Table 1 Results of PLS/MIR calibration models for the determination of ethanol in fermented alcoholic beverages
Pre-treatment | PLS component | Calibration | Validation | ||
|---|---|---|---|---|---|
RMSEE | R2 | RMSEP | R2 | ||
Raw data | 6 | 0.004 | 0.999 | 0.1 | 0.998 |
Sub min + 1st derivative | 9 | 0.0001 | 0.999 | 0.09 | 0.999 |
Sub min + 2nd derivative | 6 | 0.0008 | 0.999 | 0.1 | 0.999 |
Sub min + mean centering | 7 | 0.002 | 0.999 | 0.09 | 0.999 |
Sub min + normalization + mean centering | 7 | 0.01 | 0.999 | 0.5 | 0.991 |
Sub min + normalization + 1st derivative | 8 | 0.004 | 0.999 | 0.3 | 0.989 |
Sub min + normalization + 2nd derivative | 8 | 0.004 | 0.999 | 0.3 | 0.989 |