Near-Infrared Spectroscopy as a Process Analytical Technology Tool for Monitoring the Steaming Process of Gastrodiae rhizoma with Multiparameters and Chemometrics

Table 5

Results of different models for predicting gastrodin, p-hydroxybenzyl alcohol, parishin B, and parishin A.

Parameters	Methods	PCs	Calibration		Validation
			Rc^2	RMSEC	Rp^2	RMSEP
Gastrodin	SMLR	2	0.5163	0.0475	0.6505	0.0513
	si-PLS	9	0.9625	0.0151	0.9591	0.0181
	Full-PLS	8	0.9112	0.1019	0.9088	0.1026
p-Hydroxybenzyl alcohol	SMLR	6	0.7959	0.0277	0.8472	0.0210
	si-PLS	9	0.9587	0.0130	0.9307	0.0143
	Full-PLS	7	0.8775	0.0148	0.8622	0.0154
Parishin B	SMLR	5	0.8903	0.0128	0.8219	0.0112
	si-PLS	9	0.9431	0.0101	0.9309	0.0132
	Full-PLS	8	0.9154	0.0198	0.9025	0.0215
Parishin A	SMLR	5	0.5720	0.0482	0.5234	0.0558
	si-PLS	9	0.9542	0.0176	0.9277	0.0244
	Full-PLS	6	0.9235	0.0365	0.9354	0.0422