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Non-covalent and semi-covalent molecularly imprinted polymers for selective on-line solid-phase extraction of
Ester Caro1, Nuria Masqué, Rosa M Marcé
1Department de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, Tarragona, Spain.
Abstract:
Two molecularly imprinted polymers (MIPs) have been synthesised for the selective extraction of 4-nitrophenol (4-NP) from water samples. One polymer was synthesised via a non-covalent approach and the other via a semi-covalent approach. The selectivity of the polymers for 4-NP was evaluated when these polymers were applied in on-line solid-phase extraction (MISPE) coupled to reversed-phase HPLC. The MISPE conditions for both MIPs were optimised and a clean-up step was included to eliminate non-specific interactions. Differences between the two MIPs were observed with the non-covalent MIP being the more selective of the two, whereas the recoveries were slightly higher for the semi-covalent MIP. The performance of