TPP and singlet oxygen quenching by carotene in solution

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F11%3A10090073" target="_blank" >RIV/00216208:11320/11:10090073 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1016/j.molstruc.2010.11.030" target="_blank" >http://dx.doi.org/10.1016/j.molstruc.2010.11.030</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.molstruc.2010.11.030" target="_blank" >10.1016/j.molstruc.2010.11.030</a>

Result language
angličtina
Original language name
TPP and singlet oxygen quenching by carotene in solution
Original language description
Antioxidant properties of naturally occurring species, beta-carotene, are investigated by examining its ability to quench singlet oxygen ((1)O(2)) and triplet states of photosensitizer 5,10,15,20-tetraphenyl-porphin (TPP) in tetrahydrofuran solutions. Concentrations of all species are biologically relevant. The quenching is evaluated using direct spectral- and temporal-resolved detection of weak near-infrared phosphorescence of both triplet TPP ((3)TPP) and (1)O(2). Dependencies of lifetimes of 3TPP and(1)O(2) on concentration of beta-carotene were established as well as quenching rate constants for beta-carotene. Hypothesis of multicomponent (3)TPP is proposed and investigated. Quenching constant of (10.9 +/- 0.5) x 10(9) M(-1) s(-1) for bimolecularquenching of (1)O(2) by beta-carotene and quenching constant of (8 +/- 3) x 10(9) M(-1) s(-1) for bimolecular quenching of (3)TPP longer lived component were determined.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BH - Optics, masers and lasers
OECD FORD branch
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Publication year
2011
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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