| Titre : |
Fact and fancy about lamellar emulsions - A closer look inside |
| Type de document : |
texte imprimé |
| Auteurs : |
Sebastian Johannes Beckers, Auteur ; Achim Friedrich, Auteur ; Joachim Venzmer, Auteur |
| Année de publication : |
2022 |
| Article en page(s) : |
p. 40-44 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Emulsifiants
Emulsions -- Emploi en cosmétologie
Ester de polyglycérol
Formulation (Génie chimique)
Ingrédients cosmétiques
Stabilisants (chimie)
|
| Index. décimale : |
668.5 Parfums et cosmétiques |
| Résumé : |
Motivated by the hype about lamellar emulsions, we wanted to take a closer look at the microstructure of modern cosmetic emulsions stabilized by polyglycerol ester emulsifiers. Previously, we have developed a structure model of an emulsion stabilized by a polyglycerol ester emulsifier and consistency enhancers by using a number of highly specialized (e.g. scattering) methods. According to these results, the oil droplets are surrounded by several, irregularly spaced bilayers consisting of emulsifier and consistency enhancer. We now have extended this work to four alternative polyglycerol ester emulsifiers by using Cryo-TEM to study the microstructure of model emulsions. In none of the cases there was evidence for areas of stacked bilayers, i.e. a lamellar phase or multilamellar vesicles, which could be recognized by birefringence (e.g. Maltese crosses) in polarization microcopy if they were present. Such lamellar phases or multilamellar vesicles can be generated by overdosing the emulsifier, or could be a consequence of incomplete mixing. Therefore, polarization microcopy results can hardly be an indication for superior application performance and should not be confused with claim substantiation. |
| Note de contenu : |
- What are "lamellar emulsions" ?
- Molecular architecture determines the types of surfactant aggregate
- What are "lamellar emulsions" ?
- A deep dive into the structure of o/w-emulsions
- How general are these findings ?
- Table 1 : Composition of the model formulations used |
| En ligne : |
https://drive.google.com/file/d/1JL2FPEpk72Y5haOaLVqKS2Bg25aOCO7z/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37195 |
in SOFW JOURNAL > Vol. 148, N° 3 (03/2022) . - p. 40-44
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