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INTERNATIONAL JOURNAL OF COSMETIC SCIENCE / Société Française de Cosmétologie . Vol. 42, N° 4Mention de date : 08/2020Paru le : 25/08/2020 |
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Ajouter le résultat dans votre panierInfluence of cosmetic formulations on the skin's circadian clock in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 42, N° 4 (08/2020)
[article]
Titre : Influence of cosmetic formulations on the skin's circadian clock Type de document : document électronique Année de publication : 2020 Article en page(s) : p. 313-319 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biomolécules actives
Epiderme
Peau -- Soins et hygiène
Rythmes circadiensIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : The circadian rhythm was set into focus by awarding the Nobel Price of Physiology/Medicine to Jeffrey Hall, Michael Rosbash and Michael Young in late 2017. Numerous publications elucidated the molecular mechanisms driving the circadian biorhythms of our body, peripheral organs and each single cell. However, there is minor knowledge on the circadian rhythm of the skin, which has its own peripheral circadian clock in contact with cosmetic formulations. The skin's epidermal clock is excessively influenced by environmental factors like UV radiation or modern lifestyle, which may induce epidermal jetlag. Here, we give an overview on the current knowledge about the epidermal circadian clock and provide a cosmetic solution to protect and preserve the biorhythm of the skin.
- Methods : Quantitative RT-PCR to analyse the gene expression of circadian clock genes and the downstream DNA repair gene OGG1 in keratinocytes irradiated with UV-B. In vivo study to determine skin parameters dependent on the circadian cycle and interference of cosmetic formulations to them by assessment of morning and evening values at each measurement day after 28, 56 and 84 days of the study.
- Results : UV-B irradiation leads to a pronounced delay in circadian clock and downstream gene expression which interferes in the proper function of epidermal stem cells and as thus skin function. The use of a cosmetic active ingredient prevents cyclobutane pyrimidine dimer formation, protects epidermal stem cells and resets the circadian gene expression. It preserves the circadian changes in skin hydration, reduces daily fluctuations of skin redness and strengthens the skin barrier.
- Conclusion : The skin has its own circadian biorhythm to gain full functionality. Interruption of this oscillation will lead to functional impairments. Here we show a cosmetic solution to protect and preserve the skin's circadian rhythm. DNA protection, ROS elimination and stimulation of circadian gene expression seem to be crucial to keep the skin in balance.Note de contenu : - INTRODUCTION : The central circadian clock - The biochemical steering of the circadian clock - The circadian clock in the epidermis - UV radiation impacts the circadian clock - Epidermal Jetlag - A cosmetic active to preserve the skin’s circadian clock
- MATERIALS AND METHODS
- RESULTS AND DISCUSSION : Gene expression of circadian genes - Circadian changes in human skin parameters - Final discussion: Can we draw circadian conclusions from the data ?DOI : https://doi.org/10.1111/ics.12623 En ligne : https://drive.google.com/file/d/1JSsX3C6jU_HqWYRib6rpAfv4SA8K9PAG/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35282
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 42, N° 4 (08/2020) . - p. 313-319[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Investigations of vegetable tannins as hair dyes and their interactions with pre-bleached hair fibres / L. Sargsyan in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 42, N° 4 (08/2020)
[article]
Titre : Investigations of vegetable tannins as hair dyes and their interactions with pre-bleached hair fibres Type de document : document électronique Auteurs : L. Sargsyan, Auteur ; Volkmar Vill, Auteur ; Thomas Hippe, Auteur Année de publication : 2020 Article en page(s) : p. 320-327 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cheveux -- Teinture
Colorants végétaux
Cosmétiques
Mordançage (teinture)
Produits capillaires
Spectrophotométrie
Tanins végétauxIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : The aim of this work was to investigate an alternative hair-dyeing method with vegetable colourants as the tannins, as well as the impact of pre-treatment as the bleaching process.
- Methods : Untreated, 1, 2 and 3 times bleached hair tresses that were dyed with tannins in combination with metal salts were characterized. The wash fastness and the colour strength of the vegetable-dyed hair tresses were spectrophotometrically investigated.
- Results : To determine the colour strength KS and the wash fastness of vegetable-dyed and pre-bleached hair tresses, a three-dimensional colour coordinate system - CIELab - which describes the visual spectra is used. The distance between two colours in the CIELab colour space is expressed by ∆E-values, which are used to identify the wash fastness of the vegetable dye. The hair tresses that had been 3 times pre-bleached showed the highest colour strength and the best wash fastness. The fixation of the tannin–mordant complexes on the hair fibre proceeded effectively just when the hair tresses were bleached before the dying process. It is suggested that the sulphonic acid groups, which increase after bleaching hair, interact with the tannin–mordant hair dye and lead to stronger cross-links between keratinous fibres and tannin–mordant complexes. It was observed that the colour strength of the vegetable-dyed tresses correlates with the bleaching process.
- Conclusion : The presented results demonstrate that the fixation of the vegetable tannin–mordant dying solution on the hair fibres succeed effectively on pre-bleached hair tresses.Note de contenu : - MATERIALS AND METHODS : Hair tresses - Bleaching application - Dyeing application - Wash fastness of vegetable-dyed hair tresses - Colour measurement - Statistical analysis
- RESULTS AND DISCUSSION : Investigation of the impact of pre-bleaching hair samples and dying with mimosa powder extract and different mordants - Wash fastness Mimosa–iron(II)-lactate - Statistical analysis of colour fixation of bleached hair tresses
- Fig. 1 : Plausible interactions of keratinous fibre with tannin–mordant complex
- Fig. 2 : Colour strength of multiple pre-bleached hair tresses with mimosa and iron(II)-lactate dyed with the photographs of the REF
- Fig. 3 : Colour strength of multiple pre-bleached hair tresses with mimosa and iron(III)-sulphate dyed with the photographs of the REF
- Fig. 4 : Colour strength of multiple pre-bleached hair tresses with mimosa and potassium titanium oxalate dyed with the photographs of the REF
- Fig. 5 : Possible interactions between bleached keratinous hair fibre and vegetable tannin–mordant dye system
- Fig. 6 : Box and whisker plot of colour change ∆E hair tresses of 0 to 3 times pre-bleached after dyed with 1% mimosa and 1% iron(II)-lactate solutions with corresponding photographs of the hair tresses (n = 10). SE, standard error
- Fig. 7 : Box and whisker plot of colour change ∆E hair tresses of 0 to 3 times pre-bleached after dyed with 1% mimosa and 1% potassium titanium oxalate dihydrate solutions with corresponding photographs of the hair tresses (n = 10). SE, standard error
- Fig. 8 : Box and whisker plot of colour change ∆E hair tresses of 0 to 3 times pre-bleached after dyed with 1% mimosa and 1% iron(III)-sulphate solutions with corresponding photographs of the hair tresses (n = 10). SE, standard error
DOI : https://doi.org/10.1111/ics.12624 En ligne : https://drive.google.com/file/d/1XPVgSd60X1-txn7WwXmdEg6XcpGowHuh/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35283
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 42, N° 4 (08/2020) . - p. 320-327[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Adapting epicutaneous patch testing protocols to assess immediate-type skin reactions / Annette Mehling in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 42, N° 4 (08/2020)
[article]
Titre : Adapting epicutaneous patch testing protocols to assess immediate-type skin reactions Type de document : document électronique Auteurs : Annette Mehling, Auteur ; S. Benard, Auteur ; N. Braun, Auteur ; Joachim Degwert, Auteur ; M. Duttine, Auteur ; Claudia Jassoy, Auteur ; H. Merk, Auteur ; U. Rossow, Auteur ; Jessica Welzel, Auteur ; W. Wigger-Alberti, Auteur ; Klaus-Peter Wilhelm, Auteur ; J. Ennen, Auteur Année de publication : 2020 Article en page(s) : p. 328-335 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dermatite de contact
Emulsions -- Emploi en cosmétologie
Patchs cosmétiques
Peau -- Physiologie
Produits de beauté
Tests de compatibilité
Tests de sécurité
UrticaireL’urticaire est une maladie inflammatoire de la peau qui se traduit par des épisodes de plaques rouges et de démangeaisons sur la peau. Ces épisodes sont des poussées ou des « éruptions cutanées ».
