抄録
The amino acids are produced usually by the fermentation as mixtures, which may be regarded as cations or anions according to the pH of the solution. The electrodialysis with ion-exchange membranes seems to be a very useful method to separate a desired amino acid from mixed amino acids. However, there has been no such study on a quantitative basis. In this work, using a glycine (Gly) as a typical amino acid, we studied the variation of the flux (J) of Gly as a function of pH during the electrodialysis and found that the flux of Gly was maximum at pH ≒ 3. It was also found that the relationship between the electric current density (I) and the flux of the total cations (JGly+H) was represented by a straight line through the origin when the concentration of Gly and pH were kept constant. It was evident that JGly+H was constant as long as I and pH were kept constant, independently of the concentrations of Gly.
