1. Ionic liquid terpolymer/iron oxide/multiwalled carbon nanotube nanocomposite electrode for the voltammetric detection of dopamine in the presence of ascorbic acid.
- Author
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Resende, Graciane, Gross, Marcos A., Dutra, Gabriel V.S., Neto, Brenno A.D., da Silva, Sebastião W., Paterno, Leonardo G., and Machado, Fabricio
- Subjects
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FERRIC oxide , *CARBON nanotubes , *VITAMIN C , *DOPAMINE , *IONIC liquids , *ELECTRODES , *CARBON electrodes - Abstract
[Display omitted] • A novel electrochemical sensor for dopamine detection was successfully developed. • The IL terpolymer/iron oxide/MWCNT electrode displayed a great synergistic response. • Dopamine was detected in the presence of a 25-fold excess of ascorbic acid. • After 80 runs TS-MAG-MWCNT electrode showed only an 8% reduction in its sensitivity. • Sensor response is not affected by the matrix composition or other interferents. In this study, we introduce a novel electrochemical sensor for dopamine (DA) detection utilizing an ionic liquid-based terpolymer/iron oxide/multiwalled carbon nanotube (TS-MAG-MWCNT) nanocomposite electrode. The synergistic combination of improved surface adhesion, electrocatalytic activity, and electron conductivity of each individual material enables the determination of DA in the presence of a 25-fold excess of AA (ascorbic acid). The electrode, operated by square wave voltammetry, allows the detection of DA within a wide linear working range from 1 µmol/L to 200 µmol/L, with a limit of detection of 63 nmol/L. A single TS-MAG-MWCNT electrode can be used for more than 80 consecutive runs, with only an 8 % reduction in its sensitivity. Additionally, the response of electrodes fabricated in different batches varies by only 5 %. The sensor's response is not affected by the matrix composition or other interferents, as demonstrated by experiments conducted in synthetic urine. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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