TY - JOUR
T1 - Fluorescence of zeaxanthin and violaxanthin in aggregated forms
AU - Gruszecki, Wieslaw I.
AU - Zelent, Bogumil
AU - Leblanc, Roger M.
N1 - Funding Information:
This work has been supported by the Natural Sciences and Engineering Research Council of Canada. WIG thanks the Universite du Quebec a Trois-Rivieres for a visiting professorship. The authors would like to thank Dr. Surat Hotchandani of our laboratory for many fruitful discussions on this paper.
Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 1990/8/17
Y1 - 1990/8/17
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0001569553&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0001569553&partnerID=8YFLogxK
U2 - 10.1016/0009-2614(90)85264-D
DO - 10.1016/0009-2614(90)85264-D
M3 - Article
AN - SCOPUS:0001569553
VL - 171
SP - 563
EP - 568
JO - Chemical Physics Letters
JF - Chemical Physics Letters
SN - 0009-2614
IS - 5-6
ER -