Saponin and sapogenol. XXXVIII. Structure of soyasaponin A2, a bisdesmoside of soyasapogenol A, from soybean, the seeds of Glycine max Merrill.
作者:ISAO KITAGAWA、MASAYUKI SAITO、TOSHIO TANIYAMA、MASAYUKI YOSHIKAWA
DOI:10.1248/cpb.33.598
日期:——
Two new bisdesmosides of soyasapogenol A (1), named soyasaponin A1 and soyasaponin A2 (7), were isolated from soybean, the seeds of Glycine max MERRILL, together with the known soyasaponins I (4), II (5), and III (6). By employing a photochemical degradation method, which is a selective cleavage method for the glucuronide linkage in oligoglycosides, and on the bases of spectral analyses and chemical reactions, the structure of soyasaponin A2 was elucidated as 3-O-[β-D-galactopyranosyl (1→2)-β-D-glucuronopyranosyl]-22-O-[β-D-glucopyranosyl (1→3)-α-L-arabinopyranosyl] soyasapogenol A (7).
从大豆(Glycine max MERRILL的种子)中分离出两种新的大豆皂醇A(1)的双糖苷,命名为大豆皂苷A1和大豆皂苷A2(7),以及已知的大豆皂苷I(4)、II(5)和III(6)。通过采用光化学降解方法,这是一种针对寡糖苷中葡萄糖醛酸键的选择性断裂方法,并基于光谱分析和化学反应,确定了大豆皂苷A2的结构为3-O-[β-D-半乳糖吡喃糖基(1→2)-β-D-葡萄糖醛酸吡喃糖基]-22-O-[β-D-葡萄糖吡喃糖基(1→3)-α-L-阿拉伯糖吡喃糖基]大豆皂醇A(7)。