Excited-State Evolution of Keto-Carotenoids after Excess Energy Excitation in the UV Region

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F21%3A43903231" target="_blank" >RIV/60076658:12310/21:43903231 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60077344:_____/21:00548236

Výsledek na webu

<a href="https://chemistry-europe.onlinelibrary.wiley.com/doi/epdf/10.1002/cphc.202000982" target="_blank" >https://chemistry-europe.onlinelibrary.wiley.com/doi/epdf/10.1002/cphc.202000982</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/cphc.202000982" target="_blank" >10.1002/cphc.202000982</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Excited-State Evolution of Keto-Carotenoids after Excess Energy Excitation in the UV Region

Popis výsledku v původním jazyce

Carotenoids are molecules with rich photophysics that are in many biological systems involved in photoprotection. Yet, their response to excess energy excitation is only scarcely studied. Here we have explored excited state properties of three keto-carotenoids, echinenone, canthaxanthin and rhodoxanthin after excess energy excitation to a singlet state absorbing in UV. Though the basic spectral features and kinetics of S-2, hot S-1, relaxed S-1 states remain unchanged upon UV excitation, the clear increase of the S* signal is observed after excess energy excitation, associated with increased S* lifetime. A multiple origin of the S* signal, originating either from specific conformations in the S-1 state or from a non-equilibrated ground state, is confirmed in this work. We propose that the increased amount of energy stored in molecular vibrations, induced by the UV excitation, is the reason for the enhanced S* signal observed after UV excitation. Our data also suggest that a fraction of the UV excited state population may proceed through a non-sequential pathway, bypassing the S-2 state.

Název v anglickém jazyce

Excited-State Evolution of Keto-Carotenoids after Excess Energy Excitation in the UV Region

Popis výsledku anglicky

Carotenoids are molecules with rich photophysics that are in many biological systems involved in photoprotection. Yet, their response to excess energy excitation is only scarcely studied. Here we have explored excited state properties of three keto-carotenoids, echinenone, canthaxanthin and rhodoxanthin after excess energy excitation to a singlet state absorbing in UV. Though the basic spectral features and kinetics of S-2, hot S-1, relaxed S-1 states remain unchanged upon UV excitation, the clear increase of the S* signal is observed after excess energy excitation, associated with increased S* lifetime. A multiple origin of the S* signal, originating either from specific conformations in the S-1 state or from a non-equilibrated ground state, is confirmed in this work. We propose that the increased amount of energy stored in molecular vibrations, induced by the UV excitation, is the reason for the enhanced S* signal observed after UV excitation. Our data also suggest that a fraction of the UV excited state population may proceed through a non-sequential pathway, bypassing the S-2 state.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10610 - Biophysics

Projekt

<a href="/cs/project/GX19-28323X" target="_blank" >GX19-28323X: Vztah mezi strukturou a funkcí karotenoidů: Nové cesty k řešení nezodpovězených otázek</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

ChemPhysChem

ISSN

1439-4235

e-ISSN

—

Svazek periodika

22

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

471-480

Kód UT WoS článku

000613850200001

EID výsledku v databázi Scopus

2-s2.0-85100199114