Au cours de chaque éruption, les plaques sont rouges ou rosées, arrondies, en relief (« papules ») et bien limitées. Elles sont souvent associées à des démangeaisons (« prurit »), comme après une brûlure d’orties. Les lésions d'urticaire ont pour caractéristiques de changer de place au fil des heures en dessinant des cercles ou des arabesques rouges sur la peau.
L’éruption touche généralement la surface de la peau, mais elle peut parfois s’étendre en profondeur ou gagner le revêtement des orifices du visage : les muqueuses. Les lésions prennent alors un aspect particulier, devenant plus boursouflées ou œdémateuses alors que les rougeurs sont moins importantes. On parle alors « d’œdème de Quincke » ou « d’angio-œdème ». Cette forme d’urticaire siège principalement sur le visage : paupières, lèvres, bouche et gorge (luette et pharynx). Quand l’urticaire touche la gorge, le risque est que l’œdème et son gonflement entraînent une gène à la respiration.
La réaction de la peau (ou des muqueuses) est provoquée par l’activation de cellules immunitaires qui sont normalement présentes au niveau des couches superficielles de la peau : les « mastocytes ». Lorsque les mastocytes sont au repos, la peau est normale, mais lorsqu'ils sont activés par certains facteurs, ils vont libérer des substances, et en particulier l'histamine, substances qui vont déclencher la crise d’urticaire.Index. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : During the development of cosmetic formulations, in vitro and in vivo methods are essential tools used to reliably assess the skin irritation potential of a product or ingredient. Epicutaneous patch testing (single and/or multiple application protocols) has long been used as an initial in vivo method to screen for possible skin irritation properties of a substance or formulation. To confirm the mildness and dermatological and/or consumer acceptance of a product, use tests are often subsequently conducted. A study was therefore initiated to see how well patch test results correlate with use tests with respect to irritation elicited by skincare (leave-on) products.
- Methods/results : A number of different cosmetic formulations were assessed in both tests. Although the patch test results did not indicate substantial irritation potentials, immediate-type reactions (stinging and redness) were observed in some volunteers which disappeared within approx. 1 h. Although transient, these reactions suggested that consumer acceptance would probably be low and the studies were discontinued. Immediate-type reactions are rare but have been described for some substances used in cosmetics. These unexpected results were nevertheless intriguing and prompted the start of a journey to see if patch test protocols could be modified to assess these reactions. An occlusive short-term patch test protocol with an application period of 20 min was developed. Successful identification of the spontaneous reactions became possible. Furthermore, there was a correlation between the intensity of reactions observed in the short-term patch test and those observed in the controlled in-use studies. Short-term patch testing using the developed protocol can therefore reliably be used as a screening method, for example in the development and optimization of cosmetic formulations containing ingredients that could cause spontaneous reactions, for instance of non-immunological contact urticaria type.
- Conclusion : The lessons learned from this studies indicate that simple modifications of existing test protocols can lead to important insights into skin reactions. These modifications can then be used to create further building blocks in the development and optimization of test strategies for cosmetic formulations which offer reliable study designs for possible reactions product developers may encounter.Note de contenu : - MATERIALS
- METHODS : Ethics and general design - Test subjects - Single application epicutaneous 24-h patch test (Single EPI 24 h) and multiple application epicutaneous patch test (Multiple EPI) - Short-term in-use study (Short-term USE) and long-term in-use study (Long-term USE) - Short-term epicutaneous patch test (Short-term EPI 20 min) - Data analysis
- RESULTS : Determination of the skin irritation potential in the Single EPI 24 h and Multiple EPI - Determination of the skin compatibility in the Short-term USE test - Short-term EPI: Alternative to Single EPI 24 h and Multiple EPI ? - Skin irritation results with a formulation containing a higher concentration of the suspected urticant - Results of epicutaneous patch test versus long-term USE - Importance for interpretation
- Table 1. Irritation grading scale
- Table 2. Sex, age and skin type distribution of test subjects
- Table 3. Mean intensity scores after patch test removal or after short‐term exposure under use conditions
- Table 4. Statistical analysis of reaction rates between the different skin compatibility tests
- Table 5. Summary of study results based on percentage of reactions
DOI : https://doi.org/10.1111/ics.12619 En ligne : https://drive.google.com/file/d/1SAHLFHiuh-hYvwdJpeysUvXdeCJYfPlT/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35284
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 42, N° 4 (08/2020) . - p. 328-335[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Eriodictyon angustifolium extract, but not Eriodictyon californicum extract, reduces human hair greying / N. Taguchi in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 42, N° 4 (08/2020)
[article]
Titre : Eriodictyon angustifolium extract, but not Eriodictyon californicum extract, reduces human hair greying Type de document : document électronique Auteurs : N. Taguchi, Auteur ; T. Hata, Auteur ; E. Kamiya, Auteur ; T. Homma, Auteur ; A. Kobayashi, Auteur ; H. Aoki, Auteur ; T. Kunisada, Auteur Année de publication : 2020 Article en page(s) : p. 336-345 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cellules -- Cultures et milieux de culture
Cheveux -- Soins et hygiène
Cheveux décolorés
Extraits de plantes:Extraits (pharmacie)
Mélanogénèse
Produits capillaires
Statistique
StérubineLa stérubine (S-7-méthoxy-3',4',5-trihydroxyflavanone) est une flavanone (C16H14O6) qui a la capacité de masquer l'amertume de composé amer.
