Fig. 3.

Principal component analysis of S. muticum. a From all FT-IR spectra (600–1800 cm⁻¹). b Phenolic compound of enzymatic extraction from the selected FT-IR spectra (865–880, 920–935, 1075–1090, 1445–1460, 1605–1620, 2930–2945, 3200–3300 cm⁻¹). ALC Alcalase; AMG Amyglucosidase, NEU Neutrase; TN control/aqueous extract, CEL Celuclast, SHE Shearzyme, TER Termamyl, ULT Ultraflo, VIS Viscozyme