Fig. 3

PCA score plots of EMSC corrected, according to the preprocessing strategy (b). FTIR spectra for lipid region 3100–2800 cm⁻¹ combined with 1800–1700 cm⁻¹ (A), protein region 1700–1500 cm⁻¹ (B), and carbohydrate region 1200–700 cm⁻¹ (C)