Calcium is a very important component of milkin many ways. Milk is supersaturated in cal-cium, largely through its presence in the caseinmicelle as colloidal calcium phosphate (CCP),and hence is an excellent carrier of calcium forthe newborn. Besides its undisputed nutritionalvalue, calcium is also important for many func-tional proper ties of milk and milk products. Forexample, many authors have demonstrated itsrole in the heat stability of milk and how itinfluences the heat coagulation time (HCT)–pHrelationship (Singh 2004). HCT for unconcen-trated milk is the time taken for a milk to coag-ulate when heated at 140 °C. The most commonshape of the HCT–pH curve has a maximum atpH ~6.6–6.7 and a minimum at pH ~6.9. Cal-cium has an influence on the position of themaximum and minimum with addition of (ionic)calcium shifting the curve to higher pH (Jeurn-ink and de Kruif 1995; Singh et al. 2007; Sieva-nen et al. 2008) and removal of calcium bycation exchange or chelat ion shiftin g the curveto lower pH (Mohammed and Fox 1983; Jeurn-ink and de Kruif 1995). However, Singh (2004)cautioned that the results of HCT studies do notpredict with any certainty whether a milk willshow good heat stability during commercial ste-rilisation processes. Recently,