Optimization of Extraction Technology for Insoluble Dietary Fiber from Fortuneana pyracantha Fruits by Response Surface Methodology

The alkali-catalyzed hydrolysis method was applied to extract insoluble dietary fiber(IDF) from the fruits of Fortuneana pyracantha and main process conditions were optimized by one-factor-at-at-a-time experiments and response surface methodology.The extraction rate and purity of IDF were investigated with respect to NaOH concentration,extraction time,extraction temperature and material-to-liquid ratio.The results showed that the optimal extraction conditions were NaOH concentration of 1.00%(g/g),extraction time of 3.00 h,extraction temperature of 77.8 ℃,and material-to-liquid ratio of 1:17(g/mL).Under the optimal extraction conditions,the extraction rate and purity of IDF were 56.89% and 92.74%,respectively.