Internal Structural Changes in Age-Related Curved Hair Due to Cyclical Extension: An IR Spectroscopy Study

    January 2025 in “ International Journal of Cosmetic Science ”
    Naoya Fuse, Yukako Matsue, Shigeaki Morita
    TLDR Age-related hair curvature increases due to internal structural changes from grooming.
    The study investigates internal structural changes in age-related curved hair due to cyclical extension, identifying three key transformation steps. Initially, there is a surface transfer of internal lipids, followed by two distinct patterns of disulfide bond cleavage: C-S and S-S fission. The final step involves the transformation of unravelled α-helices into β-structures, occurring above approximately 225 stretched. These findings suggest that understanding these processes can help manage the increase in hair curvature caused by everyday grooming.
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