Method of purifying whey of lactic acid fermentation by electrodialysis
AssigneeCalpis Co., Ltd.
InventorsShuji Kitamura, Takashi Ueyama
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Abstract
In a method of purifying whey separated from lactic acid fermentation liquid by electrodialysis wherein said whey contains angiotensin-converting enzyme inhibiting peptides, the improvement which comprises using an anion exchange membrane having a permeability of diffusion coefficient in the range of 3.0 to 9.0×10−6 cm/sec. An anion exchange membrane having a permeability of diffusion coefficient in the range of 5.0 to 7.0×10−6 cm/sec. is more efficiently used. The product is particularly suited to produce granules and tablets.
Claims6
In a method of purifying whey separated from lactic acid fermentation liquid by electrodialysis wherein said whey contains angiotensin-converting enzyme inhibiting peptides, the improvement which comprises carrying out said method using an anion exchange membrane having a permeability of diffusion coefficient in the range of 3.0 to 9.0×10−6 cm/sec, wherein the diffusion coefficient of the anion exchange membrane is determined by:
- (a) 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 said vessel;
- (b) stirring the first and second sodium chloride solutions;
- (c) measuring the differences in the concentration of the two sodium chloride solutions, and
- (d) calculating the diffusion coefficient by applying the formula:
- Diffusion coefficient (cm/sec)=transferred amount of sodium chloride(mol/sec)*area of membrane(cm2)*ΔC(mol/cc).
Dependencies are inferred from the claim text.