STRUCTURE OF NUCLEUS-CASING, PREPARATION, DRUG FOR EXTERNAL APPLICATION, ACTIVE PRINCIPLE OF TAPE AND COSMETIC PRODUCT

摘要

a core-shell structure is provided which has excellent fast-acting properties in terms of percutaneous absorption of an active ingredient. a core-shell structure that is provided with a core part containing an active ingredient and a shell part containing a surfactant having an hlb value of 4 to 14. the center part is a solid; and the surfactant has a saturated hydrocarbon group having 7 to 15 carbon atoms or an unsaturated hydrocarbon group having 7 to 17 carbon atoms.