蒺藜果呋甾皂苷的分离鉴定及含量测定研究
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摘要
目的:研究蒺藜(Tribulus terrestris L.)果实中呋甾皂苷的分离纯化及结构鉴定,从中选定一种呋甾皂苷作为对照品,并建立该呋甾皂苷含量测定方法,为蒺藜药材的质量提供方法控制。
     方法:利用各种现代分离技术,包括大孔树脂、硅胶、ODS、Sephadex LH-20、HPLC等技术,从中药蒺藜果中分离呋甾皂苷类成分,并进一步通过现代波谱技术(1H NMR,13CNMR,ESI-MS,HMBC,HMQC)鉴定呋甾皂苷化合物的结构,并采用反相高效液相色谱法建立蒺藜皂苷K的含量测定方法。
     结果:从蒺藜果中分离5个呋甾皂苷化合物,经波谱鉴定了4个呋甾皂苷的结构。4个化合物结构分别为:26-O-β-D-吡喃葡萄糖基-(25R)-5α-呋甾烷-20(22)-烯-12-酮-2α,3β,26-三醇-3-O-β-D-吡喃葡萄糖基(1→4)-β-D-吡喃半乳糖苷(Ⅰ);26-O-β-D-吡喃葡萄糖基-(25R)-5α-呋甾烷-20(22)-烯-12-酮-3β,26-二醇-3- O-β-D-吡喃半乳糖糖基(1→2)-β-D-吡喃葡萄糖基(1→4)-β-D-吡喃半乳糖苷(Ⅱ);26-O-β-D-吡喃葡萄糖基-(25S)-5α-呋甾烷-20(22)-烯-12-酮-3β,26-二醇-3 -O-β-D-吡喃半乳糖糖基(1→2)-β-D-吡喃葡萄糖基(1→4)-β-D-吡喃半乳糖苷(Ⅲ);26-O-β-D-吡喃葡萄糖基-(25R)-5α-呋甾烷-20(22)-烯-2α,3β, 26-三醇-3-O-β-D-吡喃葡萄糖基(1→2)-O-β-D-吡喃葡萄糖基(1→4)-β-D-吡喃半乳糖苷(Ⅳ)。其中选择含量较高纯度在98 %以上的蒺藜皂苷K为对照品,方法学考察证明蒺藜皂苷K在1.1~5.5μg范围内呈良好的线性关系(r = 0.9991),平均回收率为95.76 % (n = 6),RSD = 0.50 %。
     结论:化合物Ⅰ为新化合物。5个化合物中,选定化合物Ⅲ(蒺藜皂苷K)作为对照品,建立了蒺藜皂苷K的含量测定方法,结果表明该方法准确、可靠,灵敏度高,重现性好。
Purpose: To study furostanol saponins from the fruits of Tribulus terrestris L. and select terrestrosin K (Ⅲ) as the reference substance to establish the HPLC determination method of its content for the quality control of Tribulus terrestris L..
     Method: By the modern chromatography techniques (silica gel, macroporous resin, Sephadex LH-20, ODS and preparative HPLC, etc), furostanol saponins were isolated from the fruits of Tribulus terrestris L.. The structures of these compounds were elucidated by the spectroscopic analysis (1H NMR, 13C NMR, ESIMS, HMQC and HMBC) and chemical methods. High performance liquid chromatography (HPLC) was used to determinate the content of terrestrosin K (Ⅲ).
     Result: Five furostanol saponins were isolated from the fruits of Tribulus terrestris L. Four compounds of them were identificated as: 26-O-β-D-glucopyranosyl-(25R)-5α-furostan -20(22)-en-12-one-2α,3β,26-triol-3-O-β-D-glucopyranosyl(1→4)-β-D-galactopyranoside(Ⅰ);26-O-β-D-glucopyranosyl-(25R)-5α-furostan-20(22)–en-12-one-3β,26-diol-3-O-β-D-galacto- pyranosyl-(1→2)-β-D-glucopyranosyl(1→4)-β-D-galactopyranoside(Ⅱ);26-O-β-D-glucopyr-anosyl-(25S)-5α-furostan-20(22)-en-12–one-3β-26-diol-3-O-β-D-galactopyranosyl(1→2)-β- D-glucopyranosyl(1→4)-β-D-galactopyranoside(Ⅲ);26-O-β-D-glucopyranosyl-(25R)-5α-fur- ostan-20(22)-en-2α,3β,26-triol-3-O-β-D-glucopyranosyl(1→2)-β-D-glucopyranosyl(1→4)-β- D-galactopyranoside (Ⅳ). Terrestrosin K (Ⅲ) with high content and purity (﹥98﹪) was selected as the reference substance.The methodology investigation showed that the linearity was obtained over the range of 1.1~5.5μg (r = 0.9991), the average recovery was 95.76 % (n = 6), and RSD = 0.50 %.
     Conclusion: CompoundⅠis a new compound. Terrestrosin K (Ⅲ) was selected as the reference substance. The HPLC method of its content determination was established. The method is accurate and reliable, and has a high sensitivity and good reproducibility.
引文
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