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Journal of Dairy Science Vol. 46 No. 3 181-185
© 1963 by American Dairy Science Association ®
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Optimum Ratio of Cations on Nuclear Sulfonic Acid Resin for Minimum Change in Composition of Resin-Treated Milk

Albert R. Landgrebe, L. F. Edmondson and F. W. Douglas, Jr.

Dairy Products Laboratory,1 Eastern Utilization Research and Development Division, USDA, Washington, D. C.

ABSTRACT

The optimum mole fraction of the major cations (Ca++, K+, Na+, and Mg++) on a strong sulfonic acid ion exchange resin for minimum change in milk composition was determined by equilibrating the resin with milk at pH 5.4 and 6.6. The fraction of calcium on the resin increases with decreasing pH, whereas those of sodium and potassium decrease. Since magnesium is present in relatively small amounts, it appears to be little affected by pH, possibly due to experimental error involved in its determination.

By using the milk-equilibrated mole fraction of the cations on the resin, and the apparent equilibrium constants involving these ions and the resin, mixed regenerating solutions of the chlorides of the four cations were prepared. The concentrations were adjusted so that the ratio of ions on the resin would be in equilibrium for milk at pH 6.6 and 5.4. Milk passed through columns of these resins showed little change in the cationic composition.

The cationic composition of milk varies with breed of the animal, season of the year, and with other factors. Consequently, the milk-equilibrated mole fraction of cations placed on a resin will vary. The effect of this variability of changes required in the regenerant composition is the subject of a current study.

FOOTNOTES

1 A joint research project supported by the USPHS and AEC.






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Copyright © 1963 by the American Dairy Science Association ®.