(E)-3-(4-methoxyphenyl) prop-2-enoic acid 2-ethylhexyl ester
3D model (JSmol)
|Molar mass||290.40 g·mol−1|
|Melting point||−25 °C (−13 °F; 248 K)|
|Boiling point||198 to 200 °C (388 to 392 °F; 471 to 473 K)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Octyl methoxycinnamate or ethylhexyl methoxycinnamate (INCI) or octinoxate (USAN), trade names Eusolex 2292 and Uvinul MC80, is an organic compound that is an ingredient in some sunscreens and lip balms. It is an ester formed from methoxycinnamic acid and (RS)-2-ethylhexanol. It is a clear liquid that is insoluble in water.
One study performed in 2000 raised safety concerns about octyl methoxycinnamate by demonstrating toxicity to mouse cells at concentrations lower than typical levels in sunscreens. However, another study concluded that octyl methoxycinnamate and other sun screening agents do not penetrate the outer skin in sufficient concentration to cause any significant toxicity to the underlying human keratinocytes. Estrogenic and neurological effects were noted in laboratory animals at concentrations close to those experienced by sunscreen users and were also shown in vitro. Octyl methoxycinnamate has been shown to be light sensitive with a decrease in UV absorption efficiency upon light exposure. This degradation causes formation of the Z-octyl-p-methoxycinnamate from the E-octyl-p-methoxycinnamate. In contrast, the OMC does not show degradation when kept in darkness for extended periods of time.
A study carried out in 2017 by the Research Centre for Toxic Compounds in the Environment at Masaryk University, Czech Republic, indicates that octyl methoxycinnamate (EHMC) may damage human cell DNA. When exposed to sun rays, the spatial arrangement of its molecules changes and isomerisation takes place. While until now only unchanged EHMC has been researched, Massaryk University researchers focused on its isomers and found out that it has a significant genotoxic effect under lab conditions. It means that it may potentially damage human DNA and cause genome mutations which may lead to serious health risks.
- Amiloxate, a chemically related sunscreening agent
- Cinoxate, another cinnamic acid based sunscreen ingredient
- Sunscreen controversy
- Merck Index, 11th Edition, 6687.
- Serpone, Nick; Salinaro, Angela; Emeline, Alexei V.; Horikoshi, Satoshi; Hidaka, Hisao; Zhao, Jincai (2002). "An in vitro systematic spectroscopic examination of the photostabilities of a random set of commercial sunscreen lotions and their chemical UVB/UVA active agents". Photochemical & Photobiological Sciences. 1 (12): 970–81. PMID 12661594. doi:10.1039/B206338G.
- Sinister side of sunscreens, Rob Edwards, New Scientist, 7 October 2000[medical citation needed]
- Butt, S.T.; Christensen, T. (2000). "Toxicity and Phototoxicity of Chemical Sun Filters". Radiation Protection Dosimetry. 91: 283–6. doi:10.1093/oxfordjournals.rpd.a033219. INIST:1532995.
- Hayden, C.G.J.; Cross, S.E.; Anderson, C.; Saunders, N.A.; Roberts, M.S. (2005). "Sunscreen Penetration of Human Skin and Related Keratinocyte Toxicity after Topical Application". Skin Pharmacology and Physiology. 18 (4): 170–4. PMID 15908756. doi:10.1159/000085861.
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- Axelstad, Marta; Boberg, Julie; Hougaard, Karin Sørig; Christiansen, Sofie; Jacobsen, Pernille Rosenskjold; Mandrup, Karen Riiber; Nellemann, Christine; Lund, Søren Peter; Hass, Ulla (2011). "Effects of pre- and postnatal exposure to the UV-filter Octyl Methoxycinnamate (OMC) on the reproductive, auditory and neurological development of rat offspring". Toxicology and Applied Pharmacology. 250 (3): 278–90. PMID 21059369. doi:10.1016/j.taap.2010.10.031.
- Sharma, Anežka; Bányiová, Katarína; Babica, Pavel; El Yamani, Naouale; Collins, Andrew Richard; Čupr, Pavel (2017). "Different DNA damage response of cis and trans isomers of commonly used UV filter after the exposure on adult human liver stem cells and human lymphoblastoid cells". Science of the Total Environment. 593-594: 18–26. PMID 28340478. doi:10.1016/j.scitotenv.2017.03.043.