3.3. FTIR ATR analysis
Simultaneous with Raman measurements, single reflection ATR spectra of the same milk samples were recorded (two sets of milk IR spectra, raw and after water spectrum subtraction, are shown in Figs. S6 and S7 of supplementary material, respectively). Applying methodology analogous to that used during Raman data analysis, PLS modelling was performed (calibration curves and relative errors plots for milk constituents were shown in Fig. S8 of supplementary material). The following spectral ranges were utilised: 800–1017, 1063–1634 and 1732–1760 cm−1. Correlation coefficient values determined on the basis of ATR data varied from 0.991 to 0.995, while RSEP errors were 1.9–3.3% and 1.9–3.5% for calibration and validation samples, respectively. Representative results for the ATR PLS modelling are shown in Table 1. Quantitative analyses of commercial samples resulted in the RSEPtest error values of 2.4–4.4% (Fig. 4).
3.3. FTIR ATR analysisSimultaneous with Raman measurements, single reflection ATR spectra of the same milk samples were recorded (two sets of milk IR spectra, raw and after water spectrum subtraction, are shown in Figs. S6 and S7 of supplementary material, respectively). Applying methodology analogous to that used during Raman data analysis, PLS modelling was performed (calibration curves and relative errors plots for milk constituents were shown in Fig. S8 of supplementary material). The following spectral ranges were utilised: 800–1017, 1063–1634 and 1732–1760 cm−1. Correlation coefficient values determined on the basis of ATR data varied from 0.991 to 0.995, while RSEP errors were 1.9–3.3% and 1.9–3.5% for calibration and validation samples, respectively. Representative results for the ATR PLS modelling are shown in Table 1. Quantitative analyses of commercial samples resulted in the RSEPtest error values of 2.4–4.4% (Fig. 4).
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