Cette flavanone a été identifiée dans un extrait des feuilles de l'Herba Santa (Eriodictyon californicum)2, une plante poussant dans le nord du Mexique et dans l'État de Californie3.
Dans cette même plante, trois autres flavonoïdes ont été identifiés avec la même capacité à modifier le goût : l'ériodictyol, l'homoériodictyol et son sel de sodium (homoériodictyol sodique)2.
La flavanone est extraite par un solvant non miscible avec l'eau, ensuite les corps gras sont éliminés. L'extrait est éventuellement préépuré sur charbon actif, puis traité avec une solution à base de sodium ionique. Pour finir, le sel de sodium d'homoériodictyol est précipité et purifié par reprécipitation ou cristallisation à température inférieure à 40 °C. (Wikipedia)Index. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : Yerba Santa (Eriodictyon angustifolium and Eriodictyon californicum) has been used for many years in traditional medicine. However, the effect of Yerba Santa on melanogenesis has not yet been investigated. We aimed to assess the biological effects of Yerba Santa on hair pigmentation.
- Methods : Yerba Santa extracts were assessed for their cytological effects following X-ray irradiation treatment and then tested directly for the prevention of human hair greying. Ultra-performance liquid chromatography (UPLC) was utilized to identify the individual extract components.
- Results : Eriodictyon angustifolium extract significantly increased melanin synthesis in the melanoma cell line through activation of the WNT/MITF/tyrosinase-signalling pathway. In contrast, E. californicum had no effect on melanin synthesis. E. angustifolium extract also demonstrated a protective effect against the damage induced by X-ray irradiation in human keratinocytes. Application of the extracts to subjects who had grey beards demonstrated a reduced number of grey beard hair per year specifically with the E. angustifolium extract. A significant decrease in grey head hair was also observed after application of E. angustifolium extract. Upregulation of gene expression related to melanin production and WNT signalling was observed after the application of E. angustifolium extract. Sterubin was the most abundant flavonoid detected by UPLC in E. angustifolium extract. In addition, sterubin showed the highest difference in terms of quantity, between E. angustifolium and E. californicum extract.
- Conclusion : Eriodictyon angustifolium extract, which is abundant in sterubin, may be suitable as a potential cosmetic and medical agent for the prevention and improvement of hair greying.Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of the plant extracts - Cell culsture - Measurement of cellular melanin - Immunohistochemistry - Measurement of cH2AX activation in normal human epidermal keratinocytes after irradiation - Measurement of reactive oxygen species (ROS) - Assessment of mitochondrial mass - Clinical testing - Gene expression analysis - Ultra-performance liquid chromatography (UPLC) of Yerba Santa extract - LabCyte MELANO-MODEL - Statistical analysis
- RESULTS : Ea but not Ec extract increases melanin synthesis and WNT, MITF and TYR expression in a human melanoma cell line - Ea extract shows a suppressive effect on radiation-induced DNA damage and cell death in normal human epithelial keratinocytes - Effect of Ea extract for the prevention and improvement of human beard hair greying - Effect of Ea extract on the prevention and improvement of human head hair greying - Gene expression analysis after Ea and Ec extract application to human skin - The flavonoid compound sterubin is the active component of Ea extract for protection against hair greyingDOI : https://doi.org/10.1111/ics.12620 En ligne : https://drive.google.com/file/d/1lDv84Hi8NfsBnbDLNKlJe4ZEbUhOogAs/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35285
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 42, N° 4 (08/2020) . - p. 336-345[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Improved two-dimensional electrophoretic mapping of Japanese human hair proteins ; application to curved and straight Japanese human hairs ; and protein identification by MALDI MS and MS/MS quadrupole time-of-flight mass spectrometry / W. G. Bryson in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 42, N° 4 (08/2020)
[article]
Titre : Improved two-dimensional electrophoretic mapping of Japanese human hair proteins ; application to curved and straight Japanese human hairs ; and protein identification by MALDI MS and MS/MS quadrupole time-of-flight mass spectrometry Type de document : document électronique Auteurs : W. G. Bryson, Auteur ; A. C. McCormack, Auteur ; J. E. Plowman, Auteur ; A. J. Grosvenor, Auteur ; C. J. Murphy, Auteur ; S. Nagase, Auteur ; T. Itou, Auteur ; K. Koike, Auteur Année de publication : 2020 Article en page(s) : p. 346-358 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bases de données
Cheveux
Electrophorèse
kératinesLa kératine est une protéine, synthétisée et utilisée par de nombreux êtres vivants comme élément de structure, et également l'exemple-type de protéine fibreuse.
La kératine est insoluble, et peut être retrouvée sur l'épiderme de certains animaux, notamment les mammifères, ce qui leur garantit une peau imperméable. Parfois, lors d'une friction trop importante, la kératine se développe à la surface de la peau formant une callosité. Les cellules qui produisent la kératine meurent et sont remplacées continuellement. Les morceaux de kératine qui restent emprisonnés dans les cheveux sont couramment appelés des pellicules.
La molécule de kératine est hélicoïdale et fibreuse, elle s'enroule autour d'autres molécules de kératine pour former des filaments intermédiaires. Ces protéines contiennent un haut taux d'acides aminés à base de soufre, principalement la cystéine, qui forment un pont disulfure entre les molécules, conférant sa rigidité à l'ensemble. La chevelure humaine est constituée à 14 % de cystéine.
Il y a deux principales formes de kératines : l'alpha-kératine, ou α-keratin, présente chez les mammifères notamment, dont l'humain, et la bêta-kératine, ou β-keratin, que l'on retrouve chez les reptiles et les oiseaux. Ces deux types de kératines ne présentent clairement pas d'homologie de séquence.
Chez l'être humain, la kératine est fabriquée par les kératinocytes, cellules se trouvant dans la couche profonde de l'épiderme. Les kératinocytes absorbent la mélanine (pigment fabriqué par les mélanocytes), se colorent et ainsi cette pigmentation de l'épiderme permet de protéger les kératinocytes des rayons ultraviolets du Soleil. (Wikipedia)
Protéines
Spectrométrie de masseIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Objectives : To evaluate improved protein extraction and two-dimensional electrophoresis (2DE) separation methods with Japanese reference human hair (JRH); to determine whether fibre curvature is related to protein composition in curly and straight Japanese women’s human hair (JHH) samples; and to identify proteins from JRH 2DE maps and expression differences between curly and straight JHH.
