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

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

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.

• Jezik: Angleški jezik
• Ključne besede: anthocyanins, cyanidin, cyanidin 3-O-β-glucopyranoside, color, color stability, hue angle, chroma, lightness
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: BF - Biotehniška fakulteta
• Leto izida: 2021
• Št. strani: Str. 174-182
• Številčenje: Vol 19, no. 1
• PID: 20.500.12556/RUL-134195
• UDK: 547.973:544.35
• ISSN pri članku: 1947-6337
• DOI: 10.1080/19476337.2021.1874539
• COBISS.SI-ID: 49463043
• Datum objave v RUL: 28.12.2021

Gradivo je del revije

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

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
• Začetek licenciranja: 22.02.2021

Sekundarni jezik

• Jezik: Španski jezik
• Naslov: Influencia del pH en la variación del color y la estabilidad de la cianidina y la cianidina 3-O-[beta]-glucopiranósido en solución acuosa
• Ključne besede: barvila, antociani, cianidin, stabilnost raztopin

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P4-0121
• Naslov: Biokemijska in biofizikalno-kemijska karakterizacija naravnih snovi

• Financer: Drugi - Drug financer ali več financerjev
• Program financ.: CEEPUS
• Številka projekta: SI-8402/2010