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Investigation of dyeing behavior of oxidative dye in fine structures of the human hair cuticle by nanoscale secondary ion mass spectrometry. 2015

T Kojima, and H Yamada, and Y Saito, and T Nawa, and M Isobe, and T Yamamoto, and D Aoki, and Y Matsushita, and K Fukushima
General Research & Development Institute, Hoyu Co., Ltd., Nagakute, Aichi, Japan.

OBJECTIVE In oxidative coloring, the hair cuticle layers are not only the penetration pathway for active ingredients but also one of the most important dyeing regions. The dyeing mechanism of oxidative dyes in fine structures of the cuticle remains unclear. To investigate the dyeing behavior of oxidative dyes in fine structures of the cuticle, hair cross-sections were analyzed by nanoscale secondary ion mass spectrometry (NanoSIMS). METHODS The preparation method of hair cross-section for NanoSIMS measurement was improved. Improved hair cross-sections were analyzed using NanoSIMS. RESULTS The cuticle layer thickness of the hair cross-section could be widened. It was confirmed that (12) C(-) ions were more strongly detected from endocuticle than from other fine structures of cuticle. The NanoSIMS (12) C(-) image and hue saturation intensity (HSI) D(-) /(1) H(-) ratio image of the hair, dyed with deuterium-labeled oxidative dye, indicated that the endocuticle had a higher D(-) /(1) H(-) ratio than the other fine structures of the cuticle. It was substantiated that more colored chromophores were fixated in the endocuticle than in other fine structures of the cuticle. CONCLUSIONS The dyeing behavior of oxidative dyes in fine structures of hair cuticle was substantiated by NanoSIMS analysis using the improved hair cross-section preparation method.

UI MeSH Term Description Entries
D007564 Japan A country in eastern Asia, island chain between the North Pacific Ocean and the Sea of Japan, east of the Korean Peninsula. The capital is Tokyo. Bonin Islands
D010655 Phenylenediamines Aniline compounds that contain two amino groups. They are used as a precursor in the synthesis of HETEROCYCLIC COMPOUNDS and POLYMERS. p-Phenylenediamine is used in the manufacture of HAIR DYES and is an ALLERGEN.
D006197 Hair A filament-like structure consisting of a shaft which projects to the surface of the SKIN from a root which is softer than the shaft and lodges in the cavity of a HAIR FOLLICLE. It is found on most surfaces of the body. Fetal Hair,Hair, Fetal,Lanugo,Fetal Hairs,Hairs,Hairs, Fetal
D006202 Hair Dyes Dyes used as cosmetics to change hair color either permanently or temporarily. Coloring Agents, Hair,Dyes, Hair,Hair Colorants,Hair Dye,Agents, Hair Coloring,Colorants, Hair,Dye, Hair,Hair Coloring Agents
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D014018 Tissue Distribution Accumulation of a drug or chemical substance in various organs (including those not relevant to its pharmacologic or therapeutic action). This distribution depends on the blood flow or perfusion rate of the organ, the ability of the drug to penetrate organ membranes, tissue specificity, protein binding. The distribution is usually expressed as tissue to plasma ratios. Distribution, Tissue,Distributions, Tissue,Tissue Distributions
D016877 Oxidants Electron-accepting molecules in chemical reactions in which electrons are transferred from one molecule to another (OXIDATION-REDUCTION). Oxidant,Oxidizing Agent,Oxidizing Agents,Agent, Oxidizing,Agents, Oxidizing
D021241 Spectrometry, Mass, Electrospray Ionization A mass spectrometry technique used for analysis of nonvolatile compounds such as proteins and macromolecules. The technique involves preparing electrically charged droplets from analyte molecules dissolved in solvent. The electrically charged droplets enter a vacuum chamber where the solvent is evaporated. Evaporation of solvent reduces the droplet size, thereby increasing the coulombic repulsion within the droplet. As the charged droplets get smaller, the excess charge within them causes them to disintegrate and release analyte molecules. The volatilized analyte molecules are then analyzed by mass spectrometry. ESI Mass Spectrometry,Electrospray Ionization Mass Spectrometry,Mass Spectrometry, ESI,Spectrometry, ESI Mass
D036103 Nanotechnology The development and use of techniques to study physical phenomena and construct structures in the nanoscale size range or smaller. Nanotechnologies
D065966 Absorption, Physicochemical The physical process of passing into, or being taken up or taken in by a substance. Physicochemical Absorption

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