The plot between the total color difference of pineapple juice and time is shown in Fig. 4.
The results showed that DE increased significantly at higher heating temperatures and prolonged processing times.
It was also observed that the first portion of the curves exhibited steeper slopes as the heating temperature increased.
It means that higher temperature accelerated the chemical reactions and most of the color change occurred during the early heating period. To describe the reactions closely, the juice samples may be taken more frequently at higher heating temperatures.