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

Table 6

Results with tetrahydropalmatine of NIR spectra pretreatment methods.

Pretreatment	R^2	RMSEC (%)	RMSEP (%)
MSC + spectrum + NS	0.9699	1.0060	1.0114
MSC + 1stD + NS	0.9092	1.7103	1.8104
MSC + 2stD + NS	0.9981	0.1594	0.3877
MSC + spectrum + S-G	0.9616	1.0068	1.0141
MSC + 1stD + S-G	0.8969	2.0110	2.0099
MSC + 2stD + S-G	0.7512	3.0164	3.0117
MSC + 1stD + ND	0.9081	1.8910	1.8003
MSC + 2stD + ND	0.8378	2.0536	2.8911
SNV + spectrum + NS	0.9836	0.8845	0.0935
SNV + 1stD + NS	0.9137	1.0101	1.0103
SNV + 2stD + NS	0.8887	2.0114	2.0111
SNV + spectrum + S-G	0.9610	1.0069	1.0162
SNV + 1stD + S-G	0.8631	2.4033	2.3503
SNV + 2stD + S-G	0.8724	2.1201	2.0012
SNV + 1stD + ND	0.8934	1.8112	1.9187
SNV + 2stD + ND	0.8724	2.6121	2.7184