Study on the physico-chemical and functional properties of dietary fiber extracted from sweet potato starch residues

In this study,the dietary fiber were extracted and purified from sweet potato starch residues of Anhui,Beijing Miyun and our laboratory by sieving and enzymolysis method,and its composition and physico-chemical properties were investigated.The results showed that the dietary fiber extracted from Anhui's residue had a highest total dietary fiber(TDF) and soluble dietary fiber(SDF) content compared to other two different residues,it was 85.32% and 13.92% respectively.All of the purified dietary fiber possessed a high water-holding capacity,oily-holding capacity and swelling capacity value.In addition,the dietary fiber of Anhui exhibited excellent fat absorption capacity,α-Amylase Inhibitory activity and pancreatic lipase inhibitory activity.It was,therefore,suggested that the dietary fiber which is extracted from residues of large-scale sweet potato starch factories should has the good prospects of commercial application.