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Boron species adsorbed onto polysaccharide gels, cellulose (Cellulofme GC), cellulose cross-linked with epichlorohydrin (Cellulofme GCL) and dextran cross-linked with epichlarohydrin (Sephadex G), were characterized by 11B NMR spectroscopy. Borate ion reacts with Cellulofine GCL-25 to form both (ƒ¿,ƒÀ)-monochelate and (ƒ¿,ƒÀ)(ƒ¿,ƒÀ)-bischelate complexes. In the case of Cellulofine GC-100, however, hydrogen bonds among the cellulose chains to hold the gel structure prevent the completion with borate. For Sephadex G-25 the formation of (ƒ¿,ƒÀ)(ƒ¿,ƒÁ)-bischelate complex was revealed in addition to (ƒ¿,ƒÀ)-monochelate, (ƒ¿,ƒÀ)(ƒ¿,ƒÀ)-bischelate -and (ƒ¿,ƒÁ)-monochelate complexes similarly to the borate-dextran system. Formation constants of borate complexes with Cellulofine GCL and Sephadex G are reported.

Speciation of Boron Species Adsorbed onto Polysaccharide Gel by 11B NMR Spectroscopy