Immobilized fluorescent cyclodextrin on a cellulose membrane as a chemosensor for molecule detection

Dansylglycine-modified cyclodextrin (DnsC4-β-CD) was prepared as a fluorescent host that is capable of being immobilized on a cellulose membrane (DnsC4-β-CD membrane). DnsC4-β-CD immobilized on the cellulose membrane decreased its fluorescence intensity with increasing concentration of guest molecules, indicating that the host changes the location of the dansyl group from inside to outside the cyclodextrin cavity upon guest accommodation, which is similar to DnsC4-β-CD in solution, thereby, the DnsC4-β-CD membrane is useful as a novel chemosensor for detecting molecules. This result demonstrates that the cellulose membrane is useful as a practical supporting material for various chromophore-modified cyclodextrins.