Study on the technics of preparing soluble dietary fiber of high quality

In order to make full use of soybean resources,we took the bean waste from beancurd and soybean milk as raw material to produce soybean soluble dietary fiber(SDF) in the application of instantaneous ultrahigh pressure process,the centrifugal separation technology and the spray drying technology.The retention ability,the expansion rate and the solubility of SDF were determined.And we studied to extract soybean SDF in the use of enzyme - alkali technique,discovering that the optimal preparing condition of the four factors:the caustic concentration,the enzyme amount used,the alkali reactive temperature and the enzymolysis time.Through the orthogonal experiment,the best technology was:the caustic concentration 0.6%,the alkali reactive temperature 65℃,the enzymolysis time 55min,the enzyme amount 220000U.Under this condition,the content of soybean SDF(SDF/TDF) produced through the use of enzyme - alkali technique reaches 21.35%.After processed by the micro jet flow viscolizer under the operation pressure of 140MPa,the SDF/TDF could increase to 37.42%.The retention ability,expansion rate and solubility were respectively 10.697g/g,830%,22.38g/100mL.