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Hyperoside, 3′- O -methylquercetin 3- O -β- D -galactopyranoside, astragalin and 3′- O -methylquercetin 3- O -β- D -glucopyranoside from an invasive weed  Solanum rostratum  Dunal were separated and purified successfully by high-speed counter-current chromatography (HSCCC) with a solvent system composed of  n -hexane-ethyl acetate–methanol–water (1:7:1:7, v/v) and gradient elution mode preparative high-performance liquid chromatography (prep-HPLC) with low column temperature. In the sample pretreatment section, target compounds in aqueous extract of the weed were concentrated using solvent sublation. Two target fractions with purities of 93.75% and 93.68% were obtained from HSCCC. Their chemical structures were identified. The fraction 1 is a pure compound hyperoside and the fraction 2 is the mixture of astragalin, 3′- O -methylquercetin 3- O -β- D -galactopyranoside and 3′- O -methylquercetin 3- O -β- D -glucopyranoside by nuclear magnetic resonance and liquid chromatography-mass spectra. Then, the three flavonol glycosides in the fraction 2 were separated and purified successfully by prep-HPLC with low column temperature.

journal of chromatographic science

Separation of Four Flavonol Glycosides from  Solanum rostratum  Dunal Using Solvent Sublation Followed by HSCCC and Low Column Temperature Preparative HPLC