| Autor: |
Alisson Bezerra Martins, Alnilan Lobato, Nikola Tasić, Fernando J. Perez-Sanz, Pedro Vidinha, Thiago R.L.C. Paixão, Luís Moreira Gonçalves |
| Jazyk: |
angličtina |
| Rok vydání: |
2019 |
| Předmět: |
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| Zdroj: |
Electrochemistry Communications, Vol 107, Iss , Pp - (2019) |
| Druh dokumentu: |
article |
| ISSN: |
1388-2481 |
| DOI: |
10.1016/j.elecom.2019.106541 |
| Popis: |
A CO2 laser can be used to pyrolyze the surface of common paperboard to produce a conductive carbon material for subsequent use as an electrode for general electrochemical measurements. In this work, a laser-pyrolyzed electrochemical paper-based analytical device (LP-ePAD) of this type was combined with a gas-diffusion microextraction (GDME) unit for the square-wave voltammetric analysis of sulphites in commercial beverages. The fabricated LP-ePAD had a resistivity at room temperature of 11 ± 4 Ω per square electrical sheet (measured with a four-point probe system). The developed methodology showed a limit of detection of 1 mg L−1 for sulphite analysis, with good repeatability and reproducibility (coefficient of variation below 7%), as well having as the desirable qualities of portability and low price. Keywords: Electroanalysis, Food quality, Sample preparation, Laser scribed paper-based analytical devices, Square-wave voltammetry, Volatile extraction |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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Full Text from ScienceDirect