Magnesium in the Casein-containing Colloid of Milk

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Abstract
Magnesium exists in milk as a part of the colloid system and in solution. A study was made on the proportion bound to the colloid and the condition of this Mg. The colloid was separated by centrifugation and colloid was washed free of serum. Analysis was made on the colloid and on the depleted serums. About one-third of the Mg in milk was bound to the casein-containing colloid of milk. The concentration of Mg in this colloid was 0.11%, on the dry basis, corresponding to a mole ratio for Ca to Mg of 15:1. Comparisons are made to work and conclusions of others.

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