Antioxidant activity of Sacha Inchi oil ( Plukenetia volubilis ): Electrochemical determination in a Non-Aqueous medium

Abstract

An adaptation of the DPPH and ABTS assays, commonly used in UV-Vis, to electrochemical techniques is presented as an analytical tool for determining antioxidant activity in non-aqueous media of a commercial Sacha Inchi oil of Amazonian origin. The results obtained through cyclic voltammetry and square wave voltammetry demonstrate that the proposed methodology allows for the determination of antioxidant capacity equivalent to Trolox (TEAC), using tetrafluoroborate of tetrabutylammonium and lithium perchlorate in isopropyl alcohol as supporting electrolytes. In addition, in the ABTS assay, the analysis time is reduced due to the in situ generation of the ABTS•+ radical through electrochemical oxidation. The results confirm that the commercial Amazonian Sacha Inchi oil exhibits antioxidant activity.