Near-Infrared Spectroscopy as an Analytical Process Technology for the On-Line Quantification of Water Precipitation Processes during Danhong Injection
Table 3
Parameters for the PLSR models with different spectral pretreatment methods.
Pretreatments
RMSEC (mg/mL)
RMSECV (mg/mL)
DSS
PA
RA
SAB
DSS
PA
RA
SAB
DSS
PA
RA
SAB
Raw spectra
98.08
97.81
97.76
95.97
0.0642
0.0141
0.0312
0.177
0.0684
0.0150
0.0333
0.1886
SLS
87.26
88.99
89.22
91.15
0.1540
0.0341
0.0716
0.263
0.1619
0.0356
0.0748
0.2765
VN
97.61
97.64
97.57
95.86
0.0716
0.0147
0.0340
0.180
0.0763
0.0157
0.0363
0.1905
1st Der
98.20
98.14
98.06
96.10
0.0619
0.0130
0.0304
0.174
0.0651
0.0137
0.0320
0.1806
2nd Der
81.38
80.63
83.88
85.45
0.2000
0.0420
0.0876
0.337
0.2024
0.0425
0.0887
0.3411
1st Der + SLS
89.20
89.58
90.79
88.84
0.1520
0.0308
0.0662
0.295
0.1577
0.0320
0.0687
0.3042
SLS: straight line subtraction. VN: vector normalization. 1st Der: first derivative. 2nd Der: second derivative. : coefficient of determination. RMSECV: root mean squares error of the cross-validation. RMSEC: root mean square error of the calibration.
