Analysis of water distribution in delipidated human hair by small-angle neutron scattering (SANS) / Aya Ishihara in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 43, N° 6 (12/2021)  

[article]  inINTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 43, N° 6 (12/2021) . - p. 653-661 Titre : Analysis of water distribution in delipidated human hair by small-angle neutron scattering (SANS) Type de document : document électronique Auteurs : Aya Ishihara, Auteur ; Yoshiaki Tsukamoto, Auteur ; Hiroyuki Inoue, Auteur ; Yohei Noda, Auteur ; Satoshi Koizumi, Auteur ; Kyohei Joko, Auteur Année de publication : 2021 Article en page(s) : p. 653-661 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse quantitative (chimie) Cheveux -- analyse Cholestérol Diffusion de neutrons aux petits angles La diffusion de neutrons aux petits angles (DNPA) permet de sonder la matière aux échelles spatiales allant de 0.5 et 50 nm en déterminant les grandeurs moyennes qui caractérisent la taille et la forme des objets ainsi que leurs interactions. (https://www.neutron-sciences.org) Eau Formique, Acide Lipides Index. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : It is known that damaged hair has a part of its internal structure damaged, and its water absorption and desorption behavior are different. In recent years, it has been reported that internal lipids play an important role in the adsorption and desorption of water to the hair. Therefore, we investigate whether the water distribution in hair and the amount of internal lipids are related. - Methods : To investigate the effect of internal lipid on water distribution, we prepare human hair samples with and without a partial lack of internal lipids. Internal lipids have been removed using formic acid. The distribution of D2O in the hair is investigated using small angle neutron scattering (SANS) under the wet and dry conditions of each hair sample. - Results : It is found from the obtained SANS data that formic acid-treated hairs tended to have fewer 40Ã…-sized water clusters that were periodically present along the fibre axis in the wet condition. On the other hand, in the dry condition, there were no differences in water distribution between samples. - Conclusion : These observations are believed to have been caused by the reduction of 40Ã…-sized water clusters existing on the constituents removed by formic acid treatment, especially the hydrophobic (lipid) constituent tissues. Consequently, it is clarified that internal lipids are deeply involved in the state of water distribution on hair in wet conditions. Note de contenu : MATERIALS AND METHODS : Hair samples - Quantification of lipid and cholesterol - Small angle neutron scattering measurement - SANS data analysis - RESULTS : Changes in hair constituents by formic acid treatment - SANS profile and analytical results under D2O immersion(Wet) and Dry conditions - Consideration - Table 1 : The amounts of solvent- extractable lipids and cholesterol - Table 2 : The obtained various characteristics of peaks DOI : https://doi.org/10.1111/ics.12741 En ligne : https://drive.google.com/file/d/12E1natzEkPm07KGcyUfai3nj6T53Et-h/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37047 [article]

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