Fluorescence of zeaxanthin and violaxanthin in aggregated forms

Wieslaw I. Gruszecki, Bogumil Zelent, Roger M. Leblanc

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Abstract

The fluorescence emission, the absorption, and the fluorescence excitation spectra of zeaxanthin (Z) and violaxanthin (V) aggregates formed in a water-ethanol solvent system have been measured. Fluorescence quantum yield for zeaxanthin and violaxanthin are: φ{symbol}F(Z) = 4.3 × 10-4 and φ{symbol}F(V) = 1.7 × 10-3. The fluorescence lifetimes are τF(Z) = 1.06 ± 0.07 ns and τF(V) = 0.90 ± 0.10 ns. The calculated natural radiative lifetimes, τ0(Z) = 2.6 × 10-6 s and τ0(V) = 5.3 × 10-7 s correspond well to the literature values estimated for 1A*g state of β-carotene by indirect measurements. The energy of the 1A*g state of the carotenoid aggregates has been measured as 17860 cm-1. The fluorescence of these carotenoid aggregates is related to the radiative deactivation of both the 1Bu electronic singlet state and the symmetrically forbidden lowest excited electronic singlet state 1A*g.

Original languageEnglish (US)
Pages (from-to)563-568
Number of pages6
JournalChemical Physics Letters
Volume171
Issue number5-6
DOIs
StatePublished - Aug 17 1990
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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