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Ex vivo-In vivo correlation of retinol stratum corneum penetration studies by confocal Raman microspectroscopy and tape stripping / Richard Krombholz in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 44, N° 3 (06/2022)
[article]
Titre : Ex vivo-In vivo correlation of retinol stratum corneum penetration studies by confocal Raman microspectroscopy and tape stripping Type de document : document électronique Auteurs : Richard Krombholz, Auteur ; Stefanie Fressle, Auteur ; Dominique Lunter, Auteur Année de publication : 2022 Article en page(s) : p. 299-308 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale
Barrière cutanée
Dermo-cosmétologie
Emulsions -- Emploi en cosmétologie
Microscopie confocale Raman
Pénétration cutanée
Vitamine AIndex. décimale : 668.5 Parfums et cosmétiques Résumé : Skin penetration studies of topically applied drugs are a challenging topic in the development of semisolid formulations. The most commonly used methods can be differentiated by their character into ex vivo/in vivo, invasive/non-invasive and offline/in-line measurements. In this study, we compare ex vivo tape stripping, an invasive technique, which is often used, to confocal Raman microspectroscopy (CRM), ex and in vivo, to establish a correlation between those methods. Retinol was used as a model drug, applied in an oil-in-water emulsion, to compare the skin penetration profiles obtained by the different methods. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of the retinol emulsion - Preparation of porcine ear skin - Incubation of porcine ear skin - Tape stripping - Retinol quantification by HPLC - Confocal Raman microspectroscopy (CRM) ex vivo/in situ - Retinol quantification by CRM - Confocal Raman microspectroscopy (CRM) in vivo - Data evaluation and statistics
- RESULTS : Ex vivo tape stripping - Ex vivo/in situ CRM - In vivo CRMDOI : https://doi.org/10.1111/ics.12775 En ligne : https://drive.google.com/file/d/1sA91sNCGXy5ZghRFSLH-LkB_5XpKDBVd/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38132
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 44, N° 3 (06/2022) . - p. 299-308[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Oxidative drying of alkyd paints catalysed by a dinuclear manganese complex (MnMeTACN) / Z. O. Oyman in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 88, B4 (12/2005)
[article]
Titre : Oxidative drying of alkyd paints catalysed by a dinuclear manganese complex (MnMeTACN) Type de document : texte imprimé Auteurs : Z. O. Oyman, Auteur ; J. H. Bieleman, Auteur ; A. Schut, Auteur ; J. Ter Borg, Auteur ; R. van der Linde, Auteur ; W. Ming, Auteur Année de publication : 2005 Article en page(s) : p. 269-275 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Catalyseurs métalliques
Complexes métalliques
Manganèse
Microscopie confocale Raman
Polyalkydes
Polymérisation par oxydation
Revêtements en phase aqueuse
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : The application of a dinuclear manganese complex (MnMeTACN) as a catalyst in the oxidative drying of alkyd coatings is described. Experimental results on the film properties (drying time and film hardness) for various solvent- and water-borne alkyd coatings demonstrate that MnMeTACN is a potential alternative for commercially-available Co- and Mn-based catalysts. MnMeTACN appears to be suitable for both water-borne and solvent-borne alkyd systems. Confocal Raman microscopy is used to study the depth profile of the drying of alkyd coatings catalysed by different catalysts, and it has been found that slow surface drying is somewhat compensated by relatively fast deep layer drying. Note de contenu : - EXPERIMENTAL : Materials - Sample preparation - Confocal Raman microscopy - Drying tests of alkyd resin-based paints
- RESULTS AND DISCUSSIONS : Effect of various catalysts on the drying of alkyd resins followed by CRM - Depth profiling during the drying of solvent-borne alkyd resins - Depth profiling during the drying of water-borne alkyd resins - Implications from surface versus deep-layer drying - Drying tests and film properties of alkyd coatings
- Table 1 : Drying tesls and lilm properties of a solvent-borne shorl-oil alkyd resinbased paint (URALAC AK 429 WX 55)
- Table 2 : Drying tesls and lilm properties of a solvent-borne long-oil alkyd resinbased paint (SETAL 16 LV WS-70)
- Table 3 : Drying tesls and lilm properties of a short-oil alkyd emulsion-based paint (URADIL AZ 554 Z 50)
- Table 4 : Drying tests and lilm properties of a long-oil alkyd emulsion-based paint (URADIL AZ 516 Z-60)DOI : 10.1007/BF02699583 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699583.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5406
in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 88, B4 (12/2005) . - p. 269-275[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003404 - Périodique Bibliothèque principale Documentaires Disponible Stratum corneum occlusion induces water transformation towards lower bonding state : a molecular level in vivo study by confocal Raman microspectroscopy / C. Choe in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 42, N° 5 (10/2021)
[article]
Titre : Stratum corneum occlusion induces water transformation towards lower bonding state : a molecular level in vivo study by confocal Raman microspectroscopy Type de document : document électronique Auteurs : C. Choe, Auteur ; J. Schleusener, Auteur ; S. Choe, Auteur ; J. Ri, Auteur ; Jürgen Lademann, Auteur ; Maxim E. Darvin, Auteur Année de publication : 2020 Article en page(s) : p. 482-493 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Barrière cutanée
Cornéocytes
Dermo-cosmétologie
Gonflement (physique)
Huile essentielle d'amande douce
Jojoba et constituants
Microscopie confocale Raman
Peau -- Physiologie
Pénétration (physique)
VaselineIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : It is conventionally understood that occlusive effects are the retention of excessive water in the stratum corneum (SC), the increase of SC thickness (swelling) and a decrease of the transepidermal water loss. However, the influence of occlusion on water binding properties in the SC is unknown.
