FTIR Spectroscopy Combined with Partial Least Square for Analysis of Red Fruit Oil in Ternary Mixture System

Table 3

The statistical parameters using PLS calibration at frequency region of 4000–650 cm⁻¹ for determination of red fruit oil (RFO), corn oil (CO), and soybean oil (SO) in ternary mixture systems∗.

Analytes	Spectral treatments	Factors	Calibration performance
			𝑅^2	RMSEC
RFO	Normal	3	0.9793	1.7670
	1st derivative	4	0.9863	1.5877
	2nd derivative	5	0.9804	1.668
CO	Normal	8	0.8652	2.0214
	1st derivative	2	0.0437	3.3432
	2nd derivative	8	0.9276	1.7165
SO	Normal	9	0.9100	2.3553
	1st derivative	7	0.9545	1.8015
	2nd derivative	8	0.9693	1.6007

∗Spectral treatments selected for quantifications are marked with italics.