- Methods : Hair keratin and keratin-associated proteins (KAPs) were extracted intact with dithiothreitol or tris(2-carboxyethyl) phosphine from JRH or from curved or straight JHH. Extracted proteins were isoelectric-focused on first-dimensional pH gradient gel strips, then separated by molecular weight on laboratory-made, second-dimension, large format gels. The software compared protein abundance between duplicate 2DE gels of curved and straight JHH.
Thirty-eight proteins from a JRH 2DE gel were enzyme-cleaved for MALDI-TOF-MS analysis to determine peptide composition, and where possible, de novo sequencing gave peptide sequence data. An in-house human hair protein database incorporating ninety-eight annotated protein sequences assisted MS analysis.
- Results : 2DE gels of tris(2-carboxyethyl) phosphine-extracted JRH improved keratin and KAP resolution and number compared to those of dithiothreitol-extracted JRH and published commercially made second-dimensional gels.
Silver-stained 2DE gels of the straight or curved JHH sets were remarkably similar. Over-staining to reveal basic proteins caused poor resolution of the major acidic protein classes. Software comparisons of fifty-nine resolved proteins revealed two were significantly different in abundance between curved and straight hairs but in insufficient amounts for MS analysis. MS identified twelve proteins from a JRH CBBG-stained 2DE gel: six type II keratins, three type I keratins and three high sulphur proteins. A further eight were potential conformational isoforms and isoelectric variants of the identified proteins bringing the total to twenty identified or partially identified proteins.
- Conclusion : Root-end human hair extraction with tris(2-carboxyethyl) phosphine improves protein resolution and visualizes more proteins on large format 2DE gels. The two minor protein differences between duplicate straight or curved JHH 2DE gels were unlikely to change fibre structure from straight to curved hair.
MS results confirmed that multiple isoforms exist of various hair proteins. Low sequence coverage prevented distinction between members in rows of homologous protein spots of similar molecular weight.Note de contenu : - MATERIALS AND METHODS : Materials - Japanese human scalp hair samples - JHH protein extraction methods - Large format 2DE method for the separation of hair proteins from JRH and JHH - Comparative analysis of protein expression with 2DE gel software - 2DE gel analysis of curved and straight whole-fibre JHH sample sets - The contribution of the cellular components to the total fibre volume of JHH - Mass spectrometric identification of JRH and JHH 2DE-resolved proteins
- RESULTS AND DISCUSSION : The contribution of cellular components to the total fibre volume of JRH - Hair protein separations on 2DE gels - Mass spectral analysis of JRH proteinsDOI : https://doi.org/10.1111/ics.12621 En ligne : https://drive.google.com/file/d/1xpiPo1HnSTYk-I5vdpQ3POHVJz5r4jPy/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35286
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 42, N° 4 (08/2020) . - p. 346-358[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Comprehensive histological investigation of age-related changes in dermal extracellular matrix and muscle fibers in the upper lip vermilion / T. Gomi in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 42, N° 4 (08/2020)
[article]
Titre : Comprehensive histological investigation of age-related changes in dermal extracellular matrix and muscle fibers in the upper lip vermilion Type de document : document électronique Auteurs : T. Gomi, Auteur ; Toru Imamura, Auteur Année de publication : 2020 Article en page(s) : p. 359-368 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Lèvres -- Vieillissement
Peau -- analyse
Peau -- Physiologie
Statistiques
Vermillon
Vieillissement cutanéIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : Few histological studies have directly examined age-related changes within the lips, although non-invasive investigations of such changes are increasing. Therefore, this study aimed to provide histological and molecular data on age-dependent alterations in the vermilion.
- Methods : Upper vermilion specimens from 15 female Caucasian cadavers (age range, 27–78 years) were investigated histologically or immunohistochemically.
- Results : Histologically, age-dependent decreases in areas occupied by hyaluronan and collagenous fibres in the dermis of upper vermilion were demonstrated. Elastic fibre content varied widely between individuals. The area occupied by muscle fibres in the orbicularis oris muscle region within the vermilion also correlated negatively with age. Immunohistochemically, signals of four proteins were attenuated in vermilion from older individuals compared with young individuals: procollagen type I, hyaluronan synthase (HAS)1, myosin heavy chain (MYH)2 (a component of fast-twitch oxidative muscle fibres) and MYH7 (a component of slow-twitch muscle fibres). In contrast, signals of cell migration inducing hyaluronidase 1 (CEMIP) were intensified in vermilion from older individuals. No marked differences between young and older individuals were seen in procollagen type III, HAS2, HAS3, hyaluronidase (HYAL)1, HYAL2, MYH1 or MYH4.
- Conclusion : Age-dependent decreases of hyaluronan in the dermis of vermilion were prominent, possibly due to both the decrease in synthesis (HAS1) and the increase in degradation (CEMIP). Furthermore, age-dependent decreases in collagenous fibres and two types of muscle fibre in the vermilion were also identified histologically. Type I collagen, MYH2 and MYH7 appear to represent the molecules responsible for these respective decrements.Note de contenu : - MATERIALS AND METHODS : Tissue samples - Histology - Hyaluronan analysis - Immunofluorescence - Statistics
- RESULTS : Deteriorated collagenous fibres in the dermis of upper lip vermilion from older individuals - High variation of elastic fibres in the dermis of upper lip vermilion between individuals - Age‐dependent decrease in hyaluronan in the dermis of upper lip vermilion - Decreased MYH2 and MYH7 in the OOM in vermilion from older individualsDOI : https://doi.org/10.1111/ics.12622 En ligne : https://drive.google.com/file/d/1b0ckDT7LHQP9W4GUYfP0YoeMZ4YgUZ4v/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35287
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 42, N° 4 (08/2020) . - p. 359-368[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Microneedle patch based on dissolving, detachable microneedle technology for improved skin quality - Part 1 : ex vivo safety evaluation / V. Zvezdin in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 42, N° 4 (08/2020)
[article]
Titre : Microneedle patch based on dissolving, detachable microneedle technology for improved skin quality - Part 1 : ex vivo safety evaluation Type de document : document électronique Auteurs : V. Zvezdin, Auteur ; Laurent Peno-Mazzarino, Auteur ; N. Radionov, Auteur ; T. Kasatkina, Auteur ; I. Kasatkin, Auteur Année de publication : 2020 Article en page(s) : p. 369-376 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse d'image L'analyse d'image est la reconnaissance des éléments contenus dans l'image. Il ne faut pas confondre analyse (décomposition en éléments) et traitement (action sur les composantes) de l'image.
