Composition of Granules in Evaporated Milks Stored at Low Temperatures

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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 percent phosphate and 21 percent Ca. The M ration of Ca to phosphate is approximately 1:1, which corresponds to the formula CaHPO4- By contrast, granules obtained from evaporated milks stored at room temperature are known to 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 HC1, this material remains. 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.