The pH of Milk72 and Milk95 (Fig. 1) decreased during storage,but the decrease was more pronounced in Milk72, by
approximately 0.2 pH-units. The larger decrease inMilk72 can be related to
the residual PL activity in the sample and proteolysis after lysine residues (Kelly & Foley, 1997; Kohlmann et al., 1991). Interestingly,the pH did not decrease further after the onset of gelation after 10 weeks storage.