title: Labile proteins accumulated in damaged hair upon permanent waving and bleaching treatments.
abstract: We previously found that certain hair proteins were soluble by means of a partial extraction method. In this study, we demonstrate that the amount of soluble proteins internally formed in permed and bleached hair, labile proteins, is a useful index for hair damage assessment. Compared to tensile property changes, this index rose in widely dynamic ranges as the time of either permanent waving or bleaching treatments increased. The amount of labile proteins was much larger than that of proteins eluted into perming and bleaching lotions. However, the labile proteins showed electrophoretic profiles similar to those of the eluted proteins. These results suggest that a portion of the stable proteins in normal hair was transformed into labile proteins upon permanent waving and bleaching treatments. Consequently, permed and bleached hair tends to release the resultant labile proteins.
authors.affiliation: Basic Research Laboratory, Kanebo Ltd, Kotobuki-cho 5-3-28 Odawara 250-0002, Japan.
authors.forename: Takafumi
authors.initials: T
authors.lastname: Inoue
authors.forename: Mayumi
authors.initials: M
authors.lastname: Ito
authors.forename: Kenji
authors.initials: K
authors.lastname: Kizawa
mesh_terms: D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D006197:Hair / Q000737:chemistry*; D006203:Hair Preparations; D006801:Humans; D008297:Male; D011506:Proteins / Q000737:chemistry* / Q000302:isolation & purification; D013718:Tensile Strength
chemical_list: D006203:Hair Preparations; D011506:Proteins