Abstract The distribution of Ca, Mg, K and Na between the sedimentable (200×g), protein-associated and soluble phase of infant formula (IF; n = 46), follow-on formula (FOF; n = 8), junior growing up milk (jGUM; n = 22) and senior GUM (sGUM; n = 16) were studied. For all product classes, virtually all Na and K was in the soluble phase and small amounts were found as protein-associated, i.e., as counterions. Most Mg was also found in the soluble phase, but a notable proportion (20–30%) was found to be protein-associated. Sedimentable Mg was only found in a few samples. Particularly in IF and FOF products, notable amounts of sedimentable Ca were observed; the proportion of protein-associated Ca increased with increasing casein content of samples, but even after correction for casein content, large differences (>2-fold) remained between products. These differences in casein mineralisation can affect physicochemical properties and colloidal stability.

中文翻译：

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婴幼儿营养配方中的盐平衡

摘要 Ca、Mg、K 和 Na 在婴儿配方奶粉 (IF; n = 46)、后续配方奶粉 (FOF; n = 8)、初级配方奶粉 (IF; n = 46) 的可沉淀 (200 x g)、蛋白质相关和可溶相位之间的分布研究了成长奶 (jGUM; n = 22) 和高级 GUM (sGUM; n = 16)。对于所有产品类别，几乎所有 Na 和 K 都处于可溶相中，并且发现少量作为蛋白质缔合，即作为抗衡离子。大多数镁也存在于可溶相中，但发现显着比例（20-30%）与蛋白质相关。仅在少数样品中发现了可沉淀的镁。特别是在 IF 和 FOF 产品中，观察到显着量的可沉淀钙；蛋白质相关 Ca 的比例随着样品中酪蛋白含量的增加而增加，但即使对酪蛋白含量进行校正后，产品之间仍存在较大差异（> 2 倍）。