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Journal of Biomedical Optics

Lycopene is more potent than beta carotene in the neutralization of singlet oxygen: role of energy transfer probed by ultrafast Raman spectroscopy
Author(s): Kong-Thon Tsen; Shaw-Wei D. Tsen; Juliann G. Kiang
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Paper Abstract

Energy transfer processes between beta carotene, lycopene, and singlet oxygen (1O2) have been studied by ultrafast Raman spectroscopy. Our experimental results demonstrate that during the neutralization of singlet oxygen by beta carotene the excitation energy of singlet oxygen is transferred directly to the first excited electronic state S1 of beta carotene. In contrast, the excitation energy of singlet oxygen is transferred directly to the ground excited vibronic state S0 of lycopene. Our data not only provide the first direct experimental elucidation of energy transfer processes in such important biological systems but also help explain why lycopene is a more potent antioxidant than beta carotene in the neutralization of singlet oxygen.

Paper Details

Date Published: 1 November 2006
PDF: 6 pages
J. Biomed. Opt. 11(6) 064025 doi: 10.1117/1.2398884
Published in: Journal of Biomedical Optics Volume 11, Issue 6
Show Author Affiliations
Kong-Thon Tsen, Arizona State Univ. (United States)
Shaw-Wei D. Tsen, Johns Hopkins Univ. (United States)
Juliann G. Kiang, Walter Reed Army Institute of Research (United States)


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