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Spectroscopic Evidence for Photooxidation of Tocopherols in n-Hexane

This paper presents the results of an investigation into the photooxidation of tocopherols (Tocs) dissolved in argonated and non-argonated n-hexane. During irradiation, steady-state absorption and fluorescence spectra as well as lifetimes were measured. In all experiments, the photoreactions were of...

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Autor principal: Smyk, Bogdan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7865854/
https://www.ncbi.nlm.nih.gov/pubmed/33499107
http://dx.doi.org/10.3390/molecules26030571
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author Smyk, Bogdan
author_facet Smyk, Bogdan
author_sort Smyk, Bogdan
collection PubMed
description This paper presents the results of an investigation into the photooxidation of tocopherols (Tocs) dissolved in argonated and non-argonated n-hexane. During irradiation, steady-state absorption and fluorescence spectra as well as lifetimes were measured. In all experiments, the photoreactions were of the first order type. The reaction rate was higher for all Tocs in argonated solvent. A new emission band with a maximum at 298 nm as well as new absorption and fluorescence bands beyond the 300 nm connected with charge-transfer (C-T) complexes for all Tocs appeared during the irradiation of γ- and δ-Toc. The above results indicate that the photooxidation process is very complex and that the observed phenomena strongly depend on the number and position of methyl groups in the chromanol ring.
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spelling pubmed-78658542021-02-07 Spectroscopic Evidence for Photooxidation of Tocopherols in n-Hexane Smyk, Bogdan Molecules Article This paper presents the results of an investigation into the photooxidation of tocopherols (Tocs) dissolved in argonated and non-argonated n-hexane. During irradiation, steady-state absorption and fluorescence spectra as well as lifetimes were measured. In all experiments, the photoreactions were of the first order type. The reaction rate was higher for all Tocs in argonated solvent. A new emission band with a maximum at 298 nm as well as new absorption and fluorescence bands beyond the 300 nm connected with charge-transfer (C-T) complexes for all Tocs appeared during the irradiation of γ- and δ-Toc. The above results indicate that the photooxidation process is very complex and that the observed phenomena strongly depend on the number and position of methyl groups in the chromanol ring. MDPI 2021-01-22 /pmc/articles/PMC7865854/ /pubmed/33499107 http://dx.doi.org/10.3390/molecules26030571 Text en © 2021 by the author. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Smyk, Bogdan
Spectroscopic Evidence for Photooxidation of Tocopherols in n-Hexane
title Spectroscopic Evidence for Photooxidation of Tocopherols in n-Hexane
title_full Spectroscopic Evidence for Photooxidation of Tocopherols in n-Hexane
title_fullStr Spectroscopic Evidence for Photooxidation of Tocopherols in n-Hexane
title_full_unstemmed Spectroscopic Evidence for Photooxidation of Tocopherols in n-Hexane
title_short Spectroscopic Evidence for Photooxidation of Tocopherols in n-Hexane
title_sort spectroscopic evidence for photooxidation of tocopherols in n-hexane
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7865854/
https://www.ncbi.nlm.nih.gov/pubmed/33499107
http://dx.doi.org/10.3390/molecules26030571
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