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Effect of _s1-, ß- and -Casein Polymorphs on the Stability of Calcium Caseinate Micelles in Model Systems

Department of Animal and Range Sciences Montana State University, Bozeman 59715

ABSTRACT

Six samples of a_s1 + ß-caseins representing all known polymorphs, except _s1A and ßC were prepared and purified. Four samples each of A, B, AB were also prepared and purified. Interactions occurred in model systems containing .02 to .22 kappa/_s1 + ß-casein ratios, and .02 m Ca, at pH 6.80 and stability was measured in percentage soluble _s1 + ß-casein.

Alpha _s1B+ßB, _s1B+ßAB produced more stable micelles than did _s1B+ßA in presence of all -casein polymorphs. Replacement of _s1B with _s1C or _s1BC generally resulted in significant reduction in micelle stability.

In most cases AB was the most effective micelle stabilizer followed closely by B whereas A was the least effective. The effectiveness was markedly influenced by the _s1+ß-casein polymorphs present and the /_s1+ß casein ratio.

At high Ca concentration, (up to .12 m), B produced the least stable micelles in presence of all polymorphs of _s1+ß-casein. Generally, _s1B+ßB produced the most stable micelles, under these conditions, whereas those produced by _s1B+/ßA were the least stable.