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Age-dependent changes in eumelanin composition in hairs of various ethnic origins / S. Commo in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 34, N° 1 (02/2012)
[article]
Titre : Age-dependent changes in eumelanin composition in hairs of various ethnic origins Type de document : texte imprimé Auteurs : S. Commo, Auteur ; K. Wakamatsu, Auteur ; Isabelle Lozano, Auteur ; S. Panhard, Auteur ; G. Loussouarn, Auteur ; B. A. Bernard, Auteur ; S. Ito, Auteur Année de publication : 2012 Article en page(s) : p. 102-107 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cheveux
Dopachrome Tautomerase
Eumélanine
MélanineTags : Âge 'Dopachrome tautomerase' 'Origine ethnique' Eumélanine 'Mélanine cheveu' Index. décimale : 668.5 Parfums et cosmétiques Résumé : Hair pigmentation is one of the most conspicuous phenotypes of humans. From a chemical point of view, however, data remain scarce regarding human hair pigmentation characteristics. To determine melanin content and composition in human eumelanic hair from individuals of different ethnic origins and at different ages, we collected hair from 56 subjects with eumelanic hair from each group of African-American, East Asian, and Caucasian origin. The 56 subjects consist of 14, seven each of males and females, each from four age classes of younger than 11, between 12 and 19, between 20 and 45, and older than 46. We analysed hair colour scale, total melanin value, and contents of pyrrole-2,3,5-tricarboxylic acid (PTCA) and pyrrole-2,3-dicarboxylic acid (PDCA). We measured age-dependent increases in the relative quantity of eumelanin in pigmented human hairs in the three ethnic groups. Regarding melanin composition, we observed an increase in the PDCA/PTCA ratio with age in African-American and Caucasian hairs until approaching the quite constant level of the ratio in East Asian hairs in the elderly individuals. Our results evidence differences in the content and composition of eumelanin in human hair among African-American, Caucasian and East Asian individuals. Furthermore, we show evidence of age-dependent changes in the quantity and quality of eumelanin in pigmented human hairs. In particular, the age-dependent modification of the PDCA/PTCA ratio, a marker for 5,6-dihydroxyindole units in eumelanin, suggests a chronological evolution of hair follicle melanocyte phenotype (e.g. decrease in dopachrome tautomerase expression). Note de contenu : - MATERIALS AND METHODS : Hair samples - Chemical analyses - Statistical analyses
- RESULTS : Pigmentation scores in the three ethnic groups - Effect of age on quantity and quality of eumaleninDOI : 10.1111/j.1468-2494.2011.00691.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1468-2494.2011.00691.x Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13285
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 34, N° 1 (02/2012) . - p. 102-107[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13560 - Périodique Bibliothèque principale Documentaires Disponible The diversity of the human hair colour assessed by visual scales and instrumental measurements. A worldwide survey / Isabelle Lozano in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 39, N° 1 (02/2017)
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Titre : The diversity of the human hair colour assessed by visual scales and instrumental measurements. A worldwide survey Type de document : texte imprimé Auteurs : Isabelle Lozano, Auteur ; J. B. Saunier, Auteur ; S. Panhard, Auteur ; G. Loussouarn, Auteur Année de publication : 2017 Article en page(s) : p. 101-107 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale
Cheveux -- analyse
Colorimétrie
Pigmentation des cheveuxIndex. décimale : 668.5 Parfums et cosmétiques Résumé : Objectives : To study (i) the diversity of the natural colour of the human hair through both visual assessment of hair tone levels and colorimetric measurements of hair strands collected from 2057 human male and female volunteers, from 23 regions of the world and (ii) the correlation between visual assessments and colorimetric measurements.
Methods : Hair strands were analysed by a spectrocolorimeter under the L*, a*, b* referential system and scored in vivo by experts before sampling, through standardized visual reference scales based on a 1–10 range.
Results : Results show that from a typological aspect, black or dark brown hairs largely predominate among studied ethnic groups, whereas Caucasian or derived populations exhibit the widest palette of medium to fair shades, partly explaining some past interbreeding among populations. Instrumental measurements clearly confirm that a given colour of a pigmented hair, at the exclusion of red hairs, is mostly governed by two components, L* and b*, from the L*, a*, b* reference system.
