Preparative isolation of huperzines A and B from Huperzia serrata by displacement centrifugal partition chromatography

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• 作者：Alix Toribio ; Eldra Delannay ; Bernard Richard ; Karen Plé ; Monique Zè ; ches-Hanrot ; Jean-Marc Nuzillard ; Jean-Hugues Renault
• 关键词：Huperzia serrata ; Huperzine A ; Huperzine B ; Acetylcholinesterase inhibitors ; pH-zone refining ; Centrifugal partition chromatography
• 刊名：Journal of Chromatography A
• 出版年：2007
• 出版时间：26 January 2007
• 年：2007
• 卷：1140
• 期：1-2
• 页码：101-106
• 全文大小：527 K

文摘

The pH-zone refining centrifugal partition chromatography technique was used to separate the two acetylcholinesterase inhibitors huperzines A and B from a crude alkaloid extract of the club moss Huperzia serrata. Complete co-elution of huperzines A and B was initially observed with the well-known methyl tert-butyl ether–acetonitrile–water (4:1:5, v/v/v) solvent system with triethylamine (8 mM) as the displacer and methane sulfonic acid (6 mM) as the retainer. An efficient biphasic system was designed on the basis of solvent association that provided selectivity in the elution mode: n-heptane/ethyl acetate/n-propanol/water (5:15:35:45, v/v/v/v). Lowering the bridge solvent content (n-propanol) of this system increased the polarity difference between the two phases thus adapting it to the pH-zone refining mode. Thus, the purification of these compounds was achieved using the biphasic system n-heptane/ethyl acetate/n-propanol/water (10:30:15:45, v/v/v/v) with triethylamine (8 mM) as the displacer and methane sulfonic acid (6 mM) as the retainer.