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

Table 5

Results with dehydrocorydaline of NIR spectra pretreatment methods.

Pretreatment	R^2	RMSEC (%)	RMSEP (%)
MSC + spectrum + NS	0.8949	1.9410	1.9641
MSC + 1stD + NS	0.9605	1.0088	1.0132
MSC + 2stD + NS	0.9872	0.6930	0.8810
MSC + spectrum + S-G	0.8900	1.9144	1.9166
MSC + 1stD + S-G	0.9698	1.0077	1.1204
MSC + 2stD + S-G	0.9692	1.0079	1.1205
MSC + 1stD + ND	0.9362	1.6111	1.7137
MSC + 2stD + ND	0.9451	1.4103	1.4021
SNV + spectrum + NS	0.8919	1.9143	1.9156
SNV + 1stD + NS	0.9607	1.0088	1.0131
SNV + 2stD + NS	0.9828	0.9878	0.9055
SNV + spectrum + S-G	0.8863	2.1460	2.1583
SNV + 1stD + S-G	0.9622	1.0085	1.3018
SNV + 2stD + S-G	0.9693	1.0078	1.2005
SNV + 1stD + ND	0.9362	1.6111	1.7136
SNV + 2stD + ND	0.9458	1.4102	1.5140