Free sulphite determination in wine using screen-printed carbon electrodes with prior gas-diffusion microextraction |
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| Institution: | 1. LAQV-REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, s/n, 4169-007 Porto, Portugal;2. Charles University in Prague, Faculty of Science, University Research Centre UNCE “Supramolecular Chemistry”, Department of Analytical Chemistry, UNESCO Laboratory of Environmental Electrochemistry, Hlavova 2030/8, 12843 Prague 2, Czech Republic;1. Trace Analysis and Biosensor Research Center, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand;2. Center of Excellence for Innovation in Chemistry, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand;3. Department of Chemistry, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand;4. Department of Physics, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand |
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| Abstract: | Gas-diffusion microextraction was employed in the extraction of sulphites in wines aiming their electrochemical determination, which was achieved by square-wave voltammetry using screen-printed carbon electrodes. Sulphites are additives commonly used in many produced goods, particularly food products. The developed methodology showed good limits of detection (0.4 mg L− 1) and quantification (1.3 mg L− 1). The proposed method was also compared with the reference methodology used by the wine industry (the Ripper method, an iodometry) showing no significant differences in the obtained results. Therefore, a simple, cheap and portable alternative for the determination of sulphites in wine is presented. |
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