Morphological Changes in Semi-Permanent Dyed Hair Due to UV-A Radiation
January 2014
in “
한국미용학회지
”
New to Keratin? There is a guide in the encyclopedia. Read the guide → Studysummary This study observed that long-term UV-A exposure and semi-permanent dye treatment can cause significant structural damage to human hair, particularly affecting the cuticle and cortex layers. Our plain-language summary of this paper — not a Tressless recommendation.
The study examined the effects of UV-A radiation on semi-permanent dyed human hair, revealing significant damage to the hair structure after 600 hours of exposure. The cuticle layer showed degradation, thinning, and cavity formation, while the cortex layer exhibited cavities between cortical cells and melanin granules. The research suggested that UV exposure leads to the generation of free radicals, oxidation of keratin and melanin, cleavage of cystine bonds, and formation of cysteic acid, resulting in hair damage. The findings emphasized the importance of recognizing and managing photo-damage to maintain healthy hair.
