Solid-state NMR characterization of cyclomaltoheptaose (beta-cyclodextrin)polymers using high-resolution magic angle spinning with gradients

Solid-state nuclear magnetic resonance (NMR) techniques were used to charac terize cyclomaltoheptaose (beta-cyclodextrin, beta-CD) polymers. These inso luble materials have been investigated by cross-polarization magic angle sp inning with dipolar decoupling (CP/MAS), magic angle spinning without dipol ar decoupling (MAS), and high-resolution magic angle spinning with gradient s (HRMAS). These NMR spectra allow the assignment of the principal H-1 and C-13 signals. The presence of two distinct components (cross-linked beta-CD and polymerized epichlorohydrin) in the materials was clearly demonstrated . These polymers were used as sorbents and the resulting NMR spectra are pr esented and discussed. (C) 2000 John Wiley & Sons, Inc.