Abstract
The procedures for the elution of vitamin B_<12> adsorbed on ion exchangers may be performed in two ways. The one is the physical method and the organic solvent is used for the loosening the binding between ion exchanger and vitamin B_<12>. The other is the chemical method and the alkaline salt of week acid is used for ion exchange reaction. The authors studied the elution velocity and the equilibrium relation about above two methods.
