Patent ID: 6392094
Filing Date: 2002-05-21
Classification: C12P

Abstract:
A method for recovering amino acids, which comprises supplying a mixed solution containing inorganic acid salts, coloring matters, ashes, betaines, amino acids and non-electrolytes including saccharides to a first resin layer comprising a sodium type strongly acidic ion exchange resin or a potassium type strongly acidic ion exchange resin; separating an effluent which flows out of the first resin layer using water or an aqueous solution of caustic alkali as an eluent into at least a first fraction containing coloring matters, acidic amino acids and ashes, a second fraction containing neutral amino acids and saccharides, and a third fraction containing betaines; supplying the second fraction to a second resin layer comprising an ammonium type strongly acidic ion exchange resin to allow the neutral amino acids to be adsorbed by the second resin layer; and recovering an effluent which flows out of the second resin layer using an aqueous solution of ammonia as an eluent, thereby recovering tyrosine and a mixture of the neutral amino acids contained in the effluent.