Soyasaponins from Soybean Flour Medium for the Liquid Culture of Ganoderma applanatum
作者:So-Young Lee、Ju-Sun Kim、Sang-Hee Shim、Sam-Sik Kang
DOI:10.5012/bkcs.2011.32.10.3650
日期:2011.10.20
Two new unusual soyasaponins named 6"-O-methyldehydrosoyasaponin I(7) and desglucosylsoyasaponin $A_1$ (10) along with eight known saponins, dehydrosoyasaponin IV (1), dehydrosoyasaponin III (= impatienoside A) (2), soyasaponin III (3), dehydrosoyasaponin II (= soyasaponin Bg) (4), soyasaponin II (5), dehydrosoyasaponin I (= soyasaponin Be) (6), soyasaponin I (8), and kudzusaponin $SA_3$ (9), were isolated as their methyl esters and identified from the liquid culture of G. applanatum. Their structures were determined by chemical and spectroscopic analyses including 1D- and 2D-NMR as well as by comparison of their spectroscopic data with those of the reported in literatures. Although dehydrosoyasaponin IV was identified by LC-MS/MS method from soy protein isolate, this is the first report of the isolation of this compound. Dehydrosoyasaponin III (2) and kudzusaponin $SA_3$ (9) were also isolated for the first time from soybean. The presence of soyasaponins in Ganoderma species seems to be unusual feature. Thus, we presumed that compounds 1-10 might all be derived from the defatted soybean flour which was added to the culture medium as a nitrogen source.
两种新的不寻常的大豆皂苷被命名为 6"-O-甲基二氢大豆皂苷 I(7) 和去葡萄糖基大豆皂苷 $A_1$(10) 以及八种已知的皂苷,脱水大豆皂苷 IV (1),脱水大豆皂苷 III (= impatienoside A) (2),大豆皂苷 III (3)、(4)、大豆皂苷 II (5)、脱水酰皂苷 I (=大豆皂苷 Be) (6)、大豆皂苷 I (8)和 kudzusaponin $SA_3$(9)的甲基酯,并从 G. applanatum 的液体培养物中进行了鉴定。applanatum。通过化学和光谱分析(包括一维和二维核磁共振)以及与文献报道的光谱数据进行比较,确定了它们的结构。虽然通过 LC-MS/MS 方法从大豆分离蛋白中鉴定出了脱水酰皂苷 IV,但这是首次报道分离出该化合物。此外,还首次从大豆中分离出脱氢酰基皂苷 III (2) 和 kudzusaponin $SA_3$ (9)。灵芝物种中存在大豆皂甙似乎是一个不寻常的特征。因此,我们推测 1-10 号化合物可能都来自作为氮源添加到培养基中的脱脂大豆粉。