Abstract
Approximately 40% of the calcium existing in colloidal phase of skimmilk was estimated to be hardly exchanged with the calcium psesent in soluble phase by applying a radioisotopic technique. This type of calcium was designated hard-to-exchange calcium. Hard-to-exchange calcium was absent or nearly zero in calcium caseinate dispersion or colloidal phosphate-free milk, but was present in composite calcium caseinate phosphate dispersion. It is suggested that hard-to-exchange calcium is present in a part of colloidal phosphate portion of casein micelles.
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