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09:46
Synthesis of Plant Phenol-derived Polymeric Dyes for Direct or Mordant-based Hair Dyeing
Published on: December 1, 2016
Copper and calcium uptake in colored hair
K E Smart1, M Kilburn, M Schroeder
1Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK.
Journal of Cosmetic Science
|July 10, 2009
Summary
Hair coloring oxidizes disulfide bonds, creating sites for metal ion uptake like calcium and copper. NanoSIMS imaging reveals these metals concentrate in the cuticle
Area of Science:
- Hair science
- Materials science
- Analytical chemistry
Background:
- Hair coloring processes can damage hair fibers by oxidizing disulfide bonds.
- Oxidized hair attracts metal ions like calcium (Ca2+) and copper (Cu2+) from tap water.
- Metal ion accumulation negatively impacts hair properties and can cause further damage during subsequent treatments.
Purpose of the Study:
- To investigate the precise location of calcium and copper ions within hair fibers after coloring and washing.
- To understand metal ion distribution to inform strategies for metal removal or chemistry control.
- To assess the impact of tap water metal ions on colored hair integrity.
Main Methods:
- Nanoscale secondary ion mass spectrometry (NanoSIMS) was employed for high-resolution elemental mapping.
- Colored hair samples washed in tap water were analyzed.
- Untreated hair served as a control to establish baseline elemental distribution.
Main Results:
- NanoSIMS provided images with up to 50-nm spatial resolution.
- Calcium ions were found to preferentially accumulate in the cuticle region of colored hair.
- High concentrations of calcium were specifically observed in sulfur-rich areas, including the A-layer and exocuticle.
Conclusions:
- The study successfully mapped the nanoscale distribution of calcium in colored hair.
- Calcium accumulation is localized in specific sulfur-rich regions of the hair cuticle.
- Understanding this localization is crucial for developing targeted treatments to mitigate metal-induced hair damage.
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