An electrochemical alternative for evaluating the antioxidant capacity in walnut kernel extracts.

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URI: http://hdl.handle.net/10498/27044
DOI: 10.1016/j.foodchem.2022.133417
ISSN: 1873-7072
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2022-06Department
Química AnalíticaSource
Food Chemistry 393 (2022) 133417Abstract
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.
Subjects
Walnuts Phenolic acids Flavonoids Sonogel-carbon electrode Electrochemical index approach Antioxidant capacity; Walnuts; Phenolic acids; Flavonoids; Sonogel-carbon electrode; Electrochemical index approach; Antioxidant capacityCollections
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