Selenized water-soluble dietary fiber and preparation method thereof

The invention relates to the technical field of food processing, and discloses a preparation method of a selenized water-soluble dietary fiber. The method comprises the following steps of 1) dissolving the water-soluble dietary fiber in nitric acid, stirring the water-soluble dietary fiber with a sodium selenite solution at a constant temperature of 40-60 DEG C for 5-7 h, and cooling; and 2) adjusting the pH value of the reaction solution obtained in the step 1) to be 5-6, adding sodium sulfate, centrifuging to obtain supernate, and dialyzing to obtain the selenized water-soluble dietary fiber. The water-soluble dietary fiber and the inorganic selenium are combined and converted into organic selenium, the toxicity of the inorganic selenium is reduced, the absorption utilization rate is improved, the activity of the water-soluble dietary fiber is improved, and the water-soluble dietary fiber is more beneficial to human and animal body utilization. 本发明涉及食品加工技术领域，公开了一种硒化水溶性膳食纤维的制备方法。包括以下步骤：1)水溶性膳食纤维溶解于硝酸中，在BaCl催