarboxylic acid for carcinoembryonic antigen detection

2015 ◽  
Vol 7 (23) ◽  
pp. 10032-10039 ◽  
Author(s):  
Taotao Feng ◽  
Xiuwen Qiao ◽  
Haining Wang ◽  
Zhao Sun ◽  
Chenglin Hong
Keyword(s):  
Carbon Nanotubes ◽  
Carcinoembryonic Antigen ◽  
Modified Electrode ◽  
Electrochemical Immunosensor ◽  
Antigen Detection ◽  
Multi Walled Carbon Nanotubes ◽  
Ferrocenecarboxylic Acid ◽  
Branched Structure ◽  
Walled Carbon Nanotubes

A novel electrochemical immunosensor for the detection of CEA was proposed based on Fc-COOH connected to the branched structure of a MWCNT–CS complex modified electrode.

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