Colorants
Evaluation
Explant de peau
Ferulique, AcideL'acide férulique est un acide organique présent, lui ou ses esters, dans de nombreuses plantes. Ce dérivé de l'acide cinnamique participe à la synthèse de la lignine qui forme les parois des cellules végétales et est un précurseur de molécules aromatiques. Son nom provient de Ferula, un genre de plantes herbacées de la famille des Apiacées.
L'acide férulique est un phénylpropanoïde, plus précisément un dérivé de l'acide cinnamique. Il s'agit d'un groupe acrylique lié à un cycle phényle substitué par un groupe hydroxy et un groupe méthoxy, ce qui rend sa structure extrêmement proche de celle de l'acide caféique (à partir duquel il est d'ailleurs biosynthétisé), la seule différence étant un groupe méthoxy à la place d'un groupe hydroxy. Sa structure est aussi très proche de celle de la curcumine.
L'acide férulique, comme l'acide dihydroférulique, est un composé de la lignocellulose, qui sert à faire le lien entre la lignine et les polysaccharides, ce qui confère leur solidité aux parois des cellules végétales. Il est présent dans de nombreuses graines comme le riz, le blé, l'avoine mais aussi dans le café, les pommes, les artichauts, les cacahouètes, les oranges et les ananas. Il est d'ailleurs possible d'extraire l'acide férulique du son de blé ou de maïs en utilisant des bases concentrées (soude, potasse). La biosynthèse de l'acide férulique se fait par méthoxylation de la fonction hydroxy meta de l'acide caféique grâce à une enzyme spécifique, l'acide caféique-O-méthyl transférase.
L'acide férulique est aussi un intermédiaire dans la synthèse des monolignols (en particulier de l'alcool coniférylique qui est obtenu par double réduction de l'acide férulique), c'est-à -dire les monomères de la lignine, et il est aussi utilisé dans la synthèse des lignanes.
L'acide férulique, comme de nombreux phénols, est un antioxydant dans le sens où il est réactif avec les radicaux libres comme les dérivés réactifs de l'oxygène (DRO).
Fluorescence
Hyaluronique, acideL'acide hyaluronique est un type de polysaccharide (plus précisément une glycosaminoglycane) non fixé à une protéine centrale et largement réparti parmi les tissus conjonctifs, épithéliaux et nerveux animaux.
Il se trouve notamment dans l'humeur vitrée et le liquide synovial. Il est l'un des principaux composants de la matrice extracellulaire ainsi que de certaines mucoprotéines lorsqu'il est associé à une fraction protéique.
Depuis les années 1990, il est très utilisé dans divers dispositifs médicaux, médicamenteux et cosmétiques (présenté dans ce dernier cas comme "antistatique, humectant, hydratant, conditionneur cutané, anti-âge, etc."), bénéficiant d'un effet de mode grandement soutenu par une large publicité commerciale.
Contribuant de façon significative à la prolifération et à la migration des cellules, l'acide hyaluronique est aussi impliqué dans la progression de certains cancers. (Wikipedia)
Innocuité
Isothiocyanate de fluorescéineL'isothiocyanate de fluorescéine (FITC, fluorescein isothiocyanate en anglais) est un dérivé de la fluorescéine utilisée dans un large spectre d'applications comme la cytométrie en flux. Le FITC est une molécule de fluorescéine fonctionnalisée avec un groupe réactif isothiocyanate (-N=C=S), remplaçant un atome d'hydrogène sur le cycle le plus bas de la structure. Ce dérivé réagit avec les nucléophiles comme les groupes amines et sulfhydryles des protéines.
Un groupe fonctionnel succinimidyle-ester greffé au noyau fluorescéine, créant le NHS-fluorescéine, forme un autre dérivé commun réagissant avec les amines, possédant une plus grande spécificité envers les amines primaires en présence d'autres nucléophiles.
Le FITC possède un pic d'excitation et d'émission à 495 nm et 521 nm respectivement. Comme la plupart des fluorochromes, il est sujet au photobleaching. Par conséquent, des dérivés de la fluorescéine tels que l'Alexa 488 et le DyLight 488 ont été optimisés pour des applications chimiques et biologiques nécessitant une plus grande photostabilité, une plus grande intensité de fluorescence ou l'ajout de groupements différents.
Patchs à micro-aiguilles
Patchs cosmétiquesIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : The aim of the paper presented herein is the description and safety evaluation of the process of dissolution of an 86-microneedle patch composed of hyaluronic acid, when applied topically to human abdominal skin explants. Such explants were chosen to replace the inability of obtaining periorbital skin. In order to evaluate penetration and dissolution of the microneedles, we employed histochemical methods and a fluorescent dye FITC (fluorescein isothiocyanate).
- Methods : Abdominoplasty human skin explants were treated with square microneedle patches with a 1.5-cm2 surface area, containing 86 microneedles and having 450 ± 23.5 µm in height with 1 mm interspacing between nearest neighbouring microneedles. Histological processing and staining for cell viability, FITC distributions and glycosaminoglycans were performed. The stained surface percentage for each treatment was compared to control untreated samples at given time points. A Mann–Whitney test was used to identify the difference between two populations (sites of skin samples punctured with stained and clear microneedles, respectively) at the given level of statistical significance (P < 0.05).
- Results : The application of the MN patch to excised skin explants showed these microneedles to be non-invasive into the dermis of the skin. Skin puncturing with MN patches revealed 17 different sites of microneedle penetration immediately afterwards and 4 sites, 2 h later. Although there were some variances in the epidermal depth of penetration, these variances did not impact on cell viability. The hyaluronic acid-based microneedles having 450 µm in length penetrated the epidermis at an averaged depth by 26 µm without disrupting skin cell viability and without causing an inflammatory response. Hyaluronic acid could be detected in most of these penetration sites, with no diffusion into the dermis, which is important for cosmetic applications. FITC analysis uncovered fluorescein isothiocyanate distribution within microneedle insertion site, which remained steady after 2 and 6 h of experimentation.
