Three synthetic phenolic antioxidants, butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT)
and tert-butyl hydroquinone (TBHQ), were determined in different edible vegetable oil samples. The analyses
were carried out by gas chromatography–mass spectrometry (GC–MS) using microvial insert large
volume injection (LVI). Several parameters affecting this sample introduction step, such as temperatures,
times and gas flows, were optimised. Quantification was carried out by the matrix-matched calibration
method using carvacrol as internal standard, providing quantification limits between 0.08 and
0.10 ng g–1, depending on the compound. The three phenolic compounds were detected in several of
the samples, BHT being the most frequently found. Recovery assays for oil samples spiked at two concentration
levels, 2.5 and 10 ng g–1, provided recoveries in the 86–115% range.