The pH-dependent characteristics of anthocyanins can be
attributed to the molecular structures of anthocyanins transforming along with the pH of the solution (Brouillard, 1983; Mazza
& Brouillard,1987) or to the aggregations of the anthocyanins in the
forms of carbinol sidebars or quinonoidal base (Brouillard, 1983). To
our knowledge, the present study is the first to report on the color
attributes represented by the Ab510, L*, or a* of SJ in a wide range of
pH. These results demonstrate that pH is a more important factor of
the color stability of SJ than temperature. A small variation in pH
can significantly change the color and color stability of SJ, as well as
increase the color sensitivity to heat.