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

The colour variation, colour intensity and stability at various pH values (2.0, 4.0, 7.0 and 9.0) of cyanidin 3-O-?-glucopyranoside (Cy3Glc) and its aglycone cyanidin was investigated during a period of 8 hours storage at 25?C. Our data showed that pH of aqueous solution had impact on spectroscopic...

Full description

Saved in:
Bibliographic Details
Published in:Hemijska industrija 2015, Vol.69 (5), p.511-522
Main Authors: Rakic, Violeta, Skrt, Mihaela, Miljkovic, Milena, Kostic, Danijela, Sokolovic, Dusan, Poklar-Ulrih, Natasa
Format: Article
Language:English
Subjects:
anthocyanidins
anthocyanins
Aqueous solutions
Brown index
Color
colour intensity
colour variation
cyanidin
cyanidin 3-glucopyranoside
Stability
UV-Vis absorption spectra
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The colour variation, colour intensity and stability at various pH values (2.0, 4.0, 7.0 and 9.0) of cyanidin 3-O-?-glucopyranoside (Cy3Glc) and its aglycone cyanidin was investigated during a period of 8 hours storage at 25?C. 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 ?C, 99% of Cy3Glc and only 27% of cyanidin remained unchanged. nema
ISSN:0367-598X
2217-7426
DOI:10.2298/HEMIND140711072R