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Fourier-transform infrared spectroscopy (FT-IR) spectra of ASWP and three ASEPs. ASWP was obtained from Aster scaber using hot water extraction; ASEP-A, ASEP-C, and ASEP-P were obtained from Aster scaber using α-amylase, cellulase, and pectinase, respectively, in an enzyme-assisted extraction. The red dashed circle indicates the stretching peaks in the region of 1200–1000 cm−1.
