RT Journal Article
T1 An electrochemical alternative for evaluating the antioxidant capacity in walnut kernel extracts.
A1 Ruiz-Caro, Pablo
A1 Espada-Bellido, Estrella
A1 Garcia-Guzman, Juan Jose
A1 Bellido-Milla, Dolores
A1 Vazquez-Gonzalez, Marcos
A1 Cubillana-Aguilera, Laura
A1 Palacios-Santander, Jose Maria
K1 Antioxidant capacity
K1 Electrochemical index approach
K1 Flavonoids
K1 Phenolic acids
K1 Sonogel-carbon electrode
K1 Walnuts
AB A fast, precise and inexpensive alternative for evaluating the antioxidant activity (AA) in walnut kernel extracts is proposed. Traditional ABTS assay and an electrochemical index approach have been applied to evaluate the AA in walnuts. A fast and efficient defatting of the walnuts by ultrasound assisted extraction (UAE) was carried out. Later, for the extraction of polyphenolic compounds, a procedure based on UAE in ethanolic medium was used. The AA of the sample ethanolic extracts was expressed as both % of inhibition by the ABTS spectrophotometric method and the electrochemical index approach (EI) obtained by the ratio between current and potential peak values using differential pulse voltammetry (DPV) at a Sonogel-Carbon electrode. The behaviour of the EI approach have been explored using six polyphenols standards and walnut kernel extracts at pH 2. All the polyphenols appeared at an oxidation potential between 0.476 and 0.778 V. Eleven samples available to consumers were analysed. A high significant correlation (R2 = 0.927) between the spectrophotometric measurements and the EI approach of the walnut extracts was obtained.
PB Elsevier
YR 2022
FD 2022-06-04
LK http://hdl.handle.net/10668/22233
UL http://hdl.handle.net/10668/22233
LA en
NO Ruiz-Caro P, Espada-Bellido E, García-Guzmán JJ, Bellido-Milla D, Vázquez-González M, Cubillana-Aguilera L, et al. An electrochemical alternative for evaluating the antioxidant capacity in walnut kernel extracts. Food Chem. 2022 Nov 1;393:133417
DS RISalud
RD Apr 15, 2025