Abstract
This study describes the use of electrochemical paper-based analytical devices (ePADs) drawn with graphite pencil for the determination of ascorbic acid (AA) in commercial tablets. ePADs were fabricated using vegetal paper and graphite pencil. First, the three-electrode electrochemical cell drawn using a graphical software and toner lines were laser printed on the vegetal paper surface to delimit the electrode areas. Then, the electrode regions were manually painted with graphite pencil. Afterwards, the pseudo-reference electrode was defined with the deposition of silver ink over the graphite surface. Cyclic voltammetry and square wave voltammetry (SWV) experiments were performed to optimize the electroanalytical parameters as well as to quantitatively determine the AA concentration in two commercial tables. ePADs exhibited linear behavior for a concentration range between 0.5 and 3.0 mmol L−1. The achieved limit of detection and sensitivity were 70 μmol L−1 and 0.47 μA/mmol L−1, respectively. The AA concentration levels found by SWV experiments in both CenevitTM and Energil CTM were 2.80 ± 0.02 and 3.10 ± 0.01 mmol L−1, respectively. The accuracy of the proposed devices was investigated through recovery experiments in three concentration levels and it presented values between 95 and 115%.
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Acknowledgments
This project was supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (grant 448089/2014-9). Coordenaçao de Aperfeiçoamento de Pessoal de Nível Superior (CAPES). Fundaçao de Amparo à Pesquisa do Estado de Goiás (FAPEG) and Institute Nacional de Ciência e Tecnologia de Bioanalítica (INCTBio). CAPES and CNPq are also acknowledged for the scholarships and researcher fellowship (grant 308140/2016-8) granted to the authors.
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Oliveira, V.X.G., Dias, A.A., Carvalho, L.L. et al. Determination of Ascorbic Acid in Commercial Tablets Using Pencil Drawn Electrochemical Paper-based Analytical Devices. ANAL. SCI. 34, 91–95 (2018). https://doi.org/10.2116/analsci.34.91
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DOI: https://doi.org/10.2116/analsci.34.91