- Methods : The action of plant-derived jojoba and almond oils, as well as mineral-derived paraffin oil and petrolatum topically applied on human skin, is investigated in vivo using confocal Raman microspectroscopy. To understand the oils' influence on the SC on the molecular level, the depth-dependent hydrogen bonding states of water in the SC and their relationship to the conformation of keratin, concentration of natural moisturizing factor (NMF) molecules and lipid organization were investigated.
- Results : A significant SC swelling was observed only in petrolatum-treated skin. The water concentration was increased in oil-treated skin in the intermediate SC region (40-70% SC depth). Meanwhile, the amount of free, weakly and tightly bound water increased, and strongly bound water decreased in the uppermost SC region (0-30% SC depth). The NMF concentration of oil-treated skin was significantly lower at 50-70% SC depth. The lateral organization of lipids in oil-treated skin was lower at 0-30% SC depth. The secondary structure of keratin was changed towards an increase of β-sheet content in mineral-derived oil-treated skin and changed towards an increase of α-helix content in plant-derived oil-treated skin.
- Conclusion : The occlusive properties can be summarized as the increase of free water and the transformation of water from a more strongly to a more weakly hydrogen bonding state in the uppermost SC, although some oils cause insignificant changes of the SC thickness. The accompanied changes in the keratin conformation at the intermediate swelling region of the SC also emphasize the role of keratin in the SC's water-transporting system, that is the water in the SC transports intercellularly and intracellularly in the intermediate swelling region and only intercellularly in the uppermost non-swelling region. Bearing this in mind, almond, jojoba and paraffin oils, which are not occlusive from the conventional viewpoint, have an occlusion effect similar to petrolatum on the SC.Note de contenu : - MATERIALS AND METHODS : Applied substances - Volunteers - Confocal Raman microspectroscopy - Data analysis - Statistical analysis
- RESULTS : SC thickness - Depth profiles of water and NMF - Water mobility and the hydrogen bonding state of water - Secondary structure of keratin - Tertiary structure of keratin
- DISCUSSION : Effect of oil occlusion on the hydrogen bonding states of water molecules - Effect of oil application on the secondary and tertiary structure of keratin - Swelling of corneocytes and water binding with NMF, lipids and keratin
- Table 1 : The SC thickness (μm) of untreated skin and skin treated with four different oils in μm. The symbol '*' denotes P-values < 0.05, the symbol '**' denotes P-values < 0.01 between oil-treated and untreated skin
- Table 2 : Raman features measured on the pure oils and untreated SC. The symbol '–' means absence of Raman contributionDOI : https://doi.org/10.1111/ics.12653 En ligne : https://drive.google.com/file/d/1y9mzYrs5yKXHSjToWDknu7oksvfM7fVK/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35413
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 42, N° 5 (10/2021) . - p. 482-493[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire A study of the diffusion behaviour of reactive dyes in cellulose fibres using confocal Raman microscopy / Binfan Yang in COLORATION TECHNOLOGY, Vol. 136, N° 6 (12/2020)
[article]
Titre : A study of the diffusion behaviour of reactive dyes in cellulose fibres using confocal Raman microscopy Type de document : texte imprimé Auteurs : Binfan Yang, Auteur ; Yamin Dai, Auteur ; Yi Zhong, Auteur ; Linping Zhang, Auteur ; Hong Xu, Auteur ; Bijia Wang, Auteur ; Xiaofeng Sui, Auteur ; Xueling Feng, Auteur ; Zhize Chen, Auteur ; Zhiping Mao, Auteur Année de publication : 2020 Article en page(s) : p. 503-511 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Colorants réactifs
Diffusion (physique)
Fibres cellulosiques
Microscopie confocale Raman
Morphologie (matériaux)
Produits chimiques -- Purification
Teinture -- Fibres textiles synthétiquesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Confocal Raman microscopy was used as a non-destructive tool for in situ investigation of the diffusion of CI Reactive Blue 194 in viscose fibres. Dyed fibres were analysed by Raman depth imaging along the radius at different dyeing times (30, 60, 90, 120, 150, 180, 240, 300, 600, 900, 1200, 1500, 1800, 2100 and 2400 seconds) and temperatures (30, 40, 50, 60, 70 and 80°C). The dye concentration in the fibre was expressed by normalising the characteristic peak of dyes at 1577 cm−1 to eliminate the interference of the fibre. The Raman depth mapping images showed that dye molecules gradually diffused to the interior of the fibre with an increase in dyeing time, remaining ring-shaped in the state of diffusion. In addition, the diffusion rate increased with increases in the dyeing temperature. This was understandable because dye molecules with a higher kinetic energy move faster. It was also found that the external structure of fibres played a significant role in the diffusion behaviour of CI Reactive Blue 194 during the initial stage of dyeing. The concentration gradient distribution of CI Reactive Blue 194 in the fibre was reflected by Raman depth mapping. The study demonstrates the potential of confocal Raman microscopy for monitoring the dynamic diffusion of dye molecules in fibres. Note de contenu : - EXPERIMENTAL : Dye purification - Preparation of dyed fibres - Confocal Raman microscopy - Scanning electron microscopy
- RESULTS AND DISCUSSION : Morphology structure characterisation of viscose fibres - Raman depth mapping of reactive dyes in the viscose fibres - Raman intensity distributionDOI : https://doi.org/10.1111/cote.12503 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12503 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34704
in COLORATION TECHNOLOGY > Vol. 136, N° 6 (12/2020) . - p. 503-511[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22386 - Périodique Bibliothèque principale Documentaires Disponible