Abstract: Microcapsules are produced by forming a wall membrane by the co-polycondensation of a silylated amino acid with a silane compound at an interface between an oily phase and an aqueous phase in an emulsified state and using a dispersed phase of either the oily phase or the aqueous phase as a content encapsulated therein. Provided are: the microcapsules thus produced which are to be used in cosmetics, quasi drugs and drugs, said microcapsules being capable of containing the content encapsulated therein at a high content ratio, showing little leaching out of the content with the lapse of time, showing little odor derived from the capsule wall membrane, exhibiting high storage stability without aggregation or sedimentation when used in cosmetics, and being easy to produce; and a cosmetic comprising the same.

Abstract: A cosmetic substrate composed of a silylated amino acid/silane compound copolymer obtained by poly-condensing at least one silylated amino acid having a specific chemical structure and at least one silane compound having a specific chemical structure, wherein the reaction molar ratio of silylated amino acid:silane compound is in the range of 1:5 to 1:150, and a cosmetic containing 0.01% by mass or more and 20% by mass or less of the cosmetic substrate are provided.