Preparation method of fucosan

Abstract

The invention discloses a preparation method of fucosan. On the basis of the traditional preparation technology of the fucosan, HCl is adopted to adjust the pH value of solution, and metal chelating agent EDTA is added, so as to lead heavy metal ions originally chelated on the fucosan sulfate groups to shed off and form chelates with the EDTA. By adopting an ultrafiltration technology, the EDTA-heavy metal chelates are separated from the fucosan, and concentrated, and the fucosan after the removal of heavy metal elements can be prepared through freeze-drying. The preparation method has the advantages of simple operation, mild conditions, high shedding rate of heavy metal ions, low cost and the like, and is suitable for large-scale operations.

Description

technical field

[0001] The present invention relates to a method for preparing fucoidan from seaweed and removing heavy metal ions, in particular to the technical method of combining pH adjustment with metal ion chelating agent EDTA to remove heavy metal elements As, Preparation method of Ag, Cd, Pb fucoidan. Background technique

[0002] Fucoidan is an acidic sulfate polysaccharide present in the cell wall of brown algae (such as kelp), and its molecular structure contains sulfate ( ＝ SO 4 ) and uronic acid (COOH) and other structural components, so that the polysaccharide has the characteristics of a polyanion system, which can bind heavy metal ions in the ocean (such as As +2 、Ag +2 、Cd +2 , Pb +3 ). Heavy metals are extremely harmful to the human body. Although these heavy metals exist in a complex form in fucoidan, once the polysaccharide enters the human body, due to the acidic medium conditions of the intestinal tract, these heavy metal elements may be dissociat...

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