- Conclusion : Using ex vivo tracer staining studies, we have shown that the evaluated microneedle applicator is capable of penetrating the skin epidermis and delivering substances embedded in the needle polymer matrix. In addition, the tested product was shown to be safe, which provides a broad perspective for delivering cosmetic and pharmaceutic agents.Note de contenu : - MATERIALS AND METHODS : Explant preparation - Test product - Product application - Sampling and histological processing - Cell viability - Distribution of FITC marker - Acidic Glycosaminoglycan (GAG) staining - Image analysis
- RESULTS : Cell viability - FITC distribution - Acidic Glycosaminoglycan (GAG) stainingDOI : https://doi.org/10.1111/ics.12627 En ligne : https://drive.google.com/file/d/15zHz7_pDNnn2RmVZKgfZz6ve-wM2bDxA/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35288
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 42, N° 4 (08/2020) . - p. 369-376[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Thiamidol containing treatment regimens in facial hyperpigmentation : An international multi-centre approach consisting of a double-blind, controlled, split-face study and of an open-label, real-world study / W. G. Philipp-Dormston in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 42, N° 4 (08/2020)
[article]
Titre : Thiamidol containing treatment regimens in facial hyperpigmentation : An international multi-centre approach consisting of a double-blind, controlled, split-face study and of an open-label, real-world study Type de document : document électronique Auteurs : W. G. Philipp-Dormston, Auteur ; A. Vila Echagüe, Auteur ; S. H. Pérez Damonte, Auteur ; J. Riedel, Auteur ; A. Filbry, Auteur ; K. Warnke, Auteur ; C. Lofrano, Auteur ; D. Roggenkamp, Auteur ; G. Nippel, Auteur Année de publication : 2020 Article en page(s) : p. 377-387 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dermo-cosmétologie
Emulsions -- Emploi en cosmétologie
Peau -- Physiologie
Pigmentation, Troubles de la
Rugosité
Thiamidol
Visage -- Soins et hygièneIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : Tyrosinase is the rate-limiting enzyme in melanogenesis. Thiamidol is the most potent inhibitor of human tyrosinase out of 50 000 tested compounds. In clinical studies, it was shown to improve facial hyperpigmentation, post-inflammatory hyperpigmentation and age spots significantly. To identify the optimal number of daily Thiamidol applications, we conducted a split-face study comparing the efficacy and tolerability of four-times with two-times daily application. Subsequently, we evaluated the efficacy and tolerability of a typical face care regimen containing Thiamidol in a real-world study.
- Methods : The split-face study was double-blind, randomized, controlled, including two Thiamidol containing products (serum and day care SPF 30). The serum was applied twice daily on one half of the face and the day care SPF30 twice-daily on the whole face. The real-world study was open-label, observational, including three Thiamidol containing products (day care SPF 30 in the morning, serum and night care in the evening). In both studies, subjects with mild-to-moderate facial hyperpigmentation applied the products over 12 weeks. Assessments included clinical and subjective grading of hyperpigmentation, skin condition, hemi-/modified MASI, chromameter and clinical photography.
- Results : In the split-face study (n = 34), hyperpigmentation, skin roughness and hMASI improved all significantly (P < 0.001) versus baseline, with first visible results after two weeks of twice-daily application. The four-times daily application led to significant improvement versus the two-times daily application. In the real-world study (n = 83), all evaluated parameters, including skin condition and chromametry (n = 30), improved significantly (P < 0.001) in comparison with baseline and the corresponding preceding visits. The subjects judged the cosmetic properties of the products positively. In both studies, the products were well tolerated.
- Conclusion : Four-times daily Thiamidol improves facial hyperpigmentation significantly more than two-times daily and is well tolerated by the subjects. The real-world study with a typical face care regimen containing Thiamidol shows improvement of facial hyperpigmentation and confirms tolerability. Furthermore, the data provide evidence for the suitability of this three-product Thiamidol regimen for day-to-day life.Note de contenu : - MATERIALS AND METHODS : Split-face study - Real-world study - Statistics
- RESULTS : Split-face study - Real-world study
- Table 1 : Overview of methods of the two studies (split-face and real-world)
- Table 2 : INCI composition of the test products
- Table 3 : Demographic characteristics of the subjects of both studies (splitface and real-world)
- Table 4 : Self-grading of product performanceDOI : https://doi.org/10.1111/ics.12626 En ligne : https://drive.google.com/file/d/1qaZx6p66xka-JhsDsVVOmJVwNg88ZpiO/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35289
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 42, N° 4 (08/2020) . - p. 377-387[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire The anti-ageing effects of a natural peptide discovered by artificial intelligence / K. Kennedy in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 42, N° 4 (08/2020)
[article]
Titre : The anti-ageing effects of a natural peptide discovered by artificial intelligence Type de document : document électronique Auteurs : K. Kennedy, Auteur ; R. Cal, Auteur ; R. Casey, Auteur ; C. Lopez, Auteur ; A. Adelfio, Auteur ; B. Molloy, Auteur ; A. M. Wall, Auteur ; T. A. Holton, Auteur ; N. Khaldi, Auteur Année de publication : 2020 Article en page(s) : p. 388-398 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antiâge
Cellules -- Cultures et milieux de culture
Composés organiques -- Synthèse
Dermo-cosmétologie
Elisa, TestLe test ELISA est une méthode de laboratoire qualifiée d'immuno-enzymatique. Il s'agit d'un test immunologique, car il a pour principal objectif de mettre en évidence la présence d'anticorps ou d'antigènes spécifiques à une pathologie, dans un échantillon de sang. Cet examen utilise une protéine appelée enzyme, qui va se fixer à certains constituants spécifiques de la maladie, et par repérage et quantification de cette enzyme, la maladie pourra être affirmée, ainsi que son intensité évaluée.
Génétique
Intelligence artificielle
Justification de l'allégation
Peau -- Soins et hygiène
Peptides
Protéines
ProtéomiqueLa protéomique désigne la science qui étudie les protéomes, c'est-à -dire l'ensemble des protéines d'une cellule, d'un organite, d'un tissu, d'un organe ou d'un organisme à un moment donné et sous des conditions données.
Dans la pratique, la protéomique s'attache à identifier de manière globale les protéines extraites d'une culture cellulaire, d'un tissu ou d'un fluide biologique, leur localisation dans les compartiments cellulaires, leurs éventuelles modifications post-traductionnelles ainsi que leur quantité.
Elle permet de quantifier les variations de leur taux d'expression en fonction du temps, de leur environnement, de leur état de développement, de leur état physiologique et pathologique, de l'espèce d'origine. Elle étudie aussi les interactions que les protéines ont avec d'autres protéines, avec l'ADN ou l'ARN, ou d'autres substances.
La protéomique fonctionnelle étudie les fonctions de chaque protéine.
La protéomique étudie enfin la structure primaire, secondaire et tertiaire des protéines. (Wikipedia)Index. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : As skin ages, impaired extracellular matrix (ECM) protein synthesis and increased action of degradative enzymes manifest as atrophy, wrinkling and laxity. There is mounting evidence for the functional role of exogenous peptides across many areas, including in offsetting the effects of cutaneous ageing. Here, using an artificial intelligence (AI) approach, we identified peptide RTE62G (pep_RTE62G), a naturally occurring, unmodified peptide with ECM stimulatory properties. The AI-predicted anti-ageing properties of pep_RTE62G were then validated through in vitro, ex vivo and proof of concept clinical testing.
