3.2 Anthocyanin concentration and pH effect
Experiment result is shown in Table 2 and 3. Significant parameters were color parameters in transmission mode; L* and a*, color parameters in reflection mode; L*, a* and b*, and antioxidant activity of the extracts. On the other hand, the color acceptance was not significant because color preference between each individual might be different. All mathematical models, p-values and also R2 of the models are summarized in Table 4. Lack-of-fit testing for all models was not significant with 95% confident interval.