| Insoluble dietary fiber (IDF) was extracted from Prunus humilis pomace via alkaline extraction. Using IDF extraction yield as the response variable, the extraction process was optimized based on single-factor experiments combined with response surface methodology, and the microstructure and physicochemical properties of the extracted IDF were analyzed. The results showed that the optimal extraction conditions were: NaOH concentration 2.06%, liquid-to-solid ratio of 20 mL∶1 g, alkaline hydrolysis time 98 min, and at 60 °C, yielding an IDF extraction rate of 51.71%. Compared with the pomace, the water-holding capacity, oil-holding capacity, and water-swelling capacity of the IDF increased by 46.51%, 56.86%, and 26.71%, respectively. The chemical composition of the IDF exhibited typical dietary fiber characteristics, and its surface was rough, loose, and porous. These results indicate that Prunus humilis pomace is a valuable source of high-quality dietary fiber and provide supporting data for the development and application of IDF from this material. |
