Provided is a ceramide emulsion containing the following components (A), (B) and (C) and not containing an acrylic acid polymer or a phospholipid:
(A) sphingosines represented by Formula (1):
(wherein R1 represents a hydrocarbon group having 4 to 30 carbon atoms which is optionally substituted with a hydroxyl group and the like; Y represents CH2, CH or O; X1, X2 and X3 represent H, a hydroxyl group or an acetoxy group; X4 represents H, an acetyl group or a glyceryl group or, together with an adjacent O atom, forms an oxo group; R2 and R3 represent H, a hydroxyl group, a hydroxymethyl group or an acetoxymethyl group; groups "R"s are H or an amidino group or represent a hydrocarbon group having 1 to 8 carbon atoms which may have a substituent such as a hydroxyl group and the like; and "a" is 2 or 3),
(B) an acidic compound selected from inorganic acids and organic acids having a molecular weight of 200 or less, and
(C) ceramides represented by Formula (2):
(wherein R7 represents a hydrocarbon group having 4 to 30 carbon atoms which is optionally substituted with a hydroxyl group and the like; Z represents CH2, CH or O; X5, X6 and X7 represent H, a hydroxyl group or an acetoxy group, X4 represents H, an acetyl group or a glyceryl group or, together with an adjacent O atom, forms an oxo group; R8 and R9 represent H, a hydroxyl group, a hydroxymethyl group or an acetoxymethyl group; R10 represents a hydrocarbon group having 5 to 60 carbon atoms which is optionally substituted with a hydroxyl group and the like; and R11 represents H or a hydrocarbon group having 1 to 8 carbon atoms which optionally have a substituent such as a hydroxyl group and the like).
本发明提供了一种神经酰胺乳液,它含有以下成分(A)、(B)和(C),且不含
丙烯酸聚合物或
磷脂:
(A) 由式(1)代表的鞘
磷脂:
(其中 R1 代表具有 4 至 30 个碳原子的烃基,该烃基可任选被羟基等取代;Y 代表
CH2、CH 或 O;X1、X2 和 X3 代表 H、羟基或乙酰氧基;X4 代表 H、乙酰基或
甘油基,或与邻近的 O 原子一起形成氧代基团;R2和R3代表H、羟基、羟甲基或乙酰氧甲基;基团 "R "为H或脒基,或代表具有1至8个碳原子的烃基,该烃基可能具有羟基等取代基;以及 "a "为2或3)、
(B) 选自分子量为 200 或以下的
无机酸和有机酸的酸性化合物,和
(C) 由式(2)代表的神经酰胺:
(其中 R7 代表具有 4 至 30 个碳原子的烃基,该烃基可任选被羟基等取代;Z 代表 、CH 或 O;X5、X6 和 X7 代表 H、羟基或乙酰氧基,X4 代表 H、乙酰基或
甘油基,或与邻近的 O 原子一起形成氧代基团;R8 和 R9 代表 H、羟基、羟甲基或乙酰氧甲基;R10 代表具有 5 至 60 个碳原子的烃基,该烃基可选择被羟基等取代;R11 代表 H 或具有 1 至 8 个碳原子的烃基,该烃基可选择被羟基等取代)。