Influence of Pasteurization and Cool-Aging on the Behavior of Pure Salt Solutions Prepared in Accordance with the Composition and Concentrations in Milk

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Abstract
In a solution of pure salts, prepared to simulate the composition of salts in milk serum, only 35.9, 72.9, 54.8 and 80.9% of Ca,Mg, Pand citric acid respectively, were in solution. The remaining separated as colloidal sediment upon centrifugation. Storage of the solution resulted in formation of grains resembling lime grains of evaporated milk. Ca:P ratio of 1.46 in sediment indicated presence of tricalcium phosphate. Pasteurization decreased soluble Ca and pH with reversal on cool aging. Soluble P decreased on pasteurization and on cool aging of the pasteurized lot. The original solution showed decrease in Ca:P ratio in sediment to 1.26 on cool aging and changed to 1.63 on pasteurization which also decreased to 1.08 on cool aging. Ca addition increased Ca:P ratio and P decreased it. The pH decreased with added Ca and increased with added P. The undissolved Ca, Mg, P and citric acid were in harmony with their presence as tribasic citrates and/or phosphates of Ca and/or Mg. The relationships obtained in milk are also discussed.