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

Table 8

Results with corydaline of NIR spectra pretreatment methods.

Pretreatment	R^2	RMSEC (%)	RMSEP (%)
MSC + spectrum + NS	0.8614	2.5207	2.5157
MSC + 1stD + NS	0.9521	1.1125	1.1152
MSC + 2stD + NS	0.9918	0.5510	0.7230
MSC + spectrum + S-G	0.8599	2.6209	2.5798
MSC + 1stD + S-G	0.8928	2.0184	2.0168
MSC + 2stD + S-G	0.9534	1.1123	1.0153
MSC + 1stD + ND	0.8793	2.3950	2.3187
MSC + 2stD + ND	0.8368	2.7224	2.7701
SNV + spectrum + NS	0.8628	2.4207	2.4149
SNV + 1stD + NS	0.9521	1.2125	1.3153
SNV + 2stD + NS	0.9674	1.1089	1.1077
SNV + spectrum + S-G	0.7894	3.0251	3.0181
SNV + 1stD + S-G	0.8935	2.0183	2.0169
SNV + 2stD + S-G	0.9536	1.1230	1.1528
SNV + 1stD + ND	0.8795	2.3194	2.2887
SNV + 2stD + ND	0.8178	2.8935	2.8897