The effects of disodium hydrogen phosphate on the
heat stability of goat milk and cow milk are shown in Figure
5. Figures 4 and 5 show that a similar effect may be produced
by concentrations of disodium EDTA and disodium hydrogen
phosphate in the same range from 0.02 to 0.1 mol/L. The
differences between goat milk and cow milk were significant
at disodium hydrogen phosphate concentrations of 0.06 and
0.08 mol/L (p < 0.05) and were very significant at 0.1mol/L
(p < 0.01). This was because phosphate can also combine
with calcium and reduce calcium activity. Although heating
treatment decreases the pH of milk adding phosphate
inhibited the reduction in pH during pasteurization treatment
or before UHT treatment. This agreed with a previous study
(Boumpa, et al. 2008). Therefore, adding inorganic
phosphate could increase the buffering capacity.