Patent ID: 8053470

Claim:
A method for preparing a ferric-saccharide complex, comprising: (1) preparing a polynuclear ferric hydroxide; (2) reacting said ferric hydroxide with a saccharide under an alkaline condition; wherein preparing the polynuclear ferric hydroxide includes: adding an aqueous solution of an alkaline substance drop-wise into an aqueous solution of iron salt at a temperature of 5-17° C., until the reaction reaches its end point of pH 6-8, then separating and collecting the polynuclear ferric hydroxide from the reaction mixture; and wherein reacting said polynuclear ferric hydroxide with saccharide under an alkaline condition comprises: reacting the polynuclear ferric hydroxide with a saccharide in an alkaline solution at a temperature of 106-125° C. under pH 9-12 for 10-30 hours, then collecting iron saccharide complex final product from the reaction mixture.