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Cosmetics 2018, 5(2), 24;

Mechanism of Cuticle Hole Development in Human Hair Due to UV-Radiation Exposure

School of Bioscience and Biotechnology, Tokyo University of Technology, Tokyo 192-0982, Japan
Bionics Program, Tokyo University of Technology Graduate School, Tokyo 192-0982, Japan
Author to whom correspondence should be addressed.
Received: 17 February 2018 / Revised: 18 March 2018 / Accepted: 18 March 2018 / Published: 21 March 2018
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Hair is easily damaged by ultraviolet (UV) radiation, bleaching agents or permanent wave treatments, and as damage progresses, hair loses its gloss, develops split ends and breaks. However, the causes of hair damage due to UV radiation have not yet been clarified. We discovered that in one mechanism facilitating damage to wet hair by UV radiation, the unsaturated fatty acids in wet hair produce hydroxy radicals upon exposure to UV radiation, and these radicals produce cuticle holes between the cuticle layers. In wet hair exposed to UV radiation, cuticle holes were produced only between the cuticle layers, whereas when human hair was immersed in a solution containing hydroxy radicals produced by Fenton’s reaction, a random production of cuticle holes was noted. It is thought that hydroxy radicals are produced only between the cuticle layers by exposure to UV radiation, and cuticle holes are formed only in this region because one of the polyunsaturated fatty acids, linoleic acid, with a bis-allyl hydrogen, is found between the cuticle layers. View Full-Text
Keywords: UV damage; cuticle hole; hydroxy radical; free fatty acids UV damage; cuticle hole; hydroxy radical; free fatty acids

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Maeda, K.; Yamazaki, J.; Okita, N.; Shimotori, M.; Igarashi, K.; Sano, T. Mechanism of Cuticle Hole Development in Human Hair Due to UV-Radiation Exposure. Cosmetics 2018, 5, 24.

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