A new bisdesmoside of soyasapogenol B (3), named sophoraflavoside I (2), was isolated together with soyasaponin I (1) from Sophorae Radix (Sophora flavescens AITON, root). By employing a photochemical cleavage method for the glucuronide linkage in 2 and on the bases of chemical reactions and spectral analyses, the structure of sophoraflavoside I has been determined to be 3-O-[α-L-rhamnopyranosyl (1→2)-β-D-galactopyranosyl (1→2)-β-D-glucuronopyranosyl]-22-O-[β-D-glucopyranosyl (1→2)-α-L-arabinopyranosyl] soyasapogenol B (2).
一种新的
大豆皂苷B的双脱糖苷(3),命名为黄豆
黄酮苷I(2),与
大豆皂苷I(1)从菟丝子根(Sophora flavescens AITON,根)中分离出来。通过采用光
化学裂解法处理2中的
葡萄糖醛酸连接基,并基于
化学反应和光谱分析,确定黄豆
黄酮苷I的结构为3-O-[α-L-
甘露糖吡喃糖(1→2)-β-
D-半乳糖吡喃糖(1→2)-β-
D-葡萄糖醛酸吡喃糖]-22-O-[β-
D-葡萄糖吡喃糖(1→2)-α-L-阿拉伯
吡喃糖]
大豆皂苷B(2)。