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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Marlin, Cibely S. [1] ; Maximino, Mateus D. [1] ; Pereira, Matheus S. [1] ; Alessio, Priscila [1]
Total Authors: 4
[1] Sao Paulo State Univ UNESP, Sch Technol & Appl Sci, BR-19060080 Presidente Prudente, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: IEEE SENSORS JOURNAL; v. 19, n. 22, p. 10686-10692, NOV 15 2019.
Web of Science Citations: 0

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)

FAPESP's process: 17/15019-0 - Combination of confocal fluorescence microscopy and surface-enhanced Raman scattering techniques: interaction, detection, and quantification of molecules of interest in biomimetic system.
Grantee:Cibely da Silva Martin Sonvesso
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 17/06534-8 - Impact of Emerging Pollutants in Health: a Study on Biomimetic Membranes
Grantee:Priscila Alessio Constantino
Support type: Regular Research Grants