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A Novel Rhein-Functionalized Resin with Application for the Preconcentration of Anthraquinones

Anthraquinones are active components of herbal medicine, and consequently it is necessary to develop a selective, convenient, and green preconcentration method for these compounds. A rhein-functionalized resin was synthesized by a condensation reaction followed by characterization by infrared spectroscopy, transmission electron microscopy, solid carbon-13 nuclear magnetic resonance, and elemental analysis. The rhein-functionalized resin was employed for solid-phase extraction with HPLC-MS for the determination of anthraquinones in the extracts of Polygonum cuspidatum. Emodin, chrysophanol, and physcion were selectively concentrated by a simple absorption and desorption procedure. The results indicated that this new material has application for separating and enriching anthraquinones from herbal medicine, which is significant for pharmaceutical analysis.