Influence of pH on color variation and stability of cyanidin and cyanidin 3-O-[beta]-glucopyranoside in aqueous solution

Rakić, Violeta (author), Poklar Ulrih, Nataša (author)

Changes in color and color stability of cyanidin and cyanidin 3-O-β-glucopyranoside (Cy3Glc) in aqueous solutions were investigated at pHs from 0.5 to 13.1, by combination of colorimetry and spectrophotometry. The glucosidic substitution at C-3 of cyanidin (i.e., Cy3Glc), moved the tonalities toward the yellow pole of the chromatic circle, which resulted in high Chroma increases and a hypsochromically shifted visible absorbance maximum (λmax-vis). Under the most acidic and alkaline conditions, cyanidin showed greater Lightness compared with the rest of the pH range. At these extreme pHs, the lower Lightness of Cy3Glc was coupled with a high Chroma value. As a consequence, Cy3Glc showed its most intense color under the most acidic and alkaline conditions, and did not show visually perceptible color at neutral pH. At pH <3 and from pH 10 to11 cyanidin had lower color stability than Cy3Glc. We show the correlations between the data for these color and stability variations for cyanidin and Cy3Glc over the entire pH range.

• Language: English
• Keywords: anthocyanins, cyanidin, cyanidin 3-O-β-glucopyranoside, color, color stability, hue angle, chroma, lightness
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Year: 2021
• Number of pages: Str. 174-182
• Numbering: Vol 19, no. 1
• PID: 20.500.12556/RUL-134195
• UDC: 547.973:544.35
• ISSN on article: 1947-6337
• DOI: 10.1080/19476337.2021.1874539
• COBISS.SI-ID: 49463043
• Publication date in RUL: 28.12.2021

Record is a part of a journal

• Title: CYTA: journal of food
• Publisher: Taylor & Francis
• ISSN: 1947-6337
• COBISS.SI-ID: 517521433

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 22.02.2021

Secondary language

• Language: Spanish
• Title: Influencia del pH en la variación del color y la estabilidad de la cianidina y la cianidina 3-O-[beta]-glucopiranósido en solución acuosa
• Keywords: barvila, antociani, cianidin, stabilnost raztopin

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P4-0121
• Name: Biokemijska in biofizikalno-kemijska karakterizacija naravnih snovi

• Funder: Other - Other funder or multiple funders
• Funding programme: CEEPUS
• Project number: SI-8402/2010