Soybean dietary fiber（SDF） were prepared by the methods of acid hydrolysis and alkaline solution extracting from byproduct of manufacturing bean curd. The optimum conditions for extracting dietary fiber from soybean dregs was to extract at 95 ℃ for 1.5 h,with acid liquor（pH=3） and a 1∶10 sample weight/solvent volume ratio. And after the lye（pH=11,regulated with NaOH） at 40 ℃ for 2 h. Under the above conditions,the cellulose content of SDF was 72.04% . Microcrystallized soybean dietary fiber（MSDF） with 91.43% cellulose content and physical chemistry has been ...
