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

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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 (α, β) -monochelate and (α, β) (α, β) -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 (α, β) (α, γ) -bischelate complex was revealed in addition to (α, β) -monochelate, (α, β) (α, β) -bischelate and (α, γ) -monochelate complexes similarly to the borate-dextran system. Formation constants of borate complexes with Cellulofine GCL and Sephadex G are reported.

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