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Water-soluble β-cyclodextrin-immobilized poly(ethyleneimine) (PEICD) was synthesized by the grafting of β-cyclodextrin to the branched poly(ethyleneimine). In an aqueous solution, this PEICD polymer could encapsulate bisphenol A, known to be a harmful compound. Additionally, the stability constant of bisphenol A to the PEICD polymer was 1.1×10 4 M −1 . However, the water-solubility...