| Titre : |
Protect and repair hair from radiation and heat damage |
| Type de document : |
texte imprimé |
| Auteurs : |
Alain Thibodeau, Auteur ; Valeria Quaranta, Auteur |
| Année de publication : |
2018 |
| Article en page(s) : |
p. 51-55 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Cheveux -- Anatomie
Cheveux -- Soins et hygiène
|
| Index. décimale : |
668.5 Parfums et cosmétiques |
| Résumé : |
The human hair fibre is comprised of the external cuticle covering the cortex and the medulla that is confined to the centre of the fibre. To some extent, the hair has a structure that resembles that of the epidermis. The outermost cuticle layer is composed of differentiated keratinocytes filled with a type of cross-linked keratin. Cystine, a dimer of the amino acid cysteine, is the main building block of the cuticle keratin that provides a first line of protection against stresses. Five to ten layers of cuticles cells are overlapped and held together by a lipid matrix known as the Cell Membrane Complex (CMC). The CMC is composed of fatty acids, cholesterol and ceramides. This lipid content is analogous to that of the stratum corneum barrier. The CMC composition however differentiates from that of the skin by the presence of 18-methyleicosanoic acid (18-MEA). 18-MEA, a C21 branched fatty acid, may represent up to 40% of the fatty acid mixture found in the CMC. Moreover, 18-MEA also forms the F-layer that covers the outermost layer of the hair shaft also referred to as the epicuticle.The F-layer and its unique fatty acid composition imparts a hydrophobic property to the hair and helps protecting from external damage. It also contributes to hair shine. Cuticle multilayers surround the cortex that encloses melanin pigments giving the hair its colour. The cortex is made of elongated cortical cells aligned along the longitudinal axis of the hair shaft. The cortex also supports the mechanical properties and the tensile strenght of the hair. |
| Note de contenu : |
- Hair weathering and external damage |
| En ligne : |
https://drive.google.com/file/d/1vZeR1BKK3Ee4I3BhcC1g4Wkq9NDHiqkK/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31134 |
in PERSONAL CARE EUROPE > Vol. 12, N° 4 (09/2018) . - p. 51-55
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