Caffeine interaction with synthetic flavylium salts. A flash photolysis study for the adduct involving 4′,7-dihydroxyflavylium

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Abstract

The adducts formed between caffeine and three hydroxyflavylium salts (4-methyl-7-hydroxyflavylium, 4′-hydroxyflavylium, and 4′,7-dihydroxyflavylium) are described and the last studied by flash photolysis. A consistent evidence of the caffeine effect on the rate constants of this system is given for the first time. A net hyperchromic effect was only observed for the adduct involving 4′-hydroxyflavylium. The results confirm previous observations that co-pigmentation is essentially a phenomenon that changes the molar fraction distribution of the several species in equilibrium, and not a result of the formation of highly colored charge transfer bands. A simple mathematical model is used to account for the experimental results.

Original languageEnglish
Pages (from-to)51-59
Number of pages9
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume117
Issue number1
DOIs
Publication statusPublished - 14 Aug 1998

Keywords

  • 4′,7-Dihydroxyflavylium
  • Adducts
  • Caffeine

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