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The colour variation, colour intensity and stability at various pH values   (2.0, 4.0, 7.0 and 9.0) of cyanidin 3-O-β-glucopyranoside (Cy3Glc) and its   aglycone cyanidin was investigated during a period of 8 hours storage at   25ºC. Our data showed that pH of aqueous solution had impact on spectroscopic   profile of cyanidin and Cy3Glc. Beginning with the most acidic solutions,   increasing the pH induce bathochromic shifts of absorbance maximum in the   visible range for all examined pH values (with the exception pH 4.0 for   cyanidin), while the presence of the 3-glucosidic substitution induce   hypsochromic shift. Compared to cyanidin, Cy3Glc has higher colour intensity   and higher stability in the whole pH range, except at pH 7.0. The   3-glucosidic substitution influences on the colour intensity of Cy3Glc in the   alkaline region. After 8-hour incubation of Cy3Glc and cyanidin at pH 2.0 and   25 ºC, 99% of Cy3Glc and only 27% of cyanidin remained unchanged

Effects of pH on the stability of cyanidin and cyanidin 3-O-β-glucopyranoside in aqueous solution