Laura MacManus-Spencer - Aqueous Photolysis of the Organic Ultraviolet Filter Chemical Octyl Methoxycinnamate.

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      Publication Details (including relevant citation   information): MacManus-Spencer, Laura A., Tse, Monica   L., Klein, Jacob L., Kracunas, Alison E., Environ. Sci.   Technol., 2011, 45 (9), pp   3931-3937

      Abstract: Org. UV filter chems. are the active   ingredients in personal care products designed to protect the   skin from UV radiation, and hundreds of tons are estd. to be   produced annually. Despite their entrance into the aquatic   environment by both direct and indirect routes and their   detection in surface waters and fish, little is known about their   environmental fate. UV filter chems. are designed to be   photostable, but some undergo transformation upon exposure to UV   light. Octyl methoxycinnamate (OMC), a commonly used UV filter   chem., degrades rapidly by direct photolysis; previous studies   have focused on its photoisomerization, and a few investigators   have reported the formation of cyclodimers. We present the   kinetics and quantum efficiency of the direct photolysis of OMC   and confirm that dimerization occurs as a result of direct   photolysis in aq. solns. Likely identities of the dimers are   offered based on comparison to reported results for other   cinnamate derivs. We identified addnl. products of direct   photolysis that have not been previously reported and studied   their photostability, as well as the mechanism of product   formation. There is also some evidence of indirect photolysis in   the presence of dissolved natural org. matter. [on SciFinder(R)]

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