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

Table 3

Results with palmatine chloride of NIR spectra pretreatment methods.

Pretreatment	R^2	RMSEC (%)	RMSEP (%)
MSC + spectrum + NS	0.9451	1.3825	1.4038
MSC + 1stD + NS	0.9696	1.1018	1.3127
MSC + 2stD + NS	0.9959	0.4136	0.6458
MSC + spectrum + S-G	0.9438	1.3215	1.3924
MSC + 1stD + S-G	0.9697	1.1816	1.3327
MSC + 2stD + S-G	0.9027	1.8932	2.0041
MSC + 1stD + ND	0.9502	1.2400	1.4015
MSC + 2stD + ND	0.9569	1.2322	1.3898
SNV + spectrum + NS	0.9449	1.2538	1.3507
SNV + 1stD + NS	0.9694	1.1090	1.4316
SNV + 2stD + NS	0.9826	1.0015	1.0194
SNV + spectrum + S-G	0.9433	1.2375	1.3646
SNV + 1stD + S-G	0.9696	1.1083	1.3258
SNV + 2stD + S-G	0.9025	1.9032	2.0040
SNV + 1stD + ND	0.9498	1.3225	1.6090
SNV + 2stD + ND	0.9566	1.1237	1.3905