Anthocyanin concentration andpH 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, pvalues
and also R
2
of the models are summarized in Table 4. Lack-of-fit testing for all models was
not significant with 95% confident interval