610 JOURNAL OF COSMETIC SCIENCE increased from root to tips, but there was significant variation between panelists, even at roots where damage was lowest. This variability was shown in part to be driven by internal lipid levels, but it is proposed other differences (i.e., curl level, protein composition, etc.) may be driving this variability. ACKNOWLEDGMENTS The authors would like to thank The Procter & Gamble Company for support of this work. REFERENCES (1) M. Feughelman, Natural protein fibers, J. Appl. Polym. Sci., 83(3), 489–507 (2002). (2) T. Evans, “Hair Breakage,” in Practical Modern Hair Science, T. Evans and R. R. Wickett. Eds. (Allured Business Media, Carol Stream, IL, 2002), pp. 251–294. (3) C. Robbins, Chemical and Physical Behavior of Human Hair, 5th Ed. (Springer-Verlag, Berlin, 2012), pp. 537–562. (4) T. A. Evans and K. A. Park, Statistical analysis of hair breakage. II. Repeated grooming experiments, J. Cosmet. Sci., 61(6), 439–455 (2010). (5) J. M. Marsh, S. Whitaker, T. Felts, W. Shearouse, M. Vatter, A. Määttä, M. Thompson, and T. J. Hawkins, Role of internal lipids in hair health, J. Cosmet. Sci., 69(5), 347–356 (2018). (6) V. Signori and D. M. Lewis, FTIR investigation of the damage produced on human hair by weathering and bleaching processes: implementation of different sampling techniques and data processing, Int. J. Cosmet. Sci., 19(1), 1–14 (1997). (7) G. Loussouarn, A. L. Garcel, I. Lozano, C. Collaudin, C. Porter, S. Panhard, D. Saint-Léger, and R. de La Mettrie, Worldwide diversity of hair curliness: a new method of assessment, Int. J. Dermatol., 46(Suppl. 1), 2–6 (2007). (8) K. Watanabe, K. Nagami, K. I. Suzuta, T. Maeda, and L. Ito, Cysteic acid formation behaviors in bleached hair of southeast Asian characterized by infrared spectroscopy, Adv. Life Sci., 5(4), 85–89 (2015). (9) K. Kizawa, T. Inoue, M. Yamaguchi, P. Kleinert, H. Troxler, C. W. Heizmann, and Y. Iwamoto, Dissimilar effect of perming and bleaching treatments on cuticles: advanced hair damage model based on elution and oxidation of S100A3 protein, J. Cosmet. Sci., 56(4), 219–226 (2005). (10) G. A. Camacho-Bragado, G. Balooch, F. Dixon-Parks, C. Porter, and H. Bryant, Understanding breakage in curly hair. Br. J. Dermatol. 173(Suppl. 2), 10–16 (2015). (11) C. R. Robbins, The cell membrane complex: three related but different cellular cohesion components of mammalian hair fibers, J. Cosmet. Sci., 60(4), 437–465 (2009).
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