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The photoisomerization of the sunscreen ethylhexyl p-methoxy cinnamate and its influence on the sun protection factor

Paper ID Volume ID Publish Year Pages File Format Full-Text
28518 44079 2007 6 PDF Available
Title
The photoisomerization of the sunscreen ethylhexyl p-methoxy cinnamate and its influence on the sun protection factor
Abstract

The photoisomerization of the sun filter ethylhexyl p-methoxycinnamate (OMC) was studied under various conditions, (i) by irradiating diluted solutions using various solvents, (ii) by irradiating thin layers of concentrated solutions in non-volatile solvents, and (iii) by irradiating thinly applied commercial sunscreen products. The spectroscopic characteristics of the Z isomer were determined, along with its response factor in HPLC analysis. The ratio of the two isomers was measured under each condition of irradiation. The incidence of photoisomerization in the sun protection factor (SPF) was evaluated on the basis of calculations deduced from the concept of irregular film developed by O’Neill. The decrease in SPF, which can exceed 30%, is primarily dependent upon the rate of isomerization of OMC but also on the composition of sunscreen products. As isomerization of OMC is rapid and its rate unpredictable, it is in theory impossible to obtain good correlation between measurements of SPF in vivo and those in vitro, if measurements in vitro are not preceded by the process of irradiation precipitating isomerization of OMC.

Keywords
Octyl methoxycinnamate; Sunscreen; Photoisomerization; Sun protection factor
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The photoisomerization of the sunscreen ethylhexyl p-methoxy cinnamate and its influence on the sun protection factor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 186, Issue 1, 5 February 2007, Pages 65–70
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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