Abstract
The distributions of protein, calcium and inorganic phosphate among casein micelles of skimmilk before and after frozen storage were investigated by gel filtration through Sephadex G-200 with 6.6 m urea solution as eluant. The results showed that the native casein micelles were fractionated into two fractions. Fast eluting fraction contained large amount of calcium and inorganic phosphorus. Slow eluting fraction contained calcium but was essentially free of inorganic phosphorus. Frozen storage caused the increase of proportion of the fast eluting fraction accompanying the increase of calcium and inorganic phosphorus contents in it. It is suggested that the salt linkage newly formed during frozen storage causes the increase of proportion of the fast eluting fraction.
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