Compositional changes of human hair melanin resulting from bleach treatment investigated by nanoscale secondary ion mass spectrometry

Background/purpose It is important to understand the influence of bleach treatment on human hair because it is one of the most important chemical treatments in hair cosmetic processes. A comparison of the elemental composition of melanin between virgin hair and bleached hair would provide important...

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Published in:Skin research and technology 2014-11, Vol.20 (4), p.416-421
Main Authors: Kojima, Toru, Yamada, Hiromi, Isobe, Mitsuru, Yamamoto, Toshihiko, Takeuchi, Miyuki, Aoki, Dan, Matsushita, Yasuyuki, Fukushima, Kazuhiko
Format: Article
Language:English
Subjects:
bleach
elemental mapping
Hair - chemistry
Hair Bleaching Agents - chemistry
Hairstyles
human hair
Humans
Ions
Mass spectrometry
melanin
Melanins - chemistry
NanoSIMS
Oxidation-Reduction
Oxygen - analysis
Oxygen - chemistry
Spectrometry, Mass, Electrospray Ionization - methods
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Summary:Background/purpose It is important to understand the influence of bleach treatment on human hair because it is one of the most important chemical treatments in hair cosmetic processes. A comparison of the elemental composition of melanin between virgin hair and bleached hair would provide important information about the structural changes of melanin. To investigate the elemental composition of melanin granules in virgin black hair and bleached hair, these hair cross‐sections are analyzed by using a nanoscale secondary ion mass spectrometry (NanoSIMS). Methods The virgin black hair and bleached hair samples were embedded in resin and smooth hair cross‐sections were obtained using an ultramicrotome. NanoSIMS measurements were performed using a Cs+ primary ion beam to detect negative secondary ions. Results More intensive 16O− ions were detected from the melanin granules of bleached hair than from those of virgin black hair in NanoSIMS 16O− ion image. In addition, it was indicated that 16O− ion intensity and 16O‐/12C14N− ion intensity ratio of melanin granules in bleached hair were higher than those in virgin black hair. Conclusion Nanoscale secondary ion mass spectrometry analysis of the cross‐sections of virgin black hair and bleached hair indicated that the oxygen content in melanin granules was increased by bleach treatment.
ISSN:0909-752X
1600-0846
DOI:10.1111/srt.12133