Determination of quaternary, ternary, and binary mixtures and single determination of butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), tert-butylhydroquinone (TBHQ), and nordihydroguaiaretic acid (NDGA) have been made by using a partial least-squares (PLS) model.
A calibration set containing between 2 to 80 μg mL-1 of BHA, TBHQ, and NDGA and 10 to 200 μg mL-1 of BHT was used, and a model was optimized by using a cross-validation process. Relative standard deviation values between 0.1 and 2.1% for BHA, between 0.2 and 2.1%
for BHT, between 0.4 and 8.3% for NDGA, and between 1.2 and 1.3 for TBHQ were calculated. The resolution of quaternary mixtures was tested in sunflower oil samples.
Department of Analytical Chemistry, University of Extremadura, 06071 Badajoz, Spain 2:
Department of Analytical Chemistry, University of Granada, 18071 Granada, Spain
Publication date: April 1, 1996
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