Rapid Quality Identification of Decoction Pieces of Crude and Processed Corydalis Rhizoma by Near-Infrared Spectroscopy Coupled with Chemometrics

Table 1

Methodological survey of HPLC results (n = 6).

Components	Standard curve	R^2	Linear range (μg/ml)	Precision (RSD%)	Stability (RSD%)	Repeatability (RSD%)	Recovery
							Mean	(RSD%)
Protopine	Y = 108.5x − 0.1987	0.9972	17.42–52.25	1.68	1.70	1.46	98.39	1.08
Palmatine chloride	Y = 531.89x − 0.6147	0.9981	16.53–49.60	1.21	1.56	1.53	96.77	1.95
Berberine	Y = 436.4x − 0.5199	0.9984	17.03–51.10	1.08	1.67	1.23	98.18	1.53
Dehydrocorydaline	Y = 395.47x − 0.1906	0.9990	17.27–51.80	0.53	1.15	1.14	97.91	1.74
Tetrahydropalmatine	Y = 109.5x − 0.0908	0.9991	17.92–53.75	0.24	0.78	1.35	101.62	1.29
Tetrahydroberberine	Y = 111.96x − 0.2056	0.9992	20.25–60.75	0.23	0.58	0.63	99.41	0.73
Corydaline	Y = 102.92x − 0.0599	0.9990	19.15–57.45	0.27	0.34	1.51	99.04	0.86