Study on the physico-chemical properties of dietary fiber extracted from alcoholic fermentation mash of sweet potato residues

The alcoholic fermentation mashes originated from sweet potato residues were used as raw materials to extract dietary fiber by using the physical sieving method.The chemical composition,microstructure,color,particle size,water-holding capacity,oil-holding capacity and swelling property of the dietary fiber extracted from alcoholic fermentation mashes(AFDF)were investigated and then compared with those of sweet potato dietary fiber(SPDF),soybean dietary fiber(SDF)and oats dietary fiber(ODF),respectively.The results showed that AFDF had the highest pure degree with the value of 82.46% and a porous microscopic structure.In addition,the particle size of AFDF was in the range of 1~60μm with good water-holding capacity(11.84g/g),oil-holding capacity(1.85g/g)and swelling property(13.26mL/g).Therefore,AFDF could be used as a potential valuable dietary fiber source in food industries.