Patent ID: 7087775

Claim:
A preparation method of an organic chelate having the structure of following chemical formula 1 comprising the steps of: 1) precipitating metal hydroxides by using sodium hydroxide or potassium hydroxide after dissolving a salt containing mineral to be coordination-bonded with an amino acid in the water; 2) removing water soluble salts such as potassium sulfate, sodium sulfate, potassium chloride or sodium chloride from a aqueous solution by filter press; 3) dissolving the filtered metal hydroxides M(OH) 2 (wherein M is a metal ion) in hydrochloric acid; 4) dissolving an amino acid completely and mixing in the solution; 5) titrating slowly with sodium hydroxide until reaching the pI value of an amino acid; 6) filtering and drying produced particles; wherein M is copper, iron, zinc, manganese, or cobalt, and R is a side chain of an amino acid.