Methods for preparing indigestible dextrin with high indigestible fraction

摘要

The indigestible dextrin with high indigestible fraction was prepared by treating the enzyme hydrolysate of pyrodextrin with ethanol or strongly acidic cation exchange resin(UBK 530). Optimum conditions of ethanol treatment for preparing the indigestible dextrin from #alpha#-amylase and amyloglucosidase treated hydrolysate were determined based on the indigestible fraction, dietary fiber content, and yield. Ethanol was added 5-fold by weight to 30 percent (w/w) enzyme hydrolysate, and the mixture was kept at room temperature for 3 hr. Low molecular weight saccharides containing glucose and high molecular weight saccharides were separated by strongly acidic cation exchange resin. While initial enzyme hydrolysate by #alpha#-amylase and amyloglucosidase showed 43.6 percent of DP1(glucose) and 51.1 percent of DP4+(maltotetraose and over), the indigestible dextrin collected to 50 percent of initial enzyme hydrolysate by treatment of cation exchange resin showed 7.1 percent of DP1(glucose) and 91.2 percent of DP4+(maltotetraose and over). In conclusion, 44.5 percent of indigestible fraction of initial enzyme hydrolysate increased to 78.9 percent after separation of low molecular weight saccharides.