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A Quantitative Determination of the Ammonia, Amino Nitrogen, Lactose, Total Acid, and Volatile Acid Content of Cows' Milk

School of Hygiene and Public Health, the Johns Hopkins University, Baltimore, Maryland

ABSTRACT

The amino nitrogen content of the same sample of milk varied widely with the method of preparing the amino solution for use in the Van Slyke apparatus. Closely duplicating results were obtained from the same solution under the same conditions by the use of the Van Slyke micro-apparatus.

All samples of milk, when subjected to steam distillation, gave off a volatile sulphide.