An oil composition containing 70 to 100% by mass of an oil composition (A) which is mainly composed of a steradiene having a 3, 5-conjugated diene structure formed by dehydrating a hydroxyl group at 3-C of phytosterol, while having a phytosterol content of 20% by mass or less, and which is liquid at 25° C., and 0 to 30% by mass of an oil (B) which is soluble in the oil composition (A) has excellent transparency and gloss imparting property, and is useful as an oily base to produce an external preparation for skin. An external preparation for skin which contains the oil composition as an oil base is excellent in gloss and adhesion. The content of the steradiene in the oil composition (A) is usually 60% by mass or more, and is preferably 95% by mass or more.
一种油类组合物含有 70% 至 100% 质量的油类组合物 (A),该组合物主要由具有 3,5-共轭二烯结构的甾二烯组成,该结构由植物甾醇 3-C 处的羟基脱
水形成,同时植物甾醇含量不超过 20% (以质量计),且在 25°C 时为液态;以及 0% 至 30% 质量的油类 (B),该油类可溶于油类组合物 (A)、以及 0-30% 质量分数的油 (B),该油可溶于油组合物 (A),具有极佳的透明度和光泽度,可用作生产皮肤外用制剂的油基。含有该油组合物作为油基的皮肤外用制剂具有极佳的光泽度和附着力。油组合物(A)中的甾二烯含量通常为 60% 或更高,最好为 95% 或更高。