Theory and Its Practical Application for Permanent Hair Straightening.

Ogawa, Shuntaro; Fujii, Kazuki; Kaneyama, Katsumi; Arai, Kozo; Joko, Kyohei

doi:10.5107/sccj.34.63

Cited by 4 publications

(15 citation statements)

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“…Hair samples used were from Japanese women (12 and 14 years-old) who had not been exposed to chemical treatment. Purification of hair was performed as reported previously [1,2]. Two kinds of hair samples, which were different between the contents of cystine were used.…”

Section: Methodsmentioning

confidence: 99%

“…With respect to this, it has been reported that (1) for reduction treatment, the application of a bicomponent system composed of TGA and DTDG has an advantage to prevent hair damage [1][2][3], that (2) there is no difference in the chemical characteristics between the TGA-only and the bicomponent systems [1][2][3], and that (3) there is little difference in the magnitude of the rate constants between both reducing systems [4]. These are the results obtained from a qualitative treatment for the reactions of hair.…”

Section: Introductionmentioning

confidence: 99%

“…Straightened hairs were prepared by three step processes, i.e., (1) reduction followed by washing, (2) heat treatment, and (3) oxidation. Detailed treatments for each step were as described below.…”

Section: Preparation Of Straightened Hairsmentioning

confidence: 99%

“…This method includes a heating process after the reduction with thioglycolic acid (TGA) of hair where keratin disulfide bridges are cleaved. It has been reported that the degree of supercontraction by the heating is closely related to the maintenance of the straight hair configuration, and further that the permanency is a result of the irreversible transformation of α-crystal into the amorphous phase followed by the reformation of disulfide cross-links at the final oxidation step [3].…”

Section: Introductionmentioning

confidence: 99%

“…A combined process consisting of chemical treatments and heat treatment by means of hot iron press has been commercially applied for permanent hair straightening [1][2][3]. This method includes a heating process after the reduction with thioglycolic acid (TGA) of hair where keratin disulfide bridges are cleaved.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Chemical Reactions Occurring in Curing Treatment for Permanent Hair Straightening Using Thioglycolic and Dithioglycolic Acids

Ogawa¹,

Takeda²,

Kaneyama³

et al. 2009

Sen-i Gakkaishi

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Preparation Of Straightened Hairsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Chemical Reactions Occurring in Curing Treatment for Permanent Hair Straightening Using Thioglycolic and Dithioglycolic Acids

Ogawa¹,

Takeda²,

Kaneyama³

et al. 2009

Sen-i Gakkaishi

Self Cite

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Analysis of structural change in keratin fibers resulting from chemical treatments using Raman spectroscopy

Kuzuhara¹

2005

Biopolymers

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In order to investigate the influence of chemical treatments (reduction, heating, and oxidation) on keratin fibers, the structure of virgin white human hair resulting from a permanent hair straightening process at various depths of cross-sectional samples was directly analyzed without isolating the cuticle and cortex, using Raman spectroscopy. The band shape of the cuticle was different from that of the cortex, and the cuticle had a more amorphous structure, compared with the cortex. The S-S band intensity existing in the hair surface remarkably decreased, while the S-S band intensity in the hair center was not changed by performing the reduction process. In the case of heating the keratin fibers after the reduction process, this tendency was unchanged. On the other hand, the amide III (unordered) band intensity in the cortex region increased, indicating that proteins existing throughout the cortex region caused a change to the random coil form. Moreover, approximately 95% of the disconnected -SS- groups were clearly reconnected by performing the oxidation process after heating (the degree of reconnection of -SS- groups was about 90%, in the case of oxidizing after reduction). From these experiments, we concluded that the heat treatment process in the permanent hair straightening treatment caused the randomization of proteins existing throughout the cortex region, thereby contributing to the acceleration of the reconnection of -SS- groups during the oxidation process.

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Protein Secondary Structure Imaging with Ultrabroadband Multiplex Coherent Anti-Stokes Raman Scattering (CARS) Microspectroscopy

et al. 2012

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Protein secondary structures in human hair have been studied with ultrabroadband multiplex coherent anti-Stokes Raman scattering (CARS) microspectroscopy. The CARS peak-shift mapping method has been developed and applied to hair samples with and without treatments by chemical reduction and mechanical extension. It clearly visualizes the treatment induced changes in protein secondary structures and their spatial distributions. Using the new imaging technique, we found a multilayered structure in the human hair cortex.

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Theory and Its Practical Application for Permanent Hair Straightening.

Cited by 4 publications

References 0 publications

Chemical Reactions Occurring in Curing Treatment for Permanent Hair Straightening Using Thioglycolic and Dithioglycolic Acids

Chemical Reactions Occurring in Curing Treatment for Permanent Hair Straightening Using Thioglycolic and Dithioglycolic Acids

Analysis of structural change in keratin fibers resulting from chemical treatments using Raman spectroscopy

Protein Secondary Structure Imaging with Ultrabroadband Multiplex Coherent Anti-Stokes Raman Scattering (CARS) Microspectroscopy

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