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Table 2 Results of PLS1 calibration and prediction models for the quantitative compositional analysis of bamboo using pretreated visible–near infrared spectra

From: Rapid determination of chemical composition and classification of bamboo fractions using visible–near infrared spectroscopy coupled with multivariate data analysis

Pretreatment Chemical composition Factors R2 c RMSEC R2 p RMSEP SD RPD RER
MSC Cellulose 10 0.958 2.1 0.925 2.8 10.0 3.6 11.8
Xylan 3 0.947 1.9 0.931 2.2 8.1 3.7 12.2
Lignin 8 0.972 1.5 0.939 2.2 8.8 4.1 13.3
Glucose 16 0.998 0.7 0.986 2.2 18.2 8.4 26.4
Xylose 14 0.998 1.3 0.974 3.8 23.7 6.3 17.5
EMSC Cellulose 10 0.964 1.9 0.935 2.6 10.1 3.9 12.5
Xylan 3 0.953 1.8 0.937 2.1 8.2 3.9 13.0
Lignin 7 0.964 1.7 0.943 2.1 8.7 4.2 13.3
Glucose 16 0.998 0.4 0.992 1.6 18.2 11.2 37.7
Xylose 14 0.998 1.1 0.980 3.3 23.7 7.3 20.5
SNV Cellulose 5 0.910 3.0 0.874 3.6 9.8 2.7 7.9
Xylan 4 0.955 1.8 0.935 2.1 8.2 3.9 13.3
Lignin 8 0.974 1.4 0.949 2.0 8.8 4.3 13.8
Glucose 15 0.996 1.1 0.974 2.9 18.2 6.3 21.0
Xylose 15 0.998 1.0 0.980 3.3 23.7 7.2 20.0
First derivative Cellulose 8 0.994 0.8 0.990 1.0 10.2 10.1 35.2
Xylan 7 0.990 0.8 0.982 1.1 8.3 7.7 25.2
Lignin 7 0.988 1.0 0.980 1.2 8.8 7.2 22.7
Glucose 9 0.998 0.6 0.996 1.1 18.2 16.1 52.6
Xylose 7 0.998 1.1 0.994 1.8 23.7 13.0 34.3
Second derivative Cellulose 7 0.988 1.1 0.976 1.5 10.2 6.6 20.3
Xylan 7 0.990 0.8 0.984 1.0 8.3 8.1 29.0
Lignin 10 0.996 0.5 0.994 0.7 8.9 13.7 36.6
Glucose 8 0.998 0.7 0.996 1.1 18.2 16.8 51.8
Xylose 7 0.996 1.4 0.992 2.0 23.7 11.7 32.5
  1. R 2 c square of the correlation coefficient for calibration, RMSEC root mean square error of calibration, R 2 p square of the correlation coefficient for prediction, RMSEP root mean square error of prediction, SD standard deviation, RPD ratio of root mean square error of prediction to standard deviation, RER range error ratio. MSC multiplicative scattering correction, EMSC extensive multiplicative scattering correction, SNV standard normalized variate. The number of samples used for quantitative analysis of cellulose, xylan, and lignin is 36. The number of samples used for quantitative analysis of glucose and xylose is 26