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3. Choice of encapsulation method
Several encapsulation methods are mentioned in the literature, and are described in this section.
3.1 Adsorption
Once the SMO has been synthesized, the surfactant extracted chemically or by calcination, or sometimes both, the material is impregnated with a solution containing the UV filter solubilized in a solvent (often ethanol). Depending on the volume of solution used, this is referred to as impregnation or wet impregnation (in the latter case, the volume of solution is of the order of the pore volume). To improve adsorption efficiency, successive impregnations can be carried out, the solvent being evaporated between each impregnation
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Choice of encapsulation method
In situ encapsulation of a UV filter in MCM-41 mesoporous silica
Bibliography
- (1) - DEMARCHEZ (M.) - Le rayonnement solaire et la peau : définitions - http://www.biologiedelapeau.fr
- (2) - ROCQUEFELTE (X.), GOUBIN (F.), JOBIC (S.), DEMOURGUES (A.) - AntiUV, rôle, nature et recherches...
Patents
GUARILLOFF (P.), LEBEAU (B.), PATARIN (J.), BONGUR (R.) and MARICHAL-WESTRICH (C.). – Mesoporous vectors containing at least one organic UV filter WO/2009/138513.
International extension :
(WO 2009/138513) MESOPOROUS VECTOR CONTAINING AT LEAST ONE ORGANIC UV-FILTER. 19.11.2009 No IPC Found PCT/EP2009/056004 CHANEL PARFUMS BEAUTE
The present invention relates...
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