Intermolecular Copigmentation of Malvidin-3- O-glucoside with Caffeine in Water: The Effect of the Copigment on the pH-Dependent Reversible and Irreversible Processes

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
9 Downloads (Pure)

Abstract

Intermolecular copigmentation of malvidin-3-O-glucoside with caffeine was studied using a holistic procedure that includes the extension to basic pH values. In moderately basic solutions (7.5 < pH < 9.5) and independently of the copigment presence, there is a pH region where degradation of the quinoidal base and anionic quinoidal bases is faster than hydration and OH-nucleophilic addition, preventing the system from reaching the equilibrium. Intermolecular copigmentation with caffeine reduces significantly the degradation rate of quinoidal bases. In a more basic medium, the equilibrium is reached and degradation occurs from the anionic chalcones. In this case, the addition of caffeine also reduces the degradation rate in the interval 10 < pH < 11.5.

Original languageEnglish
Pages (from-to)25502-25509
Number of pages8
JournalACS Omega
Volume7
Issue number29
DOIs
Publication statusPublished - 26 Jul 2022

Keywords

  • Malvidin
  • Anthocyanins
  • Pigments

Fingerprint

Dive into the research topics of 'Intermolecular Copigmentation of Malvidin-3- O-glucoside with Caffeine in Water: The Effect of the Copigment on the pH-Dependent Reversible and Irreversible Processes'. Together they form a unique fingerprint.

Cite this