화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.16, No.5, 763-766, September, 2010
pH-Dependent release of blue dextran from carboxymethyl-β-cyclodextrin hydrogels
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Carboxymethyl-β-cyclodextrin (CM-β-CD) hydrogel was prepared by cross-linking β-CD and substituting the hydroxyl groups with carboxymethyl group. Epichlorohydrin (EPI) was used as a cross-linker and the molar ratio of EPI to β-CD was 10:1. The number of carboxymethyl group per β-CD residue was determined by a back-titration method and the value was 0.86. The swelling ratio of CM-β-CD hydrogel increased as the pH of medium increased. The carboxyl group will be ionized with increasing pH and an electrostatic repulsion developed within the hydrogels would be responsible for a higher swelling ratio at a higher pH. The degree of release of blue dextran from the hydrogel also increased as the pH of medium increased. The pH-dependent swelling ratio could account for the pHsensitive release.
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