J. Phys. IV France
Volume 137, November 2006
Page(s) 309 - 316
Publié en ligne 23 décembre 2006
35th Winter School on Wave and Quantum Acoustics
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. Frackowiak1

1  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)

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