Abstract
We describe the application of square wave voltammetry at ultramicroelectrodes for the determination of natural antioxidants (α, δ, and γ tocopherols), and tert-butyl hydroxytoluene in edible vegetable oils.Tocopherol determinations were performed in benzene/ethanol (1:2)+0.1molL−1 H2SO4+oil samples at a carbon fiber disk ultramicroelectrode, and tert-butyl hydroxytoluene was determined in acetonitrile (ACN)+0.1molL−1 (C4H9)4NF6P at a Pt band ultramicroelectrode after performing its extraction from the oil sample with ACN.Recovery percentages determined by the standard additions method were in the range from 92% to 102%, with variation coefficients between 0.5% and 4%.Antioxidant concentrations calculated by this methodology were in good agreement with those values declared by the manufacturers.
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