Age, lifestyle and self-perceptions of hair : is there an association with hair diameter and tensile properties / Lane Duvel in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 41, N° 5 (10/2019)  

[article]  inINTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 41, N° 5 (10/2019) . - p. 509-515 Titre : Age, lifestyle and self-perceptions of hair : is there an association with hair diameter and tensile properties Type de document : texte imprimé Auteurs : Lane Duvel, Auteur ; A. Herbal, Auteur ; L. Daniels, Auteur ; R. Kong, Auteur ; Greg. G. Hillebrand, Auteur Année de publication : 2019 Article en page(s) : p. 509-515 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Âge Biophysique Epidémiologie Indice de masse corporelle Perception Tabagisme Index. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : To determine the association of age, lifestyle habits and the self‐perception of hair condition with the objectively measured physical properties of hair in Caucasian females with brown hair. - Methods : Hair biophysical properties, lifestyle habits data and self‐perceptions of hair condition were collected on 110 Caucasian females with brown hair ranging in age from 17 to 78. Hair diameter (cross‐sectional area) and tensile properties (elastic modulus, break strength and break extension) were measured at the root end of individual fibres (n = 100/subject) from the crown and frontal regions using objective instrumental methods. Other measures included body mass index (BMI) and Savin female pattern hair loss grades based on judging of standardized front, top and side view head images. Lifestyle habits and practices and self‐perceived hair condition were obtained via a standardized self‐assessment questionnaire. - Results : Hair fibre diameter and break extension decreased significantly with age. Hair fibre elastic modulus and Savin hair loss scores increased significantly with age. No age‐related change in hair fibre break stress was observed. A history of smoking or being overweight was significantly associated with having lower hair fibre cross‐sectional area but was not associated with any of the measured tensile properties. Subjects who perceived their hair as fine, thinning or weak had significantly lower cross‐sectional areas than subjects who did not. Subjects who perceived their hair to be healthy or strong had significantly higher cross‐sectional areas than subjects who did not. - Conclusion : The biophysical properties of hair change significantly with age. A history of smoking or being overweight was significantly associated with having smaller hair cross‐sectional area but was not associated with differences in hair tensile properties. The self‐perception of having strong or healthy hair seems more associated with having a larger cross‐sectional area than any real differences in hair strength. Note de contenu : - MATERIALS AND METHODS : Study design - Hair sample collection - Self-assessment questionnaire - Hair cross-sectional area and tensile properties - Hair density via savin female pattern hair loss grades - Body mass index - Statistics - RESULTS AND DISCUSSION : Hair cross-sectional area by age, scalp site and hormonal status - Hair tensile property changes DOI : 10.1111/ics.12569 En ligne : https://drive.google.com/file/d/1Rv8lJFUHuDPc9-B5OImxiCXWJpFwm8c6/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33231 [article]

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Effect of two shampoo formulations on the prokaryotic and eukaryotic microbiota composition of the human scalp in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 46, N° 1 (02/2024)  

[article]  inINTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 46, N° 1 (02/2024) . - p. 62-70 Titre : Effect of two shampoo formulations on the prokaryotic and eukaryotic microbiota composition of the human scalp Type de document : texte imprimé Année de publication : 2024 Article en page(s) : p. 62-70 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acides ribonucléique Âge Bactéries Cheveux -- Soins et hygiène Cuir chevelu Cuir chevelu -- Soins et hygiène Dermo-cosmétologie Levures (botanique) Microbiote cutané shampooings Index. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : The human scalp is characterized by a moderately diverse microbial community, comprising prokaryotic (bacteria) and eukaryotic (fungi) members. Although the details are far from being fully understood, the human scalp microbiota is implicated in several scalp disorders, in particular dandruff formation. Hence, the protection of an intact and diverse scalp microbiota can be regarded as a quality criterion for hair and scalp care formulations. In this study, we investigated the influence of two commercially available, non-antimicrobial shampoo formulations on the structure of the scalp microbiota. - Methods : Scalp microbiota samples, obtained by swab sampling from two cohorts of probands (n = 25, each), were analysed before and after daily use of two different shampoo formulations for 2 weeks, respectively. A polyphasic approach was used, comprising quantitative cultivation of bacteria and fungi on selective media as well as sequencing of PCR-amplified 16S rRNA and 18S rRNA genes, respectively. - Results : All analyses revealed a microbiota composition typical for the human scalp. While in particular fungal germ numbers increased significantly during the treatments, overall bacterial and fungal community composition was not affected, based on alpha- and beta-diversity measures. However, we observed an increase in structural bacterial diversity with the age of the probands. - Conclusions : Over an application period of 2 weeks, the investigated shampoo induced quantitative but no qualitative changes in the scalp microbial community structure of the investigated probands, suggesting no adverse but rather preserving or even stimulating effects of the underlying formulations on the scalp microbiota. Further investigation will have to clarify if this is also true for longer application periods and if the formulations might affect community functionality, for example microbial gene expression, rather than community composition. Note de contenu : - MATERIALS AND METHODS : Application study and scalp sampling - Microbiological cell counts - DNA extraction for molecular analyses - Library preparation and sequencing - Bioinformatical and statistical analyses - RESULTS AND DISCUSSION : Sequencing data and general microbial community composition - Factors influencing microbial community composition - Table 1 : INCI list of the used shampoo formulations DOI : https://doi.org/10.1111/ics.12895 En ligne : https://drive.google.com/file/d/15s-ZDMAWc8OzdyvN0HdKGUiGQoIuXn5t/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40579 [article]

