641257.fig.007a
(a)
641257.fig.007b
(b)
Figure 7: Plot of the calcium carboxylates (1576 cm−1) (a), and zinc carboxylates (1540 cm−1), (b), peak area versus heating time at constant temperature of 30 (), 50 (□) and 70 () °C for one year aged nonsterilized samples.