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. 2023 Feb 9;28(4):1681. doi: 10.3390/molecules28041681

Table 2.

Prediction of vitamin C (mg/100 g) in citrus peel by PLS model using full 375 wavelengths.

Spectra Model Number of LV Calibration Cross-Validation Prediction ΔE
r C RMSEC r CV RMSECV r P RMSEP RPD
RAW RAW-PLS 1 13 0.957 13.077 0.930 15.703 0.928 16.343 3.537 3.266
SGS SGS-PLS 2 14 0.971 11.314 0.934 15.235 0.926 16.319 3.542 5.005
NC NC-PLS 3 14 0.974 10.674 0.953 13.174 0.956 13.798 4.189 3.124
MSC MSC-PLS 4 14 0.974 10.671 0.932 15.499 0.918 16.428 3.518 5.757
1st Der 1st Der-PLS 5 8 0.944 13.170 0.889 17.907 0.877 18.114 3.191 4.944
2nd Der 2nd Der-PLS 6 5 0.915 18.949 0.892 21.566 0.881 22.335 2.588 3.386
BC BC-PLS 7 12 0.950 14.237 0.906 20.135 0.913 20.253 2.854 6.016
SNV SNV-PLS 8 11 0.947 14.611 0.894 21.421 0.887 23.916 2.417 9.305
MCT MCT-PLS 9 13 0.957 13.077 0.910 20.703 0.893 21.744 2.658 8.667

1 PLS model built with raw spectra; 2 PLS model built with SGS spectra; 3 PLS model built with NC spectra; 4 PLS model built with MSC spectra; 5 PLS model built with 1st Der spectra; 6 PLS model built with 2nd Der spectra; 7 PLS model built with BC spectra; 8 PLS model built with SNV spectra; 9 PLS model built with MCT spectra.