Synthesis and properties of water-insoluble β-cyclodextrin polymer crosslinked by citric acid with PEG-400 as modifier

Water-insoluble beta-cyclodextrin polymer (beta-CDP) crosslinked by citric acid was synthesized with Polyethylene glycol 400 (PEG-400) as modifier through an environment friendly procedure. The yield of beta-CDP was related to the amounts of citric acid, PEG-400 and catalyst in the formulation. beta-CD content and total acidic groups of the produced beta-CDP were also found to be related to the formulation. FT-IR spectra disclosed that the hydroxyl groups of beta-CD had crosslinked with the carboxyl groups of citric acid, and at the same time the structure characteristics of beta-CD were well maintained in the polymer. Preliminary study on adsorption toward aniline disclosed that beta-CDP which had a larger amount of total acidic groups generally had a larger adsorption capacity towards aniline. (C) 2009 Elsevier Ltd. All rights reserved.