Table 1 Results of PLS1 calibration and prediction models for the quantitative compositional analysis of bamboo using raw spectra
Wavelength (nm) | Chemical composition | Factors | R2 c | RMSEC | R2 p | RMSEP | SD | RPD | RER |
|---|---|---|---|---|---|---|---|---|---|
400–780 (n = 36) | Cellulose | 8 | 0.82 | 4.3 | 0.68 | 6.0 | 10.3 | 1.7 | 5.6 |
Xylan | 3 | 0.87 | 3.0 | 0.83 | 3.5 | 8.4 | 2.4 | 8.0 | |
Lignin | 3 | 0.83 | 3.7 | 0.78 | 4.2 | 8.9 | 2.1 | 7.1 | |
Glucose | 3 | 0.79 | 8.2 | 0.70 | 9.7 | 18.2 | 1.9 | 5.4 | |
Xylose | 10 | 0.97 | 4.3 | 0.86 | 9.0 | 23.7 | 2.6 | 8.7 | |
780–2500 (n = 36) | Cellulose | 4 | 0.88 | 3.5 | 0.82 | 4.3 | 10.3 | 2.4 | 6.5 |
Xylan | 6 | 0.93 | 2.1 | 0.88 | 2.9 | 8.4 | 2.9 | 10.0 | |
Lignin | 7 | 0.96 | 1.8 | 0.92 | 2.5 | 8.9 | 3.6 | 11.9 | |
Glucose | 7 | 0.92 | 5.1 | 0.77 | 8.6 | 18.2 | 2.1 | 7.6 | |
Xylose | 4 | 0.90 | 7.5 | 0.79 | 11.1 | 23.7 | 2.1 | 6.0 | |
400–2500 (n = 36) | Cellulose | 4 | 0.88 | 3.5 | 0.82 | 4.3 | 10.3 | 2.4 | 6.1 |
Xylan | 4 | 0.94 | 2.1 | 0.91 | 2.5 | 8.4 | 3.3 | 10.0 | |
Lignin | 7 | 0.94 | 2.2 | 0.86 | 3.3 | 8.9 | 2.7 | 8.7 | |
Glucose | 4 | 0.84 | 7.1 | 0.73 | 9.4 | 18.2 | 1.9 | 5.9 | |
Xylose | 5 | 0.87 | 8.4 | 0.75 | 11.7 | 23.7 | 2.0 | 7.0 |