A soyasapogenol composition of this invention contains soyasapogenol B (ingredient A) and 3-O-D-glucuronopyranosyl soyasapogenol B (ingredient B). The weight ratio (ingredient B/ingredient A) of the 3-O-D-glucuronopyranosyl soyasapogenol B to the soyasapogenol B is in the range of 0.001 to 10. The composition can be produced by means of partial decomposition of a sugar chain residue of a soy saponin B group glycoside with acid.本發明之大豆皂醇組成物係包含大豆皂醇B(成分(A))與3-O-D-葡糖醛酸吡喃基(3-O-D-Glucurono pyranosyl)大豆皂醇B(成分(B))。3-O-D-葡糖醛酸吡喃基大豆皂醇B相對於大豆皂醇B的重量比(成分B/成分A)的範圍是0.001~10。上述組成物可以酸部分分解大豆皂素B群組醣苷之醣鏈殘基製得。
