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Incorporation of individual casein constituents into casein aggregates cross-linked by colloidal calcium phosphate in artificial casein micelles

Published online by Cambridge University Press:  01 June 2009

Takayoshi Aoki
Takayoshi Aoki
Affiliation:
Department of Animal Science, Faculty of Agriculture, Kagoshima University, Kagoshima 890, Japan
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Summary

Artificial casein micelles were prepared at a casein concentration of 2·5% with 10–40 mM-Ca, 12–27 mM-phosphate and 10 mM-citrate and cross-linking of casein by colloidal Ca phosphate (CCP) was examined. No casein aggregates cross-linked by CCP were formed at 10 mM-Ca, 12 mM-phosphate and 10 mM-citrate, which are the approximate concentrations found in the soluble phase of bovine milk. Although the amounts of casein aggregates cross-linked by CCP and of colloidal inorganic phosphate increased with increasing Ca and phosphate concentrations, the effect was not uniform. The incorporation rates of individual casein constituents into casein aggregates cross-linked by CCP were in the order > > β-casein. This was the reverse of the order of dissociation rates during dialysis of casein aggregates cross-linked by CCP reported previously.

Type
Original Articles
Information
Journal of Dairy Research , Volume 56 , Issue 4 , August 1989 , pp. 613 - 618
Copyright
Copyright © Proprietors of Journal of Dairy Research 1989

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References

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