The butterfly pea solution stored at 4 C showed higher color stability than the solution stored at 40 C. The effect of
rising temperature on color loss was more predominant on neutral solution (pH 7) than the acidic and alkaline solutions (pH 4 and 10, respectively); color remaining of 90% was observed in 15 days at pH 4 and 10 while it was in 1 day at pH 7. Increasing temperature induces the loss of glycosyl moieties of anthocyanin by the hydrolysis of glycosidic bond [15]. The resulting aglycones are less stable and lead to the loss of anthocyanin color. In general, anthocyanins are more stable in the acidic medium at low pH than in the alkaline medium at high pH. However, several studies demonstrated
that some anthocyanins showed an improvement ofcolor stability in the alkaline region around pH 8-9
[16, 17]. The color extract was the most stable in acidic solution at 4 ÌC and the least stable in neutral solution at 40 ÌC.