Time-resolved Luminescence and Singlet Oxygen Formation After Illumination of the Hypericin-Low-density Lipoprotein Complex

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F09%3A00206345" target="_blank" >RIV/00216208:11320/09:00206345 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Time-resolved Luminescence and Singlet Oxygen Formation After Illumination of the Hypericin-Low-density Lipoprotein Complex

Popis výsledku v původním jazyce

Time-resolved fluorescence and phosphorescence study of hypericin (Hyp) in complex with low-density lipoproteins (LDL) as well as the evolution of singlet oxygen formation and annihilation after illumination of Hyp LDL complexes at room temperature are presented in this work. The observed shortening of the fluorescence lifetime of Hyp at high Hyp LDL molar ratios (}25:1) proves the self-quenching of the excited singlet state of monomeric Hyp at these concentration ratios. The very short lifetime (_0.5 ns) of Hyp fluorescence at very high Hyp LDL ratios (}150:1) suggests that at high local Hyp concentration inside LDL molecules fast and ultrafast nonradiative decay processes from excited singlet state of Hyp become more important. Contrary to the lifetime of the singlet excited state, the lifetime (its shorter component) of Hyp phosphorescence is not dependent on Hyp LDL ratio in the studied concentration range.

Název v anglickém jazyce

Time-resolved Luminescence and Singlet Oxygen Formation After Illumination of the Hypericin-Low-density Lipoprotein Complex

Popis výsledku anglicky

Time-resolved fluorescence and phosphorescence study of hypericin (Hyp) in complex with low-density lipoproteins (LDL) as well as the evolution of singlet oxygen formation and annihilation after illumination of Hyp LDL complexes at room temperature are presented in this work. The observed shortening of the fluorescence lifetime of Hyp at high Hyp LDL molar ratios (}25:1) proves the self-quenching of the excited singlet state of monomeric Hyp at these concentration ratios. The very short lifetime (_0.5 ns) of Hyp fluorescence at very high Hyp LDL ratios (}150:1) suggests that at high local Hyp concentration inside LDL molecules fast and ultrafast nonradiative decay processes from excited singlet state of Hyp become more important. Contrary to the lifetime of the singlet excited state, the lifetime (its shorter component) of Hyp phosphorescence is not dependent on Hyp LDL ratio in the studied concentration range.

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

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2009

Kód důvěrnosti údajů

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

Název periodika

Photochemistry and Protobiology

ISSN

0031-8655

e-ISSN

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Svazek periodika

2009

Číslo periodika v rámci svazku

85

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

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Kód UT WoS článku

000265431300023

EID výsledku v databázi Scopus

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