| 摘要 |
PURPOSE:To obtain a food fiber-containing dextrin sufficiently usable as a food fiber by reacting alpha-amylase to an aqueous solution of calcined dextrin and, as necessary, further hydrogenating the reaction product. CONSTITUTION:A calcined dextrin is prepared preferably by adding an aqueous solution of a mineral acid (especially hydrochloric acid) to raw starch, preliminarily drying to a water-content of about 5% and calcining the product. The calcined dextrin is dissolved in water to a concentration of 30-50wt.%, neutralized to pH5.5-6.5 (preferably 5.8), added with 0.05-0.2wt.% of alpha-amylase and maintained at the working temperature of 85-100 deg.C for 30min-2hr. After proceeding the enzymatic decomposition of dextrin to alpha-limit dextrin, the temperature is raised to 120 deg.C to complete the enzymatic action of the alpha-amylase. The obtained liquid is purified by conventional purification process, concentrated and spray-dried to obtain a food fiber-containing dextrin free from ill odor and irritant taste and utilizable for food. |
