Composition of Granules in Evaporated Milks Stored at Low Temperatures

Compositional analysis of" ~'ranules from evaporated nfilks stored at low temperatures (2-4 C) for several years showed them to consist of about 50q:~ phosphate and 21% ealcimn. The molar ratio of calcium to phosphate is approximately ] :1, which corresponds to the fornmla CaHPO, By contrast, granules obtained from evaporated milks stored tat room temperatm'es are known to have a composition corresponding to tricaleimn 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 ar HCI. 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 glntamic acid.