(a) Total (closed black symbols) and casein-bound (closed grey symbols) calcium. (b) Total (closed black symbols) and inorganic casein-bound (closed grey symbols) phosphate. (c) Soluble calcium (closed symbols) and phosphate (open symbols). (d) Total sodium. (e) Milk pH. (f) OD of unheated milk samples as a function of the dialysis time for three dialysis experiments, D1 (♦), D2 (■) and D3 (●). The three dialysis were performed against a milk permeate containing a weak cation-exchanger. Bars are the standard deviations.