RT journal article
T1 Assessment of the Polyphenol Indices and Antioxidant Capacity for Beers and Wines Using a Tyrosinase-Based Biosensor Prepared by Sinusoidal Current Method
A1 García Guzmán, Juan José
A1 López-Iglesias, David
A1 Cubillana Aguilera, Laura
A1 Lete, Cecilia
A1 Lupu, Stelian
A1 Palacios Santander, José María
A1 Bellido Milla, Dolores
A2 Química Analítica
K1 sonogel–carbon based biosensor
K1 sinusoidal current method
K1 polyphenol index
K1 antioxidant capacity
K1 beer and wine
AB The application of a novel Poly(3,4-ethylenedioxythiophene)-Tyrosinase/Sonogel-Carbonelectrode (PEDOT-Tyr/SNGC) biosensor to beers and wines analysis is proposed. This biosensorimplies a new Sinusoidal Current (SC) electrodeposition method to immobilize the enzymegenerating a nanostructure surface. The biosensors were characterized electrochemically, employingcyclic voltammetry and electrochemical impedance spectroscopy. Sensitivity, limit of detection,and correlation coefficients of the linear fitting were 2.40   104  A  M1, 4.33  M, and R2 = 0.9987,respectively. Caffeic acid is used as the reference polyphenol. A sampling of nine beers (four lager,three stout, and two non-alcoholic beers), and four wines (three red and one white wine) purchasedin a local store was performed. The Polyphenol indeces for beers and wines have been assessedusing the proposed biosensor, and the obtained values are in agreement with the literature data.Antioxidant properties of the samples using the 2,20-azino-bis(3-ethylbenzothiazoline-6-sulphonicacid (ABTS) radical spectrophotometric method were also evaluated. The correlation between thepolyphenol index and the antioxidant capacity was obtained for beers and wines.
PB MDPI
SN 1424-8220
YR 2019
FD 2019-01
LK http://hdl.handle.net/10498/21340
UL http://hdl.handle.net/10498/21340
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 06-nov-2026