Methods for purifying chitosan

Details Methods for purifying chitosan Methods for purifying chitosan

2005-05-24

2005-05-24

Drodge, Joseph (Department: 1723)

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

C210S639000, C210S702000, C210S729000, C536S020000, C536S127000, C514S055000

Reexamination Certificate

active

06896809

ABSTRACT:
One method for purifying a chitosan starting material includes contacting it with at least one treatment agent selected from a protein-complexing agent, a metal-chelating agent, and a metal-complexing agent under pH conditions effective for forming a water insoluble chitosan precipitate and at least one water soluble material selected from a water soluble protein complex, a water soluble metal chelate, and a water soluble metal complex. Another variant involves solubilizing the chitosan starting material in an aqueous solution to produce an intermediate chitosan material. The intermediate chitosan material is contacted with a deproteinization agent and/or a demetallization agent under pH conditions effective for forming a water insoluble chitosan precipitate and at least one water soluble material that includes the pre-existing impurity. In both methods, the water insoluble chitosan precipitate and the water soluble material are separated resulting in a purified chitosan material.

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