Laser-pyrolyzed electrochemical paper-based analytical sensor for sulphite analysis

Author(s)

Martins, Alisson Bezerra ^[1] ; Lobato, Alnilan ^[1] ; Tasic, Nikola ^[1] ; Perez-Sanz, Fernando J. ^[1] ; Vidinha, Pedro ^[1] ; Paixao, Thiago R. L. C. ^[1] ; Goncalves, Luis Moreira ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: Electrochemistry Communications; v. 107, OCT 2019.
• Web of Science Citations: 0

Abstract

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 Omega 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. (AU)

• FAPESP's process: 14/50279-4 - Brasil Research Centre for Gas Innovation
• Grantee: Julio Romano Meneghini
• Support Opportunities: Research Grants - Research Centers in Engineering Program
• FAPESP's process: 18/20745-4 - Study of the increased faradaic signal with paper-based electrodes
• Grantee: Alisson Feliphe Bezerra Martins
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 19/11214-8 - Application of capillary electrophoresis for the determination of aldehydes after extraction by GDME-MIPs
• Grantee: Alnilan Cristina Barros Lobato
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 18/13922-7 - Development of a point-of-care biosensor for the swift determination of D-Dimers
• Grantee: Nikola Tasic
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 17/10522-5 - Development of alternative methods for fabrication of electrochemical paper-based sensors
• Grantee: Thiago Regis Longo Cesar da Paixão
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/14425-7 - A new synergetic path for gas-diffusion microextraction (GDME) making use of molecular imprinted polymers (MIPs)
• Grantee: Luís Francisco Moreira Gonçalves
• Support Opportunities: Research Grants - Young Investigators Grants