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Statements

Subject Item
n2:RIV%2F00216208%3A11320%2F11%3A10090073%21RIV12-MSM-11320___
rdf:type
n7:Vysledek skos:Concept
dcterms: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.
dcterms:title
TPP and singlet oxygen quenching by carotene in solution TPP and singlet oxygen quenching by carotene in solution
skos:prefLabel
TPP and singlet oxygen quenching by carotene in solution TPP and singlet oxygen quenching by carotene in solution
skos:notation
RIV/00216208:11320/11:10090073!RIV12-MSM-11320___
n7:predkladatel
n19:orjk%3A11320
n3:aktivita
n15:Z
n3:aktivity
Z(MSM0021620835)
n3:cisloPeriodika
1-3
n3:dodaniDat
n13:2012
n3:domaciTvurceVysledku
n12:8071446 n12:7004133 n12:9749713 n12:1133268
n3:druhVysledku
n17:J
n3:duvernostUdaju
n14:S
n3:entitaPredkladatele
n5:predkladatel
n3:idSjednocenehoVysledku
235671
n3:idVysledku
RIV/00216208:11320/11:10090073
n3:jazykVysledku
n9:eng
n3:klicovaSlova
Quenching; Singlet oxygen; TPP; beta-Carotene
n3:klicoveSlovo
n8:Quenching n8:beta-Carotene n8:Singlet%20oxygen n8:TPP
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[9EB01FCAFCC4]
n3:nazevZdroje
Journal of Molecular Structure
n3:obor
n20:BH
n3:pocetDomacichTvurcuVysledku
4
n3:pocetTvurcuVysledku
4
n3:rokUplatneniVysledku
n13:2011
n3:svazekPeriodika
993
n3:tvurceVysledku
Scholz, Marek Svoboda, Antonín Dědic, Roman Hála, Jan
n3:wos
000291066000076
n3:zamer
n18:MSM0021620835
s:issn
0022-2860
s:numberOfPages
3
n11:doi
10.1016/j.molstruc.2010.11.030
n10:organizacniJednotka
11320