shows the relative chlorophyll pigment retention at various pH levels measured at different treatment times. The chlorophyll pigment retention remained at a relative high value during the 30 min period of incubation at pH 3 compared to other pH values. Except pH 3, the neutral and alkaline pH values (pH 7, 6, 10, 8 and 9) resulted in a slightly higher chlorophyll pigment retention than acidic pH values (4, 2 and 5). However, the pH effect did not show any regular trends among different values, indicating the comprehensive change of different chlorophyll pigments at different pH values. After 30 min incubation, the maximum retention was observed for the puree with pH 3, in contrast to the minimum value that was obtained for the puree having pH 5