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Temporal and spatial visualization of water uptake into human hair studied by infrared microscopy

Abstract

Real-time examination of water behavior in cuticle, cortex, and medulla of untreated and bleached hair was performed by Fourier-transform infrared (FT-IR) microscopy. Penetration of heavy water from the cuticle to the medulla was visualized and quantified by monitoring the O–D stretching band located at 2500 cm−1. The medulla of untreated hair had a significantly higher peak O–D intensity from 20 min after the heavy water penetration to 20 min after drying than that of bleached hair. Furthermore, heavy water evaporated 1 h slower in untreated hair than in bleached hair in any part. These differences may be due to the increase of S=O stretching of sulfonic acid caused to breaking of the disulfide and thioester bonds by bleach treatment. The method proposed in this study revealed potential application in visualizing and quantifying real-time water behavior in hair.

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Acknowledgements

The authors acknowledge Mr. Masakatsu Ota for encouragement and invaluable advice during the whole study. The authors are very grateful to Professor Shigeaki Morita, Department of Engineering Science, Osaka Electro-Communication University, for their helpful advice and valuable suggestions.

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Correspondence to Naoya Fuse.

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Fuse, N., Matsui, M. & Matsue, Y. Temporal and spatial visualization of water uptake into human hair studied by infrared microscopy. ANAL. SCI. 38, 601–605 (2022). https://doi.org/10.1007/s44211-022-00074-x

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  • DOI: https://doi.org/10.1007/s44211-022-00074-x

Keywords

  • Infrared microscopy
  • Heavy water
  • Visualization
  • Hair
  • Bleached
  • Sulfonic acid