Comparison of extraction methods for chemical composition, antibacterial, depigmenting and antioxidant activities of Eryngium maritimum / M. Traversier in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 42, N° 2 (04/2020)  

[article]  inINTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 42, N° 2 (04/2020) . - p. 127-135 Titre : Comparison of extraction methods for chemical composition, antibacterial, depigmenting and antioxidant activities of Eryngium maritimum Type de document : texte imprimé Auteurs : M. Traversier, Auteur ; T. Gaslonde, Auteur ; M. Lecso, Auteur ; S. Michel, Auteur ; Eldra Delannay, Auteur Année de publication : 2020 Article en page(s) : p. 127-135 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antioxydants Biologie végétale Biomolécules actives Chimie analytique Evaluation Extraction (chimie) Ingrédients cosmétiques Index. décimale : 668.5 Parfums et cosmétiques Résumé : - OBJECTIVE : The objective is to develop a natural cosmetic ingredient from Eryngium maritimum regarding the high interest of consumer in these ingredients for cosmetic use. - METHODS : Five eco-friendly techniques of extraction were applied to Eryngium maritimum aerial parts among conventional reflux extraction (with green solvent) and alternative techniques (supercritical fluid extraction (SFE), microwave-assisted extraction (MAE), ultrasound-assisted extraction (UAE) and ultrasound combined with microwave extraction (UAE + MAE)). Several criteria were evaluated to allow the optimal choice for an industrialized ingredient: yield of extraction, chemical composition and biological activities such as antimicrobial, antioxidant, anti-collagenase and anti-tyrosinase activities. The extracts were analysed by liquid chromatography mass spectrometry (LC-HRMS), and the hierarchical Pearson classification (HCA) allowed to highlight the group of metabolites preferably extracted depending on the technique of extraction used. - RESULTS : The biological results highlight that SFE and 80% ethanol reflux extracts have the best responses to biological activities such as antimicrobial, depigmenting and antioxidant activities, followed by water reflux extraction. Their activities might be due to the presence of different groups of metabolites favourably extracted by these techniques. - CONCLUSION : Among these extractions, water reflux extraction provided the optimal results considering the compromise between extraction yield and biological activities for the development of a cosmetic ingredient. Note de contenu : - MATERIALS AND METHODS : Plant material and chemicals - Preparation of extracts - Antioxidant assays - Tyrosinase assay - Collagenase assay - Antibacterial assay - LC-MS analysis - Statistical analysis - RESULTS AND DISCUSSION : LC-MS analysis - Influence of methods of extraction on biological activities - Selection of an optimal ingredient for cosmetic applications DOI : https://doi.org/10.1111/ics.12595 En ligne : https://drive.google.com/file/d/1hdJxSx-WmPUqiOH3qirAndioOBATJTbl/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34503 [article]

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Hyperbranched polyesters as potential additives to control the surface tension of polymers / K. Grundke in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 88, B2 (05/2005)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 88, B2 (05/2005) . - p. 101-106 Titre : Hyperbranched polyesters as potential additives to control the surface tension of polymers Type de document : texte imprimé Auteurs : K. Grundke, Auteur ; P. Kierkus ; M. Kreitschamann, Auteur ; B. Voit, Auteur ; F. Simon, Auteur ; D. Pleul, Auteur ; S. Michel, Auteur ; A. Ziemer, Auteur ; M. Azizi, Auteur Année de publication : 2005 Article en page(s) : p. 101-106 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Polyesters Polymères ramifiés Spectroscopie de photoélectrons Tension superficielle Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, the authors report on the potential application of hyperbranched polymers as surface tension modifiers in linear polymers or compatibilisers in polymer blends. The influence of hyperbranched polyesters (HBP) with different functional end groups on the surface tension of mixtures with an oligo(ester diol) was investigated. The surface tension of the pure components and of the mixtures was studied within a temperature range of 20°C up to 100°C. The results indicate that the surface tension of the pure HBPs strongly depends on the functionality of the end-groups. The modification of the hydroxyl end groups by short alkyl chains (methyl, tert-butyl) reduced the surface tension, depending on the degree of functionalisation. The surface tension of mixtures could be considerably decreased using 1% HBP that was partially substituted with short alkyl chains. In this case, the modified HBPs acted as surface active agents. On the molecular level, the enrichment of the modified HBP in the surface region was proven by XPS (x-ray photoelectron spectroscopy) measurements. DOI : 10.1007/BF02699540 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699540.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5422 [article]

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