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Effects of age on the structure ad bleaching/dyeing behaviour of hair / Haona Wang in COLORATION TECHNOLOGY, Vol. 137, N° 3 (06/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 3 (06/2021) . - p. 226-233 Titre : Effects of age on the structure ad bleaching/dyeing behaviour of hair Type de document : texte imprimé Auteurs : Haona Wang, Auteur ; Li Kong, Auteur ; Honghui Xia, Auteur ; Jie Min Huang, Auteur ; Bo Deng, Auteur ; Heng Pan, Auteur Année de publication : 2021 Article en page(s) : p. 226-233 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Âge Caractérisation Cheveux -- analyse Cheveux -- Propriétés mécaniques Cheveux -- Teinture Décoloration Etudes comparatives Index. décimale : 668.5 Parfums et cosmétiques Résumé : The structure and bleaching/dyeing behaviour of hair sampled from people of various ages were investigated to provide guidance for wig-making. Hair surface and cross-sectional morphology were investigated by scanning electron microscopy, whereas the number density and size of melanin granules were evaluated by transmission electron microscopy. The suitability of hair for dyeing was determined by the trade-off between the fracture strength and lightness of bleached samples. Hair collected from 26-year-olds showed the highest number density and the lowest size of melanin granules, thus featuring the lowest mechanical strength reduction and the highest lightness increase after bleaching. The optimal bleaching conditions for such hair were identified as bleaching time = 80 minutes, hydrogen peroxide (H2O2) concentration = 60 mL/L, and bleaching temperature = 75°C. Considering its resilience to damage and favourable dyeing behaviour, hair sampled from 26-year-olds was concluded to be most suitable for wig-making. Thus, the present research provides guidance for the selection of raw materials for wig-making. Note de contenu : - EXPERIMENTAL : Materials - Rinsing of human hairs - Pretreatment and bleaching of human hairs - Dyeing of human hairs - Hair characterisation - RESULTS AND DISCUSSION : Effects of age on hair surface and cross-sectional morphology - Effects of hair age on the number density and average area of melanin granules - Effects of bleaching on hair fracture strength, lightness, and regularity - Optimal bleaching conditions for 26-year-old hair - Comparison of control, bleached, and dyed 26-year-old hair DOI : https://doi.org/10.1111/cote.12525 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12525 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36089 [article]

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The influence of age, gender and race/ethnicity of the composition of the human axillary microbiome / M. Li in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 41, N° 4 (08/2019)  

[article]  inINTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 41, N° 4 (08/2019) . - p. 371-377 Titre : The influence of age, gender and race/ethnicity of the composition of the human axillary microbiome Type de document : texte imprimé Auteurs : M. Li, Auteur ; A. E. Budding, Auteur ; M. van der Lugt-Degen, Auteur ; L. Du-Thumm, Auteur ; M. Vandeven, Auteur ; Aixing Fan, Auteur Année de publication : 2019 Article en page(s) : p. 371-377 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Âge Aisselles Femmes Groupe ethnique Hommes Microbiome cutané Transpiration Index. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : The microbial community plays an important role in the generation of human axillary odour by transforming odourless natural secretions into volatile odorous molecules. A limited number of traditional culturing methods and molecular based research have been performed to characterize the human axillary microbiome in small collection sample sizes. Moreover, only a few have considered the interpersonal variations across age, gender or race/ethnicity, and none have included all three variables within one single study. The aim of this study was to characterize the axillary microbiome of healthy subjects across different age groups, genders and races/ethnicities in a large sample size. - Methods : The underarm skin swab samples were collected from 169 healthy subjects. The axillary microbiome was analysed by IS‐pro, a clinically validated high‐throughput DNA fingerprinting technique. - Results : The results indicate that the senior subjects (55+) tend to have a higher number of total bacterial than younger adults (of a defined age). The diversity of odour causing bacteria, e.g. corynebacteria, increases with age. Among the three races/ethnicities studied, East Asians have a unique microbial composition compared to Caucasians and Hispanics, which may contribute to the different odour profiles observed among the races/ethnicities studied. - Conclusion : Human axillary microbiome varies by age, gender and race/ethnicity. This study has provided an unprecedented fundamental knowledge about the axillary microbiota as a function of age, gender and race/ethnicity. Note de contenu : - MATERIALS AND METHODS : Subject recruitment - Sample collection - IS-profiling of axillary microbiota and data analysis - RESULTS : Overall diversity of human axillary microbiome - Age effect on human axillary microbiome - Gender effect on the human axillary microbiome - Race/ethnicity effect on the human axillary microbiome DOI : 10.1111/ics.12549 En ligne : https://drive.google.com/file/d/1HL6JX5m_QbjAPdK9oHUZ0x88HyxQ7USd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33116 [article]

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