Effect of αs1-, β- and κ-Casein Polymorphs on the Stability of Calcium Caseinate Micelles in Model Systems

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Abstract
Six samples of asl-k fl-caseins representing all known polymorphs, except asia and tic were prepared and purified. Four samples each of KA, KB, KAB were also prepared and purified. Interactions occurred in model systems containing .02 to .22 kappa/aslq-B-casein ratios, and .02 ~ Ca, at pH 6.80 and stability was measured in percentage soluble aslq-B-casein. Alpha slB+BB , a~IB-kBAB produced more stable micelles than did aslBq-flA in presence of all K-casein polymorphs. Replacement of aslB with aslC or aslBC generally resulted in significant reduction in micelle stability. In most cases KAB was the most effective micelle stabilizer followed closely by KB whereas KA was the least effective. The effectiveness was markedly influenced by the a~l-kB-easein polymorphs present and the K/asl-~-B casein ratio. At high Ca concentration, (up to .12 ~), KB produced the least stable micelles in presence of all polymorphs of asl-k ficasein. Generally, aslBq-flB produced the most stable micelles, under these conditions, whereas those produced by a~IB~-BA were the least stable.

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