A new complex triterpenoid saponin, polystachyasaponin, was isolated from leaves of Entada polystachya (L.) DC. (Leguminosae) by using chromatographic methods. Its structure was established as 15,16-dihydroxy-3-[[O-β -D-xylopyranosyl-(1→2)-O-α-L-arabinopyranosyl-(1→6)-2- (acetylamino)-2-deoxy-β -D-glucopyranosyl]oxy]-(3β ,15α,16α)-olean-12-en-28-oic acid O-D-apio- β -D-furanosyl-(1→3)-O-β -D-xylopyranosyl-(1→2)-O-[β -D-glucopyranosyl-(1→4)]-6-O-[(2E,6R)- 6-hydroxy-2,6-dimethyl-1-oxo-2,7-octadienyl]-β -D-glucopyranosyl ester. Structural elucidation was performed using detailed analyses of 1H and 13C NMR spectra including 2D NMR spectroscopic techniques and chemical conversions. The hemolytic activity of the saponin was evaluated using in vitro assays, and its adjuvant potential on the cellular immune response against ovalbumin antigen was investigated using in vivo assays.
一种新的复杂三萜皂苷,多穗豆皂苷,通过色谱方法从多穗豆(Entada polystachya(L.)DC.(豆科))的叶子中分离出来。其结构被确定为15,16-二羟基-3-[[O-β-D-木糖苷-(1→2)-O-α-L-阿拉伯糖苷-(1→6)-2-(乙酰氨基)-2-脱氧-β-D-葡萄糖苷基]氧]-(3β,15α,16α)-熊果-12-烯-28-酸O-D-阿匹酰-β-D-呋喃糖苷-(1→3)-O-β-D-木糖苷-(1→2)-O-[β-D-葡萄糖苷-(1→4)]-6-O-[(2E,6R)-6-羟基-2,6-二甲基-1-氧代-2,7-辛二烯基]-β-D-葡萄糖苷酯。通过详细分析1H和13C NMR光谱,包括2D NMR光谱技术和化学转化,进行了结构阐明。使用体外实验评估了皂苷的溶血活性,并使用体内实验调查了其对卵清蛋白抗原细胞免疫反应的佐剂潜力。