Polyphenol Detection in Mate Tea Samples Using Iron Tetrasulfonated Phthalocyanine Modified Screen-Printed Electrode

Autor(es)

Marlin, Cibely S. ^[1] ; Maximino, Mateus D. ^[1] ; Pereira, Matheus S. ^[1] ; Alessio, Priscila ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Sch Technol & Appl Sci, BR-19060080 Presidente Prudente, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: IEEE SENSORS JOURNAL; v. 19, n. 22, p. 10686-10692, NOV 15 2019.
• Citações Web of Science: 0

Resumo

Fast, inexpensive, and efficient methods to determine polyphenols content are of interest to the food industry. Here, we propose an easy and fast sensor for the determination of polyphenol content in tea samples from a green and roasted mate. The screen-printed carbon electrodes (SPCEs) were modified with iron tetrasulfonated phthalocyanine (FeTsPc) solutions prepared at different pHs (2.5, 6.0, and 9.0). The modification in different pHs showed only small changes on catechol oxidation. However, all modified electrodes decreased the oxidation potential of catechol in comparison with unmodified SPCE. The SPCE/FeTsPc was evaluated as a sensor in catechol standard solution, showing a limit of detection and quantification of 0.6 and 2.0 mu mol/L, respectively. The determination of polyphenols in the tea samples is in agreement with the Folin-Ciocalteu method; both methods used catechol as standard. The statistics results indicate SPCE modified with FeTsPc showed a high level of confidence to the application as a sensor for polyphenol content in mate tea samples. (AU)

• Processo FAPESP: 17/15019-0 - Combinação das técnicas de microscopia de fluorescência confocal e espalhamento micro-Raman amplificado em superfície (SERS): interação, detecção e quantificação de moléculas de interesse em sistemas biomiméticos.
• Beneficiário: Cibely da Silva Martin Sonvesso
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/06534-8 - O Impacto de Poluentes Emergentes na Saúde: um Estudo em Membranas Biomiméticas
• Beneficiário: Priscila Alessio Constantino
• Modalidade de apoio: Auxílio à Pesquisa - Regular