Fig. 1. (a) the surface morphology of fresh chestnut rose pulp; (b) the surface morphology of chestnut rose pulp after being stored at room temperature for 48 hours

Fig. 2. Infrared spectra of fresh chestnut rose pulp and chestnut rose pulp stored at room temperature for 48 h
(a): Fresh pulp sample; (b): Stored at room temperature for 48

Fig. 3. (a) and (b) are the infrared spectra of fresh pulp and dried pulp samples by ultrasonic-assisted solvent extraction, respectively

Fig. 4. a, b are the corresponding infrared spectral transmittance intensities at 3 431 cm^-1 of fresh pulp and dried pulp using ultrasonic-assisted solvent extraction

Fig. 5. (a) and (b) are the morphology and infrared spectrum of the flavonoid powder sample extracted by the ultrasonic-assisted solvent extraction method under the microscope

Fig. 6. (a) and (b) are the Fourier infrared spectra of samples extracted from fresh pulp and dried pulp using ultrasound combined with enzyme-assisted semi-biomimetic method to simulate gastric digestion

Fig. 7. a and b are the corresponding transmittance intensity at 3 419 cm^-1 of the infrared spectrum of the fresh pulp and dried pulp by ultrasound combined with enzyme-assisted semi-bionic simulated gastric digestion sample

Fig. 8. (a) and (b) are the Fourier infrared spectra of fresh pulp and dried pulp samples by ultrasound combined with enzyme-assisted semi-bionic gastric acid simulation extraction

Fig. 9. (a) and (b) are the infrared spectra of the simulated extraction samples of fresh pulp and dried pulp ultrasonic combined with enzyme assisted semi-bionic intestinal digestion