Currently, the authentication of virgin coconut oil (VCO) has become very important due to the possible
adulteration of VCO with cheaper plant oils such as corn (CO) and sunflower (SFO) oils. Methods involving
Fourier transform mid infrared (FT-MIR) spectroscopy combined with chemometrics techniques (partial
least square (PLS) and discriminant analysis (DA)) were developed for quantification and classification of
CO and SFO in VCO. MIR spectra of oil samples were recorded at frequency regions of 4000–650 cm1 on
horizontal attenuated total reflectance (HATR) attachment of FTIR. DA can successfully classify VCO and
that adulterated with CO and SFO using 10 principal components. Furthermore, PLS model correlates the
actual and FTIR estimated values of oil adulterants (CO and SFO) with coefficient of determination (R2
) of 0.999.