Oblon, Spivak, McClelland, Maier & Neustadt
Process for isolating and purifying amino acids
 A process for isolating and purifying an amino acid, which comprises subjecting an aqueous solution of said amino acid containing impurities composed mainly of at least one member selected from the group consisting of acidic amino acids, lysine, ornithine, citrulline, histidine, PCA, sulfate ions, chloride ions and pigments to ion-exclusion chromatography using a strongly acidic cation exchange resin. 
Ajinomoto Company, Inc.
C
C07D
inventional
Akio Hisao Masasi Masayoshi
Nishi Ito Miyazawa Naruse