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Polyaminocyclodextrin nanosponges: synthesis, characterization and pH-responsive sequestration abilities

  • Authors: Russo, M.; Saladino, M.; Chillura Martino, D.; Lo Meo, P.; Noto, R.
  • Publication year: 2016
  • Type: Articolo in rivista (Articolo in rivista)
  • OA Link:


New pH-responsive nanosponges were obtained by reacting four different polyaminocyclodextrins with heptakis-(6-bromo)-(6-deoxy)-╬▓-cyclodextrin. The materials obtained were characterized by various techniques (FT-IR, potentiometric titration, differential scanning calorimetry (DSC), porosimetry (BET), 13C{1H} CP-MAS NMR). Their adsorption abilities at different pH values were verified towards a suitable set of model guests, and seem mainly controlled by electrostatic interactions, as a function of the protonation/charge status of the polymer matrix. By contrast, data positively point out a lesser importance assumed by the induced-fit effect, important in affecting the formation of host-guest complexes in solution. The frequency-switched Lee-Goldburg (FSLG) heteronuclear correlation solid-state NMR technique was exploited in order to assess the possible location of the guests within the polymer matrix.