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

Table 7

Results with tetrahydroberberine of NIR spectra pretreatment methods.

Pretreatment	R^2	RMSEC (%)	RMSEP (%)
MSC + spectrum + NS	0.9126	1.7854	018527
MSC + 1stD + NS	0.9677	1.0033	1.0037
MSC + 2stD + NS	0.9976	0.3920	0.6138
MSC + spectrum + S-G	0.9094	1.8555	1.8514
MSC + 1stD + S-G	0.9035	1.8457	1.8661
MSC + 2stD + S-G	0.9702	1.0632	1.0319
MSC + 1stD + ND	0.9228	1.8051	1.8043
MSC + 2stD + ND	0.9087	1.9055	1.8951
SNV + spectrum + NS	0.9172	1.8553	1.8543
SNV + 1stD + NS	0.9679	1.0313	1.0238
SNV + 2stD + NS	0.9760	1.0032	1.0024
SNV + spectrum + S-G	0.9138	1.7054	1.7054
SNV + 1stD + S-G	0.9033	1.9057	1.9061
SNV + 2stD + S-G	0.9704	1.0032	1.0039
SNV + 1stD + ND	0.9231	1.4051	1.4043
SNV + 2stD + ND	0.9087	1.9055	1.9052