Potential Use of FTIR-ATR Spectroscopic Method for Determination of Virgin Coconut Oil and Extra Virgin Olive Oil in Ternary Mixture Systems |
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Authors: | Abdul Rohman Yaakob B Che Man |
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Affiliation: | (1) Halal Products Research Institute, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia;(2) Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Gadjah Mada University, Yogyakarta, 55281, Indonesia;(3) Department of Food Technology, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia |
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Abstract: | The aim of this study was to investigate the feasibility of Fourier-transform infrared (FTIR) spectroscopy combined with multivariate
calibrations of partial least square (PLS) and principle component regression (PCR) for analysis of virgin coconut oil (VCO)
in the ternary mixture with palm oil (PO) and olive oil, and for analysis of extra virgin olive oil (EVOO) mixed with soybean
oil (SO) and corn oil (CO). The spectra of individual oils and their blends with certain concentrations were scanned using
horizontal attenuated total reflectance accessory at mid-infrared region of 4,000–650 cm−1. The optimal frequency regions selected for calibration models were based on its ability to give the highest values of coefficient
of determination (R
2) and the lowest values of root mean standard error of calibration (RMSEC). PLS was slightly better for quantitative analysis
of VCO and EVOO compared with PCR. VCO in ternary mixtures is successfully determined at frequency region of 1,200–1,000 using
second derivative FTIR spectra with R
2 and RMSEC values of 0.999 and 0.200, respectively. Meanwhile, EVOO is best determined at 1,200–1,000 using first derivative
FTIR spectra with R
2 and RMSEC values of 0.999 and 0.975, respectively. The results showed that FTIR spectroscopy offers accurate and reliable
technique for quantitative analysis of VCO and EVOO in ternary systems. In addition, the developed method can be used for
the monitoring of VCO and EVOO adulteration with cheaper oils like PO in VCO as well as SO and CO in EVOO. |
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Keywords: | |
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