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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The characterization of Pluronic P123 micelles in the presence of sunscreen agents in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 45, N° 4 (08/2023)  

[article]  inINTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 45, N° 4 (08/2023) . - p. 470-479 Titre : The characterization of Pluronic P123 micelles in the presence of sunscreen agents Type de document : texte imprimé Année de publication : 2023 Article en page(s) : p. 470-479 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cosmétiques 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) Emulsions -- Emploi en cosmétologie Emulsions -- Stabilité Formulation (Génie chimique) Peau -- Soins et hygiène Pénétration cutanée Produits antisolaires Surfactants Systèmes de livraison (pharmacie) Vectorisation Index. décimale : 668.5 Parfums et cosmétiques Résumé : - Objectives : The triblock copolymer Pluronic® is widely used in the personal care industry, including sun protection, for its film-forming and solubilization capabilities. In this study, the effect of three commonly used organic UV filters (ethylhexyl methoxycinnamate [EMC], ethylhexyl triazone [EHT], and avobenzone [AVB]) on the structure of Pluronic P123 micelles was investigated. - Methods : The Pluronic P123 micelle structure has been investigated using dynamic surface tension, nuclear magnetic resonance (NMR) and small-angle neutron scattering (SANS). - Results : Dynamic surface tension results show strong interactions between the UV filters and Pluronic® evident by sharp changes in the surface activity of the latter. The NMR results have revealed the creation of a hydrophobic microenvironment special to the Pluronic PPO core group in the presence of UV filters. Some interaction with the hydrophilic EO was also recorded, albeit weaker. This is further confirmed by SANS, where the Pluronic P123 micelles interacted with varying strengths with the UV filters, resulting in sharp changes in their size and shape. - Conclusions : We have demonstrated the sensitivity of the Pluronic P123 micelles to the presence of various UVA/B filters. The micelles shape varied from spherical to cylindrical as the concentration and type of the UV filters were varied. These variations in the shape are expected to have a significant effect on the sun protection factor (SPF), as it affects the solubilization of the UV filters within a formulation in addition to the formulations' rheological profile and film-forming behaviour. Note de contenu : - MATERIALS - METHODS : Preparation of Pluronic- UV filters solutions - Tensiometry - Nuclear magnetic resonance (NMR) - Small-angle neutron scattering (SANS) - RESULTS AND DISCUSSION : Dynamic surface tension (DST) - Nuclear magnetic resonance (NMR) - Small-angle neutron scattering (SANS) - Table 1 : SANS fitting parameters from P123 micelles (5 wt%) and EMC at different concentrations, in 10 wt% d6-ethanol and D2O, at 25°C - Table 2 : SANS fitting parameters from P123 micelles (5 wt%) and EHT at different concentrations, in 10 wt% d6-ethanol and D2O, at 25°C DOI : https://doi.org/10.1111/ics.12856 En ligne : https://drive.google.com/file/d/1wdAZR7CDALEhDuF0wkFrCPffAYeR-o2E/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39877 [article]

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