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Insights into the photoprotection mechanism of the UV filter homosalate
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Holt, Emily L., Krokidi, Konstantina M., Turner, Matthew A. P., Mishra, Piyush, Zwier, Timothy S., Rodrigues, Natércia D. N. and Stavros, Vasilios G. (2020) Insights into the photoprotection mechanism of the UV filter homosalate. Physical Chemistry Chemical Physics, 22 (27). pp. 15509-15519. doi:10.1039/D0CP02610G ISSN 1463-9076.
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WRAP-Insights-photoprotection-mechanism-UV-homosalate-Stavros-2020.pdf - Accepted Version - Requires a PDF viewer. Download (5Mb) | Preview |
Official URL: https://doi.org/10.1039/D0CP02610G
Abstract
Homosalate (HMS) is a salicylate molecule that is commonly included within commercial sunscreen formulations to provide protection from the adverse effects of ultraviolet (UV) radiation exposure. In the present work, the mechanisms by which HMS provides UV photoprotection are unravelled, using a multi-pronged approach involving a combination of time-resolved ultrafast laser spectroscopy in the gas-phase and in solution, laser-induced fluorescence, steady-state absorption spectroscopy, and computational methods. The unique combination of these techniques allow us to show that the enol tautomer of HMS undergoes ultrafast excited state intramolecular proton transfer (ESIPT) upon photoexcitation in the UVB (290–320 nm) region; once in the keto tautomer, the excess energy is predominantly dissipated non-radiatively. Sharp transitions are observed in the LIF spectrum at close-to-origin excitation energies, which points towards the potential presence of a second conformer that does not undergo ESIPT. These studies demonstrate that, overall, HMS exhibits mostly favourable photophysical characteristics of a UV filter for inclusion in sunscreen formulations.
Item Type: | Journal Article | ||||||||||||||||||
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Subjects: | Q Science > QD Chemistry | ||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Salicylates, Sunscreens (Cosmetics), Ultraviolet radiation | ||||||||||||||||||
Journal or Publication Title: | Physical Chemistry Chemical Physics | ||||||||||||||||||
Publisher: | Royal Society of Chemistry | ||||||||||||||||||
ISSN: | 1463-9076 | ||||||||||||||||||
Official Date: | 21 July 2020 | ||||||||||||||||||
Dates: |
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Volume: | 22 | ||||||||||||||||||
Number: | 27 | ||||||||||||||||||
Page Range: | pp. 15509-15519 | ||||||||||||||||||
DOI: | 10.1039/D0CP02610G | ||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||
Date of first compliant deposit: | 16 June 2020 | ||||||||||||||||||
Date of first compliant Open Access: | 30 June 2021 | ||||||||||||||||||
RIOXX Funder/Project Grant: |
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