Improving the Classification Accuracy for Near-Infrared Spectroscopy of Chinese Salvia miltiorrhiza Using Local Variable Selection

Table 2

Position and assignment of the main absorption bands observed in the region between 10,000 and 4000 cm⁻¹.

NIR band position (cm^−1)	Remark (assignments)
4200∼4400	Combination bands of C–H
4600∼4700	Combination bands of C=O and N–H stretching
5000∼5200	Combination bands of O–H and N–H
5900∼6100	The first overtone of C–H
7200∼7000	The first overtone of O–H
8100∼8300	The second overtone of C–H in CH2