Synthesis of the adsorbent based on macroporous copolymer MA-DVB beads andits application in purification for the extracts from Ginkgo biloba leaves

The macroporous polymethacrylate beads were synthesized via suspension poly merization of methacrylate and divinylbenzene as crosslinker. Thus, a kind of adsorbent with high selectivity for ginkgo flavonol glycosides and terpe ne lactones was obtained. The relationship between the structure of the ads orbents and their adsorption properties was investigated in derail. The res ults show that the adsorbent with appropriate surface chemistries would be favorable to the adsorption for flavonol glycosides and terpene lactones, w hile relative smooth surface takes an important role in selectively adsorbi ng ginkgolides. Extracts of ginkgo leaves with more than 30% w/w flavonol g lycoside and 8% w/w terpene lactones were prepared by using this kind of ad sorbent as purification material. (C) 2000 Elsevier Science B.V. All rights reserved.