Analysis of Antioxidant Activity of Chinese Brown Rice by Fourier-Transformed Near Infrared Spectroscopy and Chemometrics

Table 2

Results of interval partial least squares (iPLS) models for predictions of antioxidant activity of brown rice.

	TPC (mg GAE/g)			DPPH (mg GAE/g)
	Selected intervals	RMSEP^a	LVs^b	Selected intervals	RMSEP	LVs
Raw data	3, 6, 8	0.179	4	2, 5, 6	0.175	6
Smoothing	3, 4, 8	0.131	5	2, 4, 6	0.188	4
D2	2, 4, 5	0.117	4	1, 3, 4	0.181	4
SNV	3, 4, 6	0.062	4	2, 3, 6	0.141	5

RMSEP: root mean squared error of prediction by the final iPLS with selected spectral intervals.
^bNumber of components of the final iPLS models including all the selected spectral intervals.