Abstract
Isomerization of trans-stilbenes is known to be induced by light. The two isomers have distinct absorption, fluorescence excitation and emission spectra. Resveratrol, 3,4′,5-trihydroxystilbene, is a member of the stilbene family. The interest of the scientific community in resveratrol has increased over the last years due to its biomedical properties. Whereas there is a growing confidence that trans-resveratrol is non-toxic, very little is known about the pharmacology of cis-resveratrol. Of this very reason there is considerable interest in knowing the energetics of the trans-cis conversion. Cis-resveratrol is characterized by a large fluorescence quantum yield when compared to trans-resveratrol. In the present paper we report a detailed analysis of the spectral changes induced in trans-resveratrol upon 260 nm excitation for different time periods. Spectral changes have been monitored with UV-visible absorption and steady-state fluorescence spectroscopy at pH 4 at 20, 25, 30, 35, 40, 45 and 50 °C. Continuous 260 nm excitation induces a blue shift in the absorption and fluorescence excitation spectra of resveratrol and a 14 nm blue shift in its fluorescence emission. The photoisomerization yield is reported as a function of 260 nm excitation time. 330 min continuous excitation led to ~60% isomerization yield. The kinetics of trans-cis isomerization has been monitored following the increase in fluorescence quantum yield upon continuous 260 nm excitation of trans-resveratrol. The study was carried out at the above mentioned temperatures in order to obtain the Arrhenius activation energy of photoisomerization. Activation energy and pre-exponential factor were 3.7 ± 0.3 kcal.mol−1 and 10.6 ± 1.6 s−1, respectively. The activation energy is comparable with previously reported values for the photoisomerization of other stilbenes.
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Figueiras, T.S., Neves-Petersen, M.T. & Petersen, S.B. Activation Energy of Light Induced Isomerization of Resveratrol. J Fluoresc 21, 1897–1906 (2011). https://doi.org/10.1007/s10895-011-0886-3
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DOI: https://doi.org/10.1007/s10895-011-0886-3