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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 bimolecular quenching 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.
- 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 bimolecular quenching 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. (en)
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Title
| - TPP and singlet oxygen quenching by carotene in solution
- TPP and singlet oxygen quenching by carotene in solution (en)
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skos:prefLabel
| - TPP and singlet oxygen quenching by carotene in solution
- TPP and singlet oxygen quenching by carotene in solution (en)
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skos:notation
| - RIV/00216208:11320/11:10090073!RIV12-MSM-11320___
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http://linked.open...avai/riv/aktivita
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http://linked.open...avai/riv/aktivity
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http://linked.open...iv/cisloPeriodika
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http://linked.open...vai/riv/dodaniDat
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http://linked.open...aciTvurceVysledku
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http://linked.open.../riv/druhVysledku
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http://linked.open...iv/duvernostUdaju
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http://linked.open...titaPredkladatele
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http://linked.open...dnocenehoVysledku
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http://linked.open...ai/riv/idVysledku
| - RIV/00216208:11320/11:10090073
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http://linked.open...riv/jazykVysledku
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http://linked.open.../riv/klicovaSlova
| - Quenching; Singlet oxygen; TPP; beta-Carotene (en)
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http://linked.open.../riv/klicoveSlovo
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http://linked.open...odStatuVydavatele
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http://linked.open...ontrolniKodProRIV
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http://linked.open...i/riv/nazevZdroje
| - Journal of Molecular Structure
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http://linked.open...in/vavai/riv/obor
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http://linked.open...ichTvurcuVysledku
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http://linked.open...cetTvurcuVysledku
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http://linked.open...UplatneniVysledku
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http://linked.open...v/svazekPeriodika
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http://linked.open...iv/tvurceVysledku
| - Svoboda, Antonín
- Dědic, Roman
- Hála, Jan
- Scholz, Marek
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http://linked.open...ain/vavai/riv/wos
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http://linked.open...n/vavai/riv/zamer
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issn
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number of pages
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http://bibframe.org/vocab/doi
| - 10.1016/j.molstruc.2010.11.030
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http://localhost/t...ganizacniJednotka
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