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The Influence of Certain Factors on the Hydrogen Ion Concentration of Milk. I

Chemical Laboratory, Purdue University, Lafayette, Indiana

ABSTRACT

Conclusion: Studies were made to determine the effect of feeding lactic, butyric, acetic and phosphoric acids in the H⁺ ion concentration and total acidity of milk; to determine the changes, if any, produced when the cows were changed from a dry ration to a pasture ration. Little, if any, effect on the reaction of milk was noticed from feeding the above mentioned acids, either on the H⁺ ion concentration or total acidity. A marked decrease in total acidity was noted when the cows were changed from the winter ration to the summer ration, with practically no change in the pH value.

The author takes this occasion to thank Dr. Ernest Anderson, of the University of Nebraska, for very kindly suggesting the problem and preliminary methods, the Purdue Dairy Department for loaning the cows, Dr. P. N. Evans of the Chemistry Department of Purdue, for furnishing supplies, and Dr. Hoffer and Mr. John Trost for the use of their laboratory and apparatus.