Conclusion : The comparisons between visual assessments and instrumental data show that these appear closely linked. Darker hairs show close or subtle variations in L*, a*, b* parameters, making their individual colour differentiation calling for technical improvements in colorimetric measurements. The latter are likely governed by other physical factors such as shape, diameter and shine.Note de contenu : - MATERIALS AND METHODS : Subjects - Hair sampling - Visual assessments - Colorimetric measurements - Statistics
- RESULTS : Overall analysis through L*, a*, b* axis - Pigmented hairs (non-red, non-white) - Links between instrumental measurements and visual assessments - Pigmented hairs and geographical regions - The case of red hairs - The case of grey hairsDOI : 10.1111/ics.12359 En ligne : https://drive.google.com/file/d/14reAZ0LwAy-UVulJwPj_a2YASTVOECxx/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27849
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 39, N° 1 (02/2017) . - p. 101-107[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18648 - Périodique Bibliothèque principale Documentaires Disponible The worldwide diversity of scalp seborrhoea, as daily experienced by seven human ethnic groups / F. Pouradier in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 39, N° 6 (12/2017)
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Titre : The worldwide diversity of scalp seborrhoea, as daily experienced by seven human ethnic groups Type de document : texte imprimé Auteurs : F. Pouradier, Auteur ; C. Liu, Auteur ; J. Wares, Auteur ; E. Yokoyama, Auteur ; C. Collaudin, Auteur ; S. Panhard, Auteur ; Didier Saint-Léger, Auteur ; G. Loussouarn, Auteur Année de publication : 2017 Article en page(s) : p. 629-636 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir chevelu
Groupe ethnique
Mesure
Peau -- Physiologie
SébumIndex. décimale : 668.5 Parfums et cosmétiques Résumé : OBJECTIVE :
The re-greasing process and kinetics of the human scalp, post-shampooing, have been previously documented, in vivo, on a few Caucasian subjects. The objective of the presented research was to extend such knowledge over seven different ethnic groups.
METHODS :
The post-shampooing re-greasing kinetics of the scalp was studied on 1325 subjects (women and men of two distinct age classes) from seven different ethnic groups in their residential and native country. Sebum amounts were determined onto small shaved scalp areas at various times post-shampooing, using the Sebumeter® technique.
RESULTS :
As previously published on Caucasian subjects, scalp re-greasing process follows a hyperbolic-like kinetics over days. However, amounts of collected sebum highly vary with ethnicity. As recorded through the casual level (CL) at the equilibrium phase, 2–3 days post-shampooing, the highest amount of sebum was found in African American subjects, followed in descending order by Caucasian American, Japanese, Chinese, Thai, Caucasian European and Indian subjects, the latter showing very low values. Lower amounts of sebum were recorded in the older age class in all ethnics, as compared to the younger one, and male subjects were found higher sebum producers than women, irrespective of ethnicity.
CONCLUSION :
The kinetics and slopes of the re-greasing process of the human scalp appear similar in all ethnic groups studied. However, striking quantitative differences are found between the seven ethnic groups, resulting from different sebaceous production levels and scalp hygiene routines.Note de contenu : - MATERIALS AND METHODS : Locations and timing of the studies - Subjects - Protocol - Statistics
- RESULTS : Sebum production over time in the seven groups
- DISCUSSIONDOI : 10.1111/ics.12425 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29478
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Code-barres Cote Support Localisation Section Disponibilité 19393 - Périodique Bibliothèque principale Documentaires Disponible What is a caucasian 'fine' hair ? Comparing instrumental measurements, self-perceptions and assessments from hair experts / S. Bouabbache in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 38, N° 6 (12/2016)
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Titre : What is a caucasian 'fine' hair ? Comparing instrumental measurements, self-perceptions and assessments from hair experts Type de document : texte imprimé Auteurs : S. Bouabbache, Auteur ; Anthony Galliano, Auteur ; P. Littaye, Auteur ; M. Leportier, Auteur ; E. Gillot, Auteur ; S. Panhard, Auteur ; G. Loussouarn, Auteur Année de publication : 2016 Article en page(s) : p. 581-588 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biologie
Cheveux -- analyse
Cheveux -- Croissance
Cheveux -- Epaisseur
Epaisseur -- Mesure
Evaluation
StatistiquesIndex. décimale : 668.5 Parfums et cosmétiques Résumé : Objectif : De déterminer les différents facteurs qui gouvernent les termes 'cheveux fins' souvent employé par les femmes Caucasiennes.
Méthodes : Trois approches complémentaires furent utilisées (auto évaluations, jugements sensoriels d'experts et des mesures instrumentales afin de préciser les paramètres convergents à ces 3 approches. 151 Femmes Caucasiennes d'âges différents et déclarant avoir (ou non) des cheveux fins ont participé à l'étude. Les mesures instrumentales comprenaient la détermination du diamètre du cheveu, la densité de cheveux, la résistance du cheveu à la traction, sa flexibilité et les taux de sébum présents sur le scalp.
Résultats : Parmi 6 paramètres étudiés, 4 sont communs aux trois approches : la densité des cheveux (abondance), le diamètre du cheveu et sa résistance à la traction et le volume global de la chevelure. En revanche, le terme courant "corps" (d'une définition complexe) n'apparaît commun qu'aux évaluations d'experts et à l'auto-évaluation des sujets. L'influence de la frisure n'est commune qu'aux mesures instrumentales et les évaluations des experts.
Conclusions : L'étude indique non seulement de nombreux accords entre les évaluations sensorielles et les mesures instrumentales, mais souligne aussi la capacité des sujets à décrire leurs cheveux de manière subtile et précise. Les termes "cheveux fins" englobent donc d'autres significations que leur seule épaisseur. Le vieillissement impacte clairement certains facteurs associés aux cheveux dits "fins" parmi les sujets étudiés.Note de contenu : - MATERIALS AND METHODS : Subjects - Protocol - Instrumental methods - Statistics
- RESULTS : Hair thickness/diameter - Hair density, hair abundance - Scalp greasiness - Volume of hair - Physical properties of hair - Curl types - Overall analysisDOI : 10.1111/ics.12323 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/ics.12323 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27535
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