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

Table 4

Results with berberine of NIR spectra pretreatment methods.

Pretreatment	R^2	RMSEC (%)	RMSEP (%)
MSC + spectrum + NS	0.9523	1.1030	1.2841
MSC + 1stD + NS	0.9484	1.3150	1.6901
MSC + 2stD + NS	0.9994	0.0676	0.0764
MSC + spectrum + S-G	0.9507	1.0147	1.6187
MSC + 1stD + S-G	0.9499	1.3148	1.6515
MSC + 2stD + S-G	0.9430	1.3158	1.6913
MSC + 1stD + ND	0.8841	2.0221	2.1980
MSC + 2stD + ND	0.9644	1.0125	1.0160
SNV + spectrum + NS	0.9516	1.2450	1.4714
SNV + +1stD + NS	0.9463	1.3153	1.7031
SNV + 2stD + NS	0.9812	0.9651	0.0970
SNV + spectrum + S-G	0.9498	1.4081	1.7017
SNV + 1stD + S-G	0.9494	1.3481	1.6107
SNV + 2stD + S-G	0.9422	1.2857	1.6006
SNV + 1stD + ND	0.8840	2.0221	2.1970
SNV + 2stD + ND	0.9609	1.0131	1.0167