Immobilized β-Cyclodextrins. Preparation with Various Crosslinking Reagents and the Guest Binding Properties

Abstract

β-Cyclodextrin (β-CyD) was immobilized by crosslinking with 1,2-ethanediol diglycidyl ether, 1,4-buthanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, 1,3-butadiene diepoxide, 1,7-octadiene diepoxide, and epichlorohydrin. The molar ratio of the crosslinking residue to β-CyD (degree of crosslinking) for each macromolecular product was determined by the corresponding elemental analysis. The equilibrium constant K of complex formation of each crosslinking macromolecule for cresols, phenol, nitrophenols, and 2-naphthol was determined, respectively, by the use of electronic absorption spectroscopy in pH 4 and 10 (or 11) buffer solutions. The concept of a hydrophobic enhancement coefficient R was introduced in order to compare the effect of a hydrophobic crosslinking residue upon the complex formation of the immobilized CyD.

Nano‐ and Microsized Cubic Gel Particles from Cyclodextrin Metal–Organic Frameworks

“…The absorption derived from the CÀOÀC stretching vibration (1020-1150 cm À1 ) for the free g-CD was a sharp peak, while that of the immobilized g-CD was broad because of the cross-linking ( Figure S2). [22] Elemental analysis revealed that one unit of CD-MOF was modified with 16.02 molecules of L. These results confirmed that L reacted in the nanopores of the CD-MOF and acted as a cross-linker between the CDs in the CD-MOF. To study the crystallinity of CL-CD-MOF and CGP, we performed XRPD analysis.…”

Polymer‐immobilized cyclodextrin trapping of model organic pollutants in flowing water streams

“…The BCDP was prepared with a modification of Sugiura's procedure 56. Under our optimized conditions, we proceeded as follows.…”

Synthesis and applications of adsorbents containing cyclodextrins

“…The guest binding abilities of these gels towards nitrophenols and 2-naphthol in water were found to be highly dependent on the nature of the crosslinking residues [196,197]. Warner-Schmid et al studied the use of crosslinked polymethylhydrosiloxane pentenyl-b-CD as sorbent to extract aromatic compounds (naphthol, nitrotoluene, nitroacetanilide) from water [198].…”