Abstract
The damage to human hair caused by permanent waving treatment was examined from the viewpoint of structure with several spectroscopic methods, 13C CP/MAS n.m.r., wide angle X-ray diffraction (WAXD), FTi.r. and Raman methods. The partial disruption of α-helical structure constituting the microfibril in hair fibre was revealed by this study, although the incomplete re-oxidation of the disulphide bond has been considered to be the main damage caused by the treatment. Moreover, this disruption was mainly caused in the first reduction process. In particular, 13C CP/MAS n.m.r. gave the quantitative evaluation for change of α-helical content in the microfibril with permanent waving treatment. In addition, FTi.r. and Raman spectra indicated that the α-helix was partially changed to random coil, rather than to β-sheet structure.
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