| Issue |
J. Phys. IV France
Volume 137, November 2006
|
|
|---|---|---|
| Page(s) | 309 - 316 | |
| DOI | https://doi.org/10.1051/jp4:2006137060 | |
| Published online | 23 December 2006 | |
J. Bodzenta, M. Dzida and T. Pustelny
J. Phys. IV France 137 (2006) 309-316
DOI: 10.1051/jp4:2006137060
Radiative and nonradiative deexcitation of pigments from natural oils
J. Lukasiewicz1, A. Dudkowiak1, H. Pienkowska2 and D. Frackowiak11 Faculty of Technical Physics, Poznan University of Technology, Nieszawska 13a, 60-965 Poznan, Poland
2 Institute of Technical Development, Warmia and Mazury University, Okrzeji 1a, 10-256 Olsztyn, Poland
(Published online 23 December 2006)
Abstract
The absorption, steady state photoacoustic, fluorescence emission
and excitation spectra of unbleached oils obtained by pressing the
seeds of: evening primrose, borage, rape and viper`s burgloss have
been taken. Results obtained for samples under air and washed by
nitrogen have been compared. In order to establish the occurrence of
the slow thermal processes usually related to very photochemically
active triplet states, the thermal deactivation in the absorption
regions of carotenoids and the pheophytins has been observed at
various frequencies of acting light modulations. The interactions
between oil pigments are discussed. The generation of triplet states
of dyes and singlet oxygen production in oils with different content
of carotenoids and pheophytins is evaluated.
© EDP Sciences 2006