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

Table 1

Main methodology parameters and calibration curves of the reference HPLC method.

Analytes	Linearity ranges (mg/mL)	Calibration curves	R^2	Repeatability (RSD %, n = 6)	Recovery (%, n = 6)
Gastrodin	0.0024–0.1478	Y = 780.37X – 4.1049	0.9999	0.23	99.8
p-Hydroxybenzyl alcohol	0.0055–0.0825	Y = 3112.3X – 5.5707	0.9999	0.15	100.5
Parishin B	0.0015–0.0300	Y = 7095X – 9.9625	0.9997	0.09	101.2
Parishin A	0.0016–0.1260	Y = 1478X + 6.6621	0.9998	0.12	98.6