The pH, unlike titratable acidity, did not change
significantly during 10 days of storage at 4°C
(3.87+0.07) (Figure 3). Sinclair and Jolliffe (1960) also
observed that pH and titratable acidity were not directly
related in samples of 'Valencia' orange juice. This is
probably due to the effect of the buffer capacity of the
fruit tissue, and it is a positive aspect since a small
variation in pH might imply a negative effect in flavour
(Chitarra and Chitarra, 1990).