Preparation method of Astragalus polysaccharide-iron

The invention provides a preparation method of Astragalus polysaccharide-iron. The method comprises the following steps: 1, extracting and purifying Astragalus polysaccharides; and 2, preparing Astragalus polysaccharide-iron: dissolving the purified Astragalus polysaccharides obtained in step 1, sodium tartrate and sodium carbonate in distilled water according to a weight ratio of 15:3:5, adding an iron salt solution with the weight 0.8-0.9 times the weight of the pure Astragalus polysaccharides to obtain a solution A, allowing the solution A to go through an exchange column loaded with basic ion exchange resin at a flow velocity of 3-8BV/h, reacting for 0.5-1h, cooling the obtained reaction product, filtering resin, flushing the surface of the resin with deionized water 3-5 times, carrying out alcohol precipitation with ethanol with the concentration of 75-85%, and drying the obtained precipitate at 50-70DEG C to obtain the Astragalus polysaccharide-iron. An ion exchange resin technology is adopted to cataly