Molecularly imprinted polymers from nicotinamide and its positional isomers

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Abstract
Imprinted polymers were prepared for nicotinamide and its positional isomers. The influence of porogenic solvent and functional monomer on recognition properties of the polymer was compared. The results indicated that two functional groups, the heterocyclic nitrogen and the amide group, in the nicotinamide or isonicotinamide molecule have a synergistic effect in binding to the polymer. The polymers prepared with nicotinamide and isonicotinamide can be used as HPLC stationary phase for the separation of positional isomers of nicotinamide or isonicotinamide, while the polymer prepared with picolinamide showed no specificity toward the template. The mechanisms for the differences in recognition are discussed. In addition to the retention of polymers to their templates the polymers also displayed excellent retention to nicotinic acid and isonicotinic acid, compounds structurally similar to the template. This dual recognition property of the polymer may be useful in circumstances where the preparation of a polymer for a specific template may be problematic because of poor stability or solubility. Copyright © 2001 John Wiley & Sons, Ltd. Abbreviations used: AIBN 2,2′-azo-bis-iso-butyronitrile EGDMA ethylene glycol dimethacrylate HPLC high performance liquid chromatography MAA methacrylic acid MIPs molecular imprinted polymers NAM nicotinamide.