- Methods : A deep learning approach was applied to unlock pep_RTE62G from a plant source, Pisum sativum (pea). Cell culture assays of human dermal fibroblasts (HDFs) and keratinocytes (HaCaTs) were subsequently used to evaluate the in vitro effect of pep_RTE62G. Distinct activities such as cell proliferation and ECM protein production properties were determined by ELISA assays. Cell migration was assessed using a wound healing assay, while ECM protein synthesis and gene expression were analysed, respectively, by immunofluorescence microscopy and PCR. Immunohistochemistry of human skin explants was employed to further investigate the induction of ECM proteins by pep_RTE62G ex vivo. Finally, the clinical effect of pep_RTE626 was evaluated in a proof of concept 28-day pilot study.
- Results : In vitro testing confirmed that pep_RTE62G is an effective multi-functional anti-ageing ingredient. In HaCaTs, pep_RTE62G treatment significantly increases both cellular proliferation and migration. Similarly, in HDFs, pep_RTE62G consistently induced the neosynthesis of ECM protein elastin and collagen, effects that are upheld in human skin explants. Lastly, in our proof of concept clinical study, application of pep_RTE626 over 28 days demonstrated anti-wrinkle and collagen stimulatory potential.
- Conclusion : pep_RTE62G represents a natural, unmodified peptide with AI-predicted and experimentally validated anti-ageing properties. Our results affirm the utility of AI in the discovery of novel, functional topical ingredients.Note de contenu : - METHODS : Deep learning : classifier training and peptide prediction - Cell culture - BrdU cell proliferation assay - Scratch wound assay - Elastin and hydroxyproline ELISA - RNA Isolation and real-time QPCR - Immunofluorescence staining - Human skin explants - Statistics - Pilot human clinical study
- RESULTS : A peptide from the pea proteome with anti-ageing potential - Pep_RTE62G stimulates keratinocyte proliferation and migration - Pep_RTE62G induces the production of the ECM proteins - ECM protein stimulation capacity of pep_RTE62G is upheld ex vivo - pep_RTE62G suggests clinical anti-ageing effectsDOI : https://doi.org/10.1111/ics.12635 En ligne : https://drive.google.com/file/d/1rZMFrbwynbE27D_nfWjee7As_m8Xb_7d/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35290
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 42, N° 4 (08/2020) . - p. 388-398[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Pigmentation effects of blue light irradiation on skin and how to protect against them / Remo Campiche in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 42, N° 4 (08/2020)
[article]
Titre : Pigmentation effects of blue light irradiation on skin and how to protect against them Type de document : document électronique Auteurs : Remo Campiche, Auteur ; S. J. Curpen, Auteur ; V. Lutchmanen-Kolanthan, Auteur ; Sarah Gougeon, Auteur ; Marie Cherel, Auteur ; G. Laurent, Auteur ; Mathias Gempeler, Auteur ; R. Schuetz, Auteur Année de publication : 2020 Article en page(s) : p. 399-406 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Algues d'eau douce
Biomolécules actives
Formulation (Génie chimique)
Lumière artificielle -- Effets physiologiques
Lumière bleue
Nicotinamide
Pigmentation, Troubles de la
StatistiqueIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Background : Visible light, in particular blue light, has been identified as an additional contributor to cutaneous photoageing. However, clinical studies demonstrating the clear effect of blue light on photoageing are still scarce, and so far, most studies have focused on broad-spectrum visible light. Although there is evidence for increased skin pigmentation, the underlying mechanisms of photoageing in vivo are still unclear. Furthermore, there is still a need for active ingredients to significantly protect against blue light-induced hyperpigmentation in vivo.
Our study had two aims: to detect visible changes in skin pigmentation following repeated irradiation of the skin with LED-based blue light and to reduce pigmentation using suitable active ingredients.
- Method : We conducted a randomized, double-blind and placebo-controlled clinical study on 33 female volunteers with skin phototypes III and IV. We used a repetitive blue light (4 × 60 J cm−2, 450 nm) irradiation protocol on the volunteers’ inner forearms. Using hyperspectral imaging, we assessed chromophore status. In addition, we took chromameter measurements and photographs to assess visible hyperpigmentation.
- Results : We measured significant changes in chromophore status (P < 0.001 vs baseline), that is of melanin, haemoglobin and oxygen saturation, immediately after blue light irradiation. In addition, we found visible skin colour changes which were expressed by a significant decrease in ITA° values (delta ITA° = -16.89, P < 0.001 vs baseline for the placebo group) and an increase in a* (delta a* = +3.37, P < 0.001 vs baseline for the placebo group) 24 h post-irradiation. Hyperpigmentation and skin reddening were mitigated by both a formulation containing 3% of a microalgal product and a formulation containing 3% niacinamide.
- Conclusion : Our study sets out an efficient and robust protocol for investigating both blue light-induced cutaneous alterations, such as changes in skin chromophores, and signs of photoageing, such as hyperpigmentation. Moreover, we have shown evidence that both an extract of the microalga Scenedesmus rubescens and niacinamide (vitamin B3) have the potential to protect against blue light-induced hyperpigmentation.Note de contenu : - MATERIALS AND METHODS : Test compounds - Blue light source - Clinical study design - Statistical analysis
- RESULTS : Blue light‐induced changes in skin chromophores - Blue light‐induced changes in skin colour
- Table 1 : Formulations used in this studyDOI : https://doi.org/10.1111/ics.12637 En ligne : https://drive.google.com/file/d/1LwcZLPEyAn7hYOz0vljrQ_rPWJ1WpkLk/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35291
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 42, N° 4 (08/2020) . - p. 399-406[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Engineering rheological response in chitosan-sophorolipid systems through controlled interactions / S. Pingali in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 42, N° 4 (08/2020)
[article]
Titre : Engineering rheological response in chitosan-sophorolipid systems through controlled interactions Type de document : document électronique Auteurs : S. Pingali, Auteur ; A. M. Benhur, Auteur ; S. Amin, Auteur Année de publication : 2020 Article en page(s) : p. 407-414 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biopolymères
Biosurfactants
ChitosaneLe chitosane ou chitosan est un polyoside composé de la distribution aléatoire de D-glucosamine liée en ß-(1-4) (unité désacétylée) et de N-acétyl-D-glucosamine (unité acétylée). Il est produit par désacétylation chimique (en milieu alcalin) ou enzymatique de la chitine, le composant de l'exosquelette des arthropodes (crustacés) ou de l'endosquelette des céphalopodes (calmars...) ou encore de la paroi des champignons. Cette matière première est déminéralisée par traitement à l'acide chlorhydrique, puis déprotéinée en présence de soude ou de potasse et enfin décolorée grâce à un agent oxydant. Le degré d'acétylation (DA) est le pourcentage d'unités acétylées par rapport au nombre d'unités totales, il peut être déterminé par spectroscopie infrarouge à transformée de Fourier (IR-TF) ou par un titrage par une base forte. La frontière entre chitosane et chitine correspond à un DA de 50 % : en deçà le composé est nommé chitosane, au-delà , chitine. Le chitosane est soluble en milieu acide contrairement à la chitine qui est insoluble. Il est important de faire la distinction entre le degré d'acétylation (DA) et le degré de déacétylation (DD). L'un étant l'inverse de l'autre c'est-à -dire que du chitosane ayant un DD de 85 %, possède 15 % de groupements acétyles et 85 % de groupements amines sur ses chaînes.
Le chitosane est biodégradable et biocompatible (notamment hémocompatible). Il est également bactériostatique et fongistatique.
Le chitosane est également utilisé pour le traitement des eaux usées par filtration ainsi que dans divers domaines comme la cosmétique, la diététique et la médecine.
Rhéologie
Rhéomètres
Sophorolipides
Viscoélasticité
ViscositéIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : The purpose of this study was to understand the impact of the biopolymer chitosan on the rheological behaviour of the biosurfactant sophorolipid as well as the effects of ionization and electrolyte addition on the chitosan–sophorolipid system.
- Methods : Rotation mechanical rheometry was used to study the rheological response of the chitosan–SL systems. Frequency sweeps were conducted to analyse the rheological properties of the system at low-frequency ranges, and bulk viscosity of the system was studied at high shear rates for each sample.
- Results : The biosurfactant sophorolipid on its own has very low viscosity. The bulk rheology results show that the addition of chitosan enhances the viscosity and viscoelastic properties of the chitosan–sophorolipid system indicating the presence of synergistic interactions between the two systems. Electrolyte addition had a significant impact on the system’s rheological response. Addition of salt built the viscosity of pure chitosan. However due to charge screening effects, it resulted in a decrease in viscosity for the chitosan–sophorolipid system. On further increasing the salt concentration, an increase in viscosity was observed but not beyond the value obtained for the chitosan–SL system without any salt. An increase in pH results in increased ionization of the carboxylic acid groups in acidic SL, which in turn enhances the synergistic interactions between chitosan and SL.
- Conclusion : The strong charge interactions between chitosan and sophorolipid lead to formation of an integrated gel-like network, thus building the viscosity of the system. A variation in parameters like biopolymer concentration, electrolyte and ionic strength has the potential to modify the bulk rheological properties of the chitosan-SL system.Note de contenu : - MATERIALS AND METHODS : Effect of ratio - Effect of salt - Effect of pH - Technique
- RESULTS AND DISCUSSION : Effect of ratio - Effect of salt - Effect of pH
- Table 1 : Composition of chitosan–SL systems
- Table 2 C: omposition of chitosan–SL–salt systemsDOI : https://doi.org/10.1111/ics.12640 En ligne : https://drive.google.com/file/d/1CjGcsphodoRv_Sv1o_cNdTaU5sYr-eaT/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35292
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 42, N° 4 (08/2020) . - p. 407-414[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire 3D-Printed Franz cells – update on optimization of manufacture and evaluation / Bruno C. Sil in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 42, N° 4 (08/2020)
[article]
Titre : 3D-Printed Franz cells – update on optimization of manufacture and evaluation Type de document : document électronique Auteurs : Bruno C. Sil, Auteur ; R. G. Belgrave, Auteur ; M. P. Alvarez, Auteur ; L. Luo, Auteur ; M. Cristofoli, Auteur ; M. R. Penny, Auteur ; David J. Moore, Auteur ; Jonathan Hadgraft, Auteur ; S. T. Hilton, Auteur ; Majella E. Lane, Auteur Année de publication : 2020 Article en page(s) : p. 415-419 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Etude in vitro
Franz, Cellules de
Impression tridimensionnelle
Microscopie électronique à balayage
PerméationIndex. décimale : 668.5 Parfums et cosmétiques Résumé : Objectives : Laboratory in vitro permeation processes require the use of modified Franz type diffusion cells which are conventionally fabricated from glass. Fragility and high cost are frequently associated with this type of laboratory apparatus. The purpose of our present research was to develop a simple, economical and versatile approach to manufacture Franz type cells using additive manufacturing (AM).
- Methods : Graphical Franz diffusion cell designs were reproduced with a stereolithography (SLA) 3D printer and assessed over a minimum period of 24 h. The surface morphology of AM printouts was analysed before and after compatibility studies using scanning electron microscopy (SEM). Comparative permeation studies in both glass and AM Franz type diffusion cells were conducted using a caffeine solution (1.5 mg mL‑1), applied to a model silicone membrane.
- Results : Testing of the 3D printed scaffolds confirmed similar recovery of the permeant when compared to glass cells : 1.49 ± 0.01 and 1.50 ± 0.01 mg mL-1, respectively, after 72 h. No significant differences were visible from the SEM micrographs demonstrating consistent, smooth and non-porous surfaces of the AM Franz cells’ core structure. Permeation studies using transparent 3D printed constructs resulted in 12.85 ± 0.53 µg cm2 caffeine recovery in the receptor solution after 180 min with comparable permeant recovery, 11.49 ± 1.04 µg cm2, for the glass homologues.
- Conclusion : AM constructs can be considered as viable alternatives to the use of conventional glass apparatus offering a simple, reproducible and cost-effective method of replicating specialised laboratory glassware. A wider range of permeants will be investigated in future studies with these novel 3D printed Franz diffusion cells.Note de contenu : - Fig. 1 : AM Franz diffusion type cell design generated in TinkerCADâ„¢ and cell printout top view
- Fig. 2 : Sputter coated AM Franz type diffusion cell attached onto adhesive carbon disk before SEM imaging with x and y axis cut edges
- Fig. 3 : Amount in mg mL-1 of CAF recovery from glass and 3D-printed receptor compartments at 0, 24, 48 and 72 h (n = 4, mean ± SD)
- Fig. 4 : SEM micrographs of AM Franz type diffusion cell from pre-compatibility study
- Fig. 5 : Amount of CAF permeation from initial dose per cm2 of PDMS membrane at 0, 15, 30, 45, 60, 90, 120 and 180 min using glass and 3D-printed Franz type diffusion cells (n = 4, mean ± SD)
- Table 1 : Physicochemical properties of caffeine (CAF)DOI : https://doi.org/10.1111/ics.12618 En ligne : https://drive.google.com/file/d/1G4mhxCFDUQpMS9OngbSGQVSQxKM4PR4q/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35293
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 42, N° 4 (08/2020) . - p. 415-419[article]Exemplaires
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