On-chip definition of picolitre sample injection plugs for miniaturised liquid chromatography |
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Authors: | O'Neill A P O'Brien P Alderman J Hoffman D McEnery M Murrihy J Glennon J D |
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Institution: | Instituto de Química, UNESP, Araraquara, SP, Brazil. |
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Abstract: | High-speed counter-current chromatography was applied to the preparative separation and purification of naphthopyranone glycosides from a crude 70% ethanolic extract of the capitula of Paepalanthus microphyllus. The solvent system used was composed of water-ethanol-ethyl acetate-hexane (10:4:10:4, v/v). This technique led to the separation of four different naphthopyranone glycosides in pure form in only 7 h. |
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