Chemistry of carotenoid neutral radicals
| Autor: | A. Ligia Focsan, Adam Magyar, Lowell D. Kispert |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Quenching (fluorescence)
Free Radicals Light Photosystem II Chemistry Radical Electron Spin Resonance Spectroscopy Biophysics Photochemistry Carotenoids Biochemistry law.invention Zeaxanthin chemistry.chemical_compound Deprotonation Radical ion law Photoprotection Electrochemistry Quantum Theory Electron paramagnetic resonance Molecular Biology |
| Zdroj: | Archives of Biochemistry and Biophysics. 572:167-174 |
| ISSN: | 0003-9861 |
| DOI: | 10.1016/j.abb.2015.02.005 |
| Popis: | Proton loss from the carotenoid radical cations (Car(+)) to form neutral radicals (#Car) was investigated by numerous electrochemical, EPR, ENDOR and DFT studies described herein. The radical cation and neutral radicals were formed in solution electrochemically and stabilized on solid silica-alumina and MCM-41 matrices. Carotenoid neutral radicals were recently identified in Arabidopsis thaliana plant and photosystem II samples. Deprotonation at the terminal ends of a zeaxanthin radical cation could provide a secondary photoprotection pathway which involves quenching excited state chlorophyll by the long-lived zeaxanthin neutral radicals formed. |
| Databáze: | OpenAIRE |
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