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

Table 3

Reference results of samples in calibration and validation sets.

Parameters	Units	Subsets	S.N	Range	Mean	S.D
Gastrodin	%	Calibration set	156	0.20–0.53	0.32	8.1
		Validation set	40	0.18–0.54	0.35	7.9
p-Hydroxybenzyl alcohol	%	Calibration set	156	0.10–0.34	0.25	2.5
		Validation set	40	0.12–0.32	0.23	2.9
Parishin B	%	Calibration set	156	0.03–0.25	0.12	1.9
		Validation set	40	0.05–0.21	0.14	1.8
Parishin A	%	Calibration set	156	0.20–0.54	0.39	2.0
		Validation set	40	0.21–0.53	0.38	2.5
Moisture	%	Calibration set	156	65.03–89.12	78.15	5.6
		Validation set	40	66.43–88.15	76.43	6.2

S.N, the number of samples; S.D, standard deviation.