About: TPP and singlet oxygen quenching by carotene in solution

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
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)
Title	TPP and singlet oxygen quenching by carotene in solution TPP and singlet oxygen quenching by carotene in solution (en)
skos:prefLabel	TPP and singlet oxygen quenching by carotene in solution TPP and singlet oxygen quenching by carotene in solution (en)
skos:notation	RIV/00216208:11320/11:10090073!RIV12-MSM-11320___
http://linked.open...avai/riv/aktivita	Z
http://linked.open...avai/riv/aktivity	Z(MSM0021620835)
http://linked.open...iv/cisloPeriodika	1-3
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Dědic, Roman Svoboda, Antonín Hála, Jan Scholz, Marek
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	235671
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/11:10090073
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Quenching; Singlet oxygen; TPP; beta-Carotene (en)
http://linked.open.../riv/klicoveSlovo	Quenching beta-Carotene Singlet oxygen TPP
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[9EB01FCAFCC4]
http://linked.open...i/riv/nazevZdroje	Journal of Molecular Structure
http://linked.open...in/vavai/riv/obor	BH
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...UplatneniVysledku	2011
http://linked.open...v/svazekPeriodika	993
http://linked.open...iv/tvurceVysledku	Svoboda, Antonín Dědic, Roman Hála, Jan Scholz, Marek
http://linked.open...ain/vavai/riv/wos	000291066000076
http://linked.open...n/vavai/riv/zamer	Fyzika molekulárních, makromolekulárních a biologických systémů
issn	0022-2860
number of pages	3 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.molstruc.2010.11.030
http://localhost/t...ganizacniJednotka	11320

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