Preparation of polyelectrolyte-layered assemblies containing cyclodextrin and their binding properties

Katsuhiko Sato, Iwao Suzuki, Jun Ichi Anzai

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

Polyelectrolyte-layered films containing α- and β-cyclodextrin were prepared by a layer-by-layer deposition of sulfonated α- or β-cyclodextrin (s-α-CyD or s-β-CyD) and cationic poly(allylamine hydrochloride) (PAH) on a solid surface. The deposition of the films from water solutions (no salt added) afforded thin films in which s-α-CyD and s-β-CyD formed roughly a monomolecular layer upon each deposition, while the films were thicker when a high-ionic-strength buffer was employed as a bathing solution. The PAH-s-α-CyD film bound methyl orange (MO) by forming an inclusion complex in the film, whereas MO did not form the complex with s-β-CyD in the PAH-s-β-CyD film but formed aggregates on the surface of the film. MO was not desorbed from the films upon rinsing in pure water or even in a HCl solution (pH 2), whereas MO was extracted from the film into a NaOH solution (pH 12). MO complexed with s-α-CyD in the film was protected from protonation in HCl solution (pH 2). The PAH-s-α-CyD film showed a binding selectivity to azoaromatic dyes depending on the size and shape of the dyes.

Original languageEnglish
Pages (from-to)7406-7412
Number of pages7
JournalLangmuir
Volume19
Issue number18
DOIs
Publication statusPublished - 2003 Sep 2

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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