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目的深入研究耳叶牛皮消中C21甾类化学成分。方法采用硅胶柱色谱、ODS柱色谱和HPLC制备色谱等技术分离纯化耳叶牛皮消的化学成分,经波谱学方法鉴定其化学结构。结果从耳叶牛皮消中分离得到10个化合物,分别鉴定为罗索他明(rostratamine,1)、萝藦米宁(gagaminine,2)、去乙酰基-萝藦苷元(deacetylmetaplexigenin,3)、青阳参苷元(qingyangshengenin,4)、告达亭3-O-β-D-吡喃洋地黄毒糖苷(cautatin 3-O-β-D-digitoxo-pyranoside,5)、告达亭3-O-β-D-吡喃磁麻糖基-(1→4)-β-D-吡喃夹竹桃糖苷(caudatin-3-O-β-D-cymaropyranosyl-(1→4)-β-D-digitoxopyranoside,6)、告达亭3-O-β-D-吡喃磁麻糖基-(1→4)-β-D-吡喃磁麻糖苷(caudatin 3-O-β-D-cymaropyranosyl-(1→4)-β-D-cymaropyranoside,7)、青阳参苷B(otophylloside B,8)、告达亭3-O-β-D-吡喃夹竹桃糖基-(1→4)-β-D-洋地黄毒糖基-(1→4)-β-D-吡喃磁麻糖苷(caudatin 3-O-β-D-oleandropyranosyl-(1→4)-β-D-digitoxopyranosyl-(1→4)-β-D-cymaropyranoside,9)和萝藦米宁3-O-α-L-磁麻吡喃糖基-(1→4)-β-D-磁麻吡喃糖基-(1→4)-β-D-磁麻吡喃糖苷(gagaminine3-O-α-L-cymropyranosyl-(1→4)-β-D-cymropyranosyl-(1→4)-β-D-cymropyranoside,10)。结论化合物1,4,5,6,8,9为首次从耳叶牛皮消中分离得到。