TPP and singlet oxygen quenching by carotene in solution

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

TPP and singlet oxygen quenching by carotene in solution

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

TPP and singlet oxygen quenching by carotene in solution

Popis výsledku anglicky

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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BH - Optika, masery a lasery

OECD FORD obor

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Projekt

—

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2011

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Molecular Structure

ISSN

0022-2860

e-ISSN

—

Svazek periodika

993

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

3

Strana od-do

474-476

Kód UT WoS článku

000291066000076

EID výsledku v databázi Scopus

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