Method of purifying whey of lactic acid fermentation by electrodialysis

摘要

A method of purifying whey separated from lactic acid fermentation liquid by electrodialysis where the whey contains angiotensin-converting enzyme inhibiting peptides, where the method is carried out using an anion exchange membrane having a permeability of diffusion coefficient in the range of 3.0 to 9.0 x 10-6 cm/sec, where the diffusion coefficient of the anion exchange resin is determined by: i) Maintaining a first 0.5 normal sodium chloride solution on one side of the anion exchange membrane in a vessel, and maintaining a second 3.0 normal sodium chloride solution on the other side of the membrane in the vessel. ii) Stirring the first and second sodium chloride solutions. iii) Measuring the differences in the concentration of the two sodium chloride solutions. iv) Calculating the diffusion coefficient by applying the formula: Diffusion coefficient (cm/sec) = transferred amount of sodium chloride (mol/sec) * area of membrane (cm2) * DC (mol/cc).