Effect of Heat Treatment on Human Hair Keratin Film

    September 2013 in “ 日本香粧品学会誌 ”
    Toshihiro Fujii, Yuka Takashima, Shunsuke Takayama, Yumiko Ito, Tomoyuki Kawasoe
    The study investigated the effects of heat treatment on human hair keratin films and hair samples, focusing on color change, morphology, protein solubility, and oxidative proteins. It was found that keratin films changed color from opaque white to yellow/light brown at temperatures above 170°C, with little morphological change observed even at 200°C. Protein solubility decreased with increased heating time and temperature, showing a linear relationship between solubilized proteins and temperatures from 110 to 160°C. The keratin films exhibited more pronounced changes compared to hair samples, with increased carbonylated proteins at 120–180°C, suggesting that heat promotes protein oxidation and the formation of a "Stable Structure." The study concluded that keratin films could be used to quantitatively evaluate hair thermal damage.
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