SB-ATR FTIR Spectroscopic Monitoring of Free Fatty Acids in Commercially Available Nigella sativa (Kalonji) Oil

Table 1

Prediction capabilities of PLS—FTIR measurement model for the determination of FFA.

Spectral region	1727–1690 cm^−1
Factors	4
Validation standards	3
RMSEC	0.449
RMSECV	2.265
RMSEP	0.324
𝑅^2	0.9993

𝑅² is correlation coefficient of actual and calculated values of free fatty acids concentration in the calibration set; RMSEC: root mean square error of calibration; RMSECV: root mean square error of cross-validation; RMSEP: root mean square error of prediction.