Solid-state 113Cd NMR studies of metal-binding to a Datura innoxia biomaterial

Abstract

The use of both slurry and solid-state 113Cd NMR has been applied to the investigation of the chemical moieties involved in cadmium ion binding to a biosorbent. This material was derived from fragments of cell walls cultured from the plant Datura innoxia. Comparison of the −14-ppm chemical shift of the bound metal ion with that of model ligands directly demonstrated the involvement of carboxylate-containing binding sites. The application of solid-state cross-polarization magic angle spinning techniques to the metal-bound material yielded a broad resonance. This was interpreted as indicative of the presence of a distribution of chemically similar sites.