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Effect of photodamage on the outermost cuticle layer of human hair

Paper ID Volume ID Publish Year Pages File Format Full-Text
30133 44460 2015 9 PDF Available
Title
Effect of photodamage on the outermost cuticle layer of human hair
Abstract

•The morphology of hair outermost cuticle is significantly modified after irradiation with a mercury lamp.•The irradiation process resulted in the formation of small bumps (up to 5 nm height) on all cuticle surfaces.•Another photodegradation effect is the enlargement of pre-existing holes (holes increased around 338 % in depth).•As a result of irradiation, the height of the steps formed between the edges of two cuticle scales also increased ≈ 66 %.•The morphological changes were followed by an increase in the cystine oxidation level on the hair surface.

The surface of the hair is the region most exposed to solar radiation and to the environment in general. Many of the well-known damaging effects of sun exposure on hair must start or even be restricted to the most external cuticle layers. As such, this work investigates morphological, ultrastructural and chemical changes in the outermost cuticle layer of dark brown hair, using atomic force microscopy (AFM), field emission scanning electron microscopy (FESEM) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR). The results showed that after 230 h of irradiation with a mercury lamp, small bumps with globular shape (heights lying in the 1–5 nm range) appeared on the cuticle surface and their size increased with increasing irradiation times. In addition, the enlargement of pre-existing holes was also observed (holes increase around 350% in depth) and the height of the steps formed between the edges of two cuticle scales increased around 65%, as a result of 500 h of irradiation. The damages in hair strands were accurately identified by analyzing exactly the same surface region before and after irradiation by AFM images. Finally, the results were discussed in terms of the chemical differences between the non-irradiated and the irradiated hair, for instance, the increased level of cystine oxidation as a consequence of photodegradation.

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Keywords
Human hair; Cuticle; Morphology; Photodamage
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Effect of photodamage on the outermost cuticle layer of human hair
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 153, December 2015, Pages 296–304
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us