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Properties of Some Acid Caseins^*

Bureau of Dairy Industry, U. S. Department of Agriculture, Washington, D. C.

ABSTRACT

The claim has been made that imported casein is superior to the domestic product and is, therefore, preferred by paper-coaters, the principal users of casein. In order to obtain data on the properties of domestic casein, a number of samples were analyzed and tested within a few days after their receipt from the manufacturers. Data on the first ten of the samples received are presented here. In a majority of the samples the dry casein had evidently been placed in the mailing cases as it came from the trays. The samples were all ground to a uniform size so that practically all of the particles would pass through a 20-mesh sieve.

Appearance. The appearance of the samples after grinding to a uniform size was much the same except for a small variation in the amount of dirt and burned particles. The color was good. Particle size affects color. Differences in this property may best be determined by examining solutions of the samples.

^* Presented at the Annual Meeting of the American Dairy Science Association, Ames, Iowa, June, 1930.