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

Figure 4

Correlation coefficient scatter plots of actual measured values and NIR predictions for protopine (a), palmatine chloride (b), berberine (c), dehydrocorydaline (d), tetrahydropalmatine (e), tetrahydroberberine (f), and corydaline (g).

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(b)

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(e)

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(g)