To provide an organic solvent solution of carboxy-polysaccharides, metal salts thereof or derivatives thereof, and to provide a preparation method of such an organic solvent solution.
The solution of carboxy-polysaccharides, metal salts thereof or derivatives thereof comprises carboxy-polysaccharides, metal salts thereof or derivatives thereof dissolved in a mixed solvent of dimethyl sulfoxide and an acid compound having a pKa of 4 or lower. The method for obtaining the solution of carboxy-polysaccharides, metal salts thereof or derivatives thereof comprises dispersing carboxy-polysaccharides, metal salts thereof or derivatives thereof in dimethyl sulfoxide and adding thereto the acid compound in an amount such that protons of the acid compound is 0.1-10.0 molar equivalent based on 1.0 molar equivalent of a carboxy group.
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