Molecules 2011, 16(3), 2551-2560; doi:10.3390/molecules16032551
Communication

LC/MS Guided Isolation of Alkaloids from Lotus Leaves by pH-Zone-Refining Counter-Current Chromatography

Received: 14 February 2011; in revised form: 10 March 2011 / Accepted: 14 March 2011 / Published: 18 March 2011
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: The traditional methods used in natural product separation primarily target the major components and the minor components may thus be lost during the separation procedure. Consequently, it’s necessary to develop efficient methods for the preparative separation and purification of relatively minor bioactive components. In this paper, a LC/MS method was applied to guide the separation of crude extract of lotus (Nelumbo nucifera Gaertn.) leaves whereby a minor component was identified in the LC/MS analysis. Afterwards, an optimized pH-zone-refining CCC method was performed to isolate this product, identified as N-demethylarmepavine. The separation procedure was carried out with a biphasic solvent system composed of hexane-ethyl acetate-methyl alcohol-water (1:6:1:6, v/v) with triethylamine (10 mM) added to the upper organic phase as a retainer and hydrochloric acid (5 mM) to the aqueous mobile phase eluent. Two structurally similar compounds – nuciferine and roemerine – were also obtained from the crude lotus leaves extract. In total 500 mg of crude extract furnished 7.4 mg of N-demethylarmepavine, 45.3 mg of nuciferine and 26.6 mg of roemerine with purities of 90%, 92% and 96%, respectively. Their structures were further identified by HPLC/ESI-MSn, FTICR/MS and the comparison with reference compounds.
Keywords: Nelumbo nucifera Gaertn.; alkaloids; minor component separation; pH-zone-refining counter-current chromatography
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MDPI and ACS Style

Xu, X.; Sun, C.-R.; Dai, X.-J.; Hu, R.-L.; Pan, Y.-J.; Yang, Z.-F. LC/MS Guided Isolation of Alkaloids from Lotus Leaves by pH-Zone-Refining Counter-Current Chromatography. Molecules 2011, 16, 2551-2560.

AMA Style

Xu X, Sun C-R, Dai X-J, Hu R-L, Pan Y-J, Yang Z-F. LC/MS Guided Isolation of Alkaloids from Lotus Leaves by pH-Zone-Refining Counter-Current Chromatography. Molecules. 2011; 16(3):2551-2560.

Chicago/Turabian Style

Xu, Xia; Sun, Cui-Rong; Dai, Xiao-Jing; Hu, Rui-Lin; Pan, Yuan-Jiang; Yang, Zhang-Fa. 2011. "LC/MS Guided Isolation of Alkaloids from Lotus Leaves by pH-Zone-Refining Counter-Current Chromatography." Molecules 16, no. 3: 2551-2560.

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