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Marine plant extracts offer superior dermal protection / J. Helen Fitton in PERSONAL CARE EUROPE, Vol. 9, N° 2 (04/2016)
[article]
Titre : Marine plant extracts offer superior dermal protection Type de document : texte imprimé Auteurs : J. Helen Fitton, Auteur ; Damien Stringer, Auteur ; Sam Karpiniec, Auteur Année de publication : 2016 Article en page(s) : p. 101-104 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Algues marines
Antiâge
Antienzymes
Antioxydants
Cicatrisation
Cosmétiques
Extraits de plantes:Extraits (pharmacie)
Fucoïdanesfamille de polymères hétéropolydispersés à base de fucose et d'autres oses ou acides uroniques.
Un fucoïdane, ou une fucoïdine, est un fucane complexe qui appartient à la famille des polymères hétéropolydispersés à base de fucose et d'autres oses ou acides uroniques. Les polymères hétéropolydispersés sont des macromolécules dont les fractions peuvent toujours être séparées en sous-fractions et ainsi de suite jusqu'à aboutir théoriquement à la séparation des molécules.
Malgré cette diversité en taille, de composition et de structure de chacune des molécules, les fractions obtenues avec une méthode donnée ont pourtant des propriétés physico-chimiques toujours parfaitement reproductibles.
Les fucoïdanes tirent leur nom des algues du type fucus, et ils sont souvent assimilés comme des polysaccharides présents dans le wakamé ou d'autres algues brunes de mer. Des formes variantes de fucoïdane ont également été trouvées chez des espèces animales, notamment chez les concombres de mer.
Le fucoïdane est (parfois...) employé en complément alimentaire pour améliorer les échanges cellulaires et leur vitesse d'activité, avec une amélioration du système immunitaire.
(Aquaportail)
Glycation
Inhibiteurs (chimie)
Peau -- Soins et hygiène
Polyphénols
Produits antisolairesIndex. décimale : 668.5 Parfums et cosmétiques Résumé : Two specialty macroalgae-derived extracts have been developed by leading Australian biotechnology company Marinova, for use in cosmetic formulations. Wild-grown Undaria pinnatifida and Fucus vesiculosus macroalgae were sourced to extract two well characterised, certified organic fucoidan compounds : Maritech® Reverse and Maritech® Bright. Maritech® Reverse is a highly sulfated, high purity fucoidan, while Maritech Bright is a high purity compound comprised of both fucoidan and marine polyphenols. Extensive clinical and in vitro testing showed both extracts offer superior cosmeceutical benefits, particularly through anti-glycation, immune boosting and enzyme inhibitory mechanisms and UV protecting and soothing activity. Maritech Reverse was particularly effective at increasing the expression of wound-healing genes, while Maritech Bright was shown to clinically reduce age spot and wrinkle appearance. The demonstrated bioactivity of the extracts at low concentrations, in addition to their certified organic and environmentally sustainable status, position Maritech Bright and Maritech Reverse as two highly valuable ingredients for cosmetic formulations. Note de contenu : - SKIN PROTECTIVE PROPERTIES : Glycation inhibition - UV protecting and soothing effects - Enhanced wound-healing gene expression - Enzyme inhibition - Powerful antioxidant ability - Reduction in wrinlkes and age spots
- ORGANIC AND SUSTAINABLE EXTRACTS
- SAFE AND NON-SENSITISINGEn ligne : https://drive.google.com/file/d/1DWT6YL7TWEz1IN5Ctqh9hV3qEakSlVh5/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26042
in PERSONAL CARE EUROPE > Vol. 9, N° 2 (04/2016) . - p. 101-104[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17938 - Périodique Bibliothèque principale Documentaires Disponible Microencapsulation techniques and their potential in self-healing coatings / Sakshi Arora in PAINTINDIA, Vol. LXX, N° 12 (12/2020)
[article]
Titre : Microencapsulation techniques and their potential in self-healing coatings Type de document : texte imprimé Auteurs : Sakshi Arora, Auteur Année de publication : 2020 Article en page(s) : p. 55-66 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Core-Shell
Inhibiteurs (chimie)
Revêtement autoréparant
Revêtement autoréparant:Peinture autocicatrisanteIndex. décimale : 667.9 Revêtements et enduits Résumé : Microencapsulation can be described as the process of enclosing micron-sized particles of solids or droplets of liquids or gases in an inert shell in order to isolate and protect them from the external environment. The concept of encapsulation of materials is inspired from micro to macro-scale examples in the nature like a seed or a cell for protection against environmental impacts. This technology can be used for valuable applications requiring controlled and targeted release, masking odors and protection of reactive or sensitive additives used for different applications. The fabrication of microcapsules can been attained by chemical, physico-chemical and physico-mechanical processes depending on the nature of the core and the shell materials, efficiency of encapsulation and the shell thickness required. The microencapsulation has found application in numerous fields like adhesives, carbonless copy paper, phase change materials, perfumes with its growing technical readiness for use in the protective coatings. The microcapsules based on shell made up of thermoset resins containing healing agents of different chemical nature (inhibitors) have been investigated to serve as self-healing coatings. This paper reviews the different techniques used for microencapsulation and their applications with an emphasis on its use for the self-healing coatings. Note de contenu : - SYNTHESIS OF MICROCAPSULESynthesis of microcapsules
- CHEMICAL METHODS : Interfacial polymerization
- IN-SITU POLYMERIZATION
- PHYSICO-CHEMICAL METHODS : Layer-by-layer (LBL) - Rapid expansion of supercritical fluids
- PHYSICO-MECHANICAL PROCESSES : Co-extrusion
- SPRAY-DRYING : Top spray - Tangential spray - Spinning disk - Microcapsules for the self-healing coatings - Two component system - Single component system - Application microcapsules in the coating
- Fig. 1 : Cost and complexity comparison of different encapsulation techniques)
- Fig. 2 : Schematic representation of microcapsule
- Fig. 3 : Morphology of microcapsules
- Fig. 4 : Techniques used for microencapsulation
- Fig. 5 : Interfacial polymerization process for microcapsule fabrication
- Fig. 6 : In-situ polymerization process for microcapsule formation
- Fig. 7 : Urea-formaldehyde capsules containing dicyclopentadiene healing agent
- Fig. 8 : Coacervation process for microcapsule formation a. Dispersion of core material in the shell polymer solution b. Separation of polymer rich phase (Coacervate) c. Coating of core material by microdroplets of the coacervate d. Coalescence of coacervate to form continuous shell around the core particles
- Fig. 9 : Layer-by-layer methodology
- Fig. 10 : SiO, nanocontainers and its incorporation in Zr0,/SiO, coating
- Fig. 11 : Microencapsulation by Rapid Expansion of Supercritical Solution (RESS)
- Fig. 12 : Microencapsulation by co-extrusion process
- Fig. 13 : Microencapsultion by spray-drying process
- Fig. 14 : Schematic representation of three types of spraying chamber
- Fig. 15 : Microencapsulation by spanning disk action
- Fig. 16 : Application of microcapsules in coatings
- Table 1 : Particle sizes obtained from differentm icroencapsulation processes
- Table 2 : Two-component healing systems
- Table 3 : Single component healing systems
- Table 4 : Sample matrix as analyzed by Kumar et alEn ligne : https://drive.google.com/file/d/1Ewtp9LSvoV6wMDtCuXL9TlueLm9-6T-m/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35201
in PAINTINDIA > Vol. LXX, N° 12 (12/2020) . - p. 55-66[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22556 - Périodique Bibliothèque principale Documentaires Disponible Monitoring the mode of action of synthetic and natural biocides against Aeromonas hydrophila by Raman spectroscopy and chemometrics / Megha Mehta in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)
[article]
Titre : Monitoring the mode of action of synthetic and natural biocides against Aeromonas hydrophila by Raman spectroscopy and chemometrics Type de document : texte imprimé Auteurs : Megha Mehta, Auteur ; Yang Liu, Auteur ; Mark Waterland, Auteur ; Geoff Holmes, Auteur Année de publication : 2021 Article en page(s) : 15 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aeromonas hydrophila
Analyse multivariée
Antimicrobiens
Chimiométrie
Cuirs et peaux -- Conservation
Huile essentielle d'origan
Inhibiteurs (chimie)
Spectroscopie Raman
Thiocyano-méthylthiobenzotiazoleIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : We have investigated the mode of action of synthetic biocides, (2-(thiocyanomethylthio) benzothiazole(TCMTB), dichlorophen, (commonly used in leather industry for preservation) and natural biocides, oregano and eucalyptus oils, on Aeromonas hydrophila using Raman spectroscopy in collaboration with multivariate analysis and 2D correlation spectroscopy to evaluate whether Raman spectra acquired contained valuable information to study the action of biocides on bacterial cells. The growth of A. hydrophila in clear and outer edge zone of inhibition differ in their reaction with different biocides, which allows us to highlight the differences as a characteristic of two kinds of bacteria. Such classification helps identify oregano oil as the most effective biocide by altering clear and outer edge zone of bacteria. Standard disk diffusion assay method was used for screening biocide bacteria interactions and later analysed by Raman spectroscopy. The paper also presents the introduction of TCMTB and oregano oil into leather processing stages to examine and determine the antimicrobial effect as an application to real-world setting. Therefore, we conclude that Raman spectroscopy with appropriate computational tools constitutes a powerful approach for screening biocides, which provide solutions to all the industries using biocides including leather industry, considering the potentially harmful effect of biocides to humans and the environment. Note de contenu : - MATERIALS AND METHODS : Biocides and bacteria - Biocides, bacteria and leather treatment - Data acquisition and Raman spectral processing
- RESULTS AND DISCUSSION : Disk diffusion agar plate test - Raman spectroscopy identifies biomolecular changes due to biocide treatment - Multivariate analysis - Two-dimensional correlation spectroscopy (2D-COS) - Antimicrobial effect of leather treated with biocides
- Table 1 : Disk diffusion determined zones of inhibition (mm) for A. hydrophila strain after treatment with TCMTB, DCP, oregano oil and eucalyptus oilDOI : https://doi.org/10.1186/s42825-021-00062-3 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00062-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37546
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 15 p.[article]La multivalence, une voie à explorer pour l'inhibition d'enzymes ? / Sébastien Gouin in L'ACTUALITE CHIMIQUE, N° 373 (04/2013)
[article]
Titre : La multivalence, une voie à explorer pour l'inhibition d'enzymes ? Type de document : texte imprimé Auteurs : Sébastien Gouin, Auteur Année de publication : 2013 Article en page(s) : p. 14-17 Note générale : Bibliogr. Langues : Français (fre) Catégories : Antienzymes
GlycosidasesLes Glycoside hydrolases (ou glycosidases) catalysent l'hydrolyse de liaisons glycosidiques et libèrent au moins un composé osidique. Ce sont des enzymes extrêmement communes, dont les rôles sont aussi divers que la dégradation des glucides complexes (cellulose et hémicellulose), les défenses anti-bactériennes (ex. le lysozyme), la pathogénicité (ex. les neuraminidases virales) ou le métabolisme cellulaire (amylases ou enzyme de débranchement du glycogène pour le métabolisme énergétique, mannosidases comme modulateur de glycosylation des protéines, ...). Les glycosyltransférases et les glycosides hydrolases sont les deux classes majeures d'enzymes impliquées dans la synthèse et la rupture des liaisons osidiques.
Iminosucres
Inhibiteurs (chimie)
Valence (chimie théorique)Index. décimale : 547 Chimie organique : classer la biochimie à 574.192 Résumé : Le concept « clé-serrure » proposé fin XIXe-début XXe siècle par Emil Fischer illustre bien la stratégie actuelle du ciblage enzymatique, où des molécules synthétiques sont façonnées pour interagir avec leurs récepteurs de façon complémentaire. Des travaux récents suggèrent une autre possibilité pour gagner en affinité et en sélectivité. La clé fait maintenant place à un trousseau, composé de ligands identiques greffés sur une charpente chimique commune. Note de contenu : - La multivalence, c'est quoi ?
- Comment expliquer le gain d'affinité ?
- L'inhibition multivalente d'enzymes, une réalité ?
- Quel avenir pour les inhibiteurs enzymatiques multivalents ?En ligne : https://new.societechimiquedefrance.fr/numero/la-multivalence-une-voie-a-explore [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18209
in L'ACTUALITE CHIMIQUE > N° 373 (04/2013) . - p. 14-17[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14921 - Périodique Bibliothèque principale Documentaires Disponible Natural sources of melanogenic inhibitors : A systematic review / Cláudio Fernando Goelzer Neto in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 44, N° 2 (04/2022)
[article]
Titre : Natural sources of melanogenic inhibitors : A systematic review Type de document : document électronique Auteurs : Cláudio Fernando Goelzer Neto, Auteur ; Pamela do Nascimento, Auteur ; Verônica Cristina da Silveira, Auteur ; Brugnera Nunes de Mattos Alexandra, Auteur ; Charise Dallazem Bertol, Auteur Année de publication : 2022 Article en page(s) : p. 143-153 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de blanchiment
Anti tyrosinase
Dermo-cosmétologie
Extraits de plantes:Extraits (pharmacie)
Inhibiteurs (chimie)
Mélanogénèse
Peau -- Soins et hygiène
Phénols
Pigmentation, Troubles de la
TyrosinaseIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : Melanin gives some natural protection against the harmful effects of ultraviolet radiation; however, excessive production of melanin causes skin hyperpigmentation. Depigmenting cosmetics can be used to control this process; however, depigmenting agents commonly used have some disadvantages, such as low bioavailability, photosensitization, cellular toxicity, and insolubility. Natural sources of melanogenic inhibitors have become important alternatives to synthetic ones. The objective of this review was to summarize the results of studies on natural extracts that have been reported in the literature to inhibit the process of melanogenesis, giving a view on their suitability for potential use in new cosmetic formulations for skin-lightening.
- Data sources : A systematic literature search was carried out using the descriptors: “melanogenesis”, “tyrosinase”, “tyrosinase inhibition”, and “natural agents”.
- Study selection : Publications were selected based on our designated inclusion and exclusion criteria, and a total of 15 studies met these criteria.
- Data extraction : The following were used in the review of each paper which met the criteria: the name of the plant (all of the natural extracts turned out to be from plants), the method used to obtain the plant extract, the method for evaluating anti-tyrosinase activity, the main results, and the conclusions.
- Data synthesis : All evaluated natural agents demonstrated anti-tyrosinase effect. The species Leathesia difformis, Morus alba, Orostachys japonicus, Heracleum moellendorffii, Coix lacryma-jobi (adlay), Inula brittanica, and Gailardia aristata stood out from the others due to their application as potential inhibitors of more than three proteins related to melanogenesis, including the cyclic adenosine monophosphate response element-binding protein, microphthalmia-associated transcription factor, tyrosinase, tyrosinase-related protein-1, tyrosinase-related protein-2, and dopachrome tautomerase.
- Conclusion : The plants present an anti-tyrosinase effect that must be better explored in the new cosmetic formulations. The anti-melanogenic effects of the plant are mainly related to the presence of phenolic and antioxidant compounds.Note de contenu : - Table 1 : Summary of the studies included in this review emphasizing the methodology, results, and conclusions
-DOI : https://doi.org/10.1111/ics.12763 En ligne : https://drive.google.com/file/d/1j9FdTFRp0KE4vN7isl6OWUT5gVjlWB-q/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37718
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 44, N° 2 (04/2022) . - p. 143-153[article]Neurophroline TM - A biological skin stress inhibitor in SOFW JOURNAL, Vol. 142, N° 11 (11/2016)
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