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Composition of Granules in Evaporated Milks Stored at Low Temperatures

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

ABSTRACT

Compositional analysis of granules from evaporated milks stored at low temperatures (2–4 C) for several years showed them to consist of about 50% phosphate and 21% calcium. The molar ratio of calcium to phosphate is approximately 1:1, which corresponds to the formula CaHPO. By contrast, granules obtained from evaporated milks stored at room temperatures are known to have a composition corresponding to tricalcium citrate. The granules of evaporated milks stored at low temperatures also contain an insoluble matrix of peptide-like material. After the dibasic calcium phosphate was dissolved with M HCl, this material remained. A part of this material can be dissolved in NaOH, after which it is soluble at neutrality. Amino acid analysis of this base-soluble fraction shows it to be high in glutamic acid.