Cited by 28Electrochemical sensors and biosensorsElectrochemical Analysis and ApplicationsElectrocatalysts for Energy Conversion

Development of a Nafion/MWCNT-SPCE-Based Portable Sensor for the Voltammetric Analysis of the Anti-Tuberculosis Drug Ethambutol

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Couto, Rosa, Quinaz, Maria·2016·Sensors

Abstract

Herein we describe the development, characterization and application of an electrochemical sensor based on the use of Nafion/MWCNT-modified screen-printed carbon electrodes (SPCEs) for the voltammetric detection of the anti-tuberculosis (anti-TB) drug ethambutol (ETB). The electrochemical behaviour of the drug at the surface of the developed Nafion/MWCNT-SPCEs was studied through cyclic voltammetry (CV) and square wave voltammetry (SWV) techniques. Electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) were employed to characterize the modified surface of the electrodes. Results showed that, compared to both unmodified and MWCNTs-modified SPCEs, negatively charged Nafion/MWCNT-SPCEs remarkably enhanced the electrochemical sensitivity and selectivity for ETB due to the synergistic effect of the electrostatic interaction between cationic ETB molecules and negatively charged Nafion polymer and the inherent electrocatalytic properties of both MWCNTs and Nafion. Nafion/MWCNT-SPCEs provided excellent biocompatibility, good electrical conductivity, low electrochemical interferences and a high signal-to-noise ratio, providing excellent performance towards ETB quantification in microvolumes of human urine and human blood serum samples. The outcomes of this paper confirm that the Nafion/MWCNT-SPCE-based device could be a potential candidate for the development of a low-cost, yet reliable and efficient electrochemical portable sensor for the low-level detection of this antimycobacterial drug in biological samples.

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Authors
Couto, R., & Quinaz, M.
Affiliations
Universidade do Porto (PT)
Corresponding author
Quinaz, Maria
Venue
Sensors
Publisher
MDPI AG
Published
2016-06-30
Volume
16
Issue
7
Pages
1015
ISSN
1424-8220 (ISSN-L)
OpenAlex
W2460692629
Cited by
28
References
46
Citations by year
2026: 4 · 2025: 1 · 2024: 2 · 2023: 5 · 2022: 2 · 2021: 4 · 2020: 1 · 2019: 5 · 2018: 1 · 2017: 3
FWCI
1.38
Type
journal article
Language
en
Open access
Locations
  • Sensors (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • European Union (FEDER funds) (POCI/01/0145/FEDER/007265)
  • National funds (FCT/MEC, Fundação para a Ciência e Tecnologia and Ministério da Educação e Ciência) (PT2020 UID/QUI/50006/2013)
Topics
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Electrochemical sensors and biosensors
  • Physical Sciences › Chemistry › Electrochemistry › Electrochemical Analysis and Applications
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
Keywords
ethambutol, electrochemical sensor, screen-printed carbon electrode, multi-walled carbon nanotubes, Nafion, antitubercular agents, portable sensors, electrocatalysis, electrostatic interactions, low-cost biosensor
MeSH terms
Antitubercular Agents, Electrodes, Ethambutol, Fluorocarbon Polymers, Humans, Hydrogen-Ion Concentration, Oxidation-Reduction, Printing, Solutions, Nanotubes, Carbon, Electrochemical Techniques, Dielectric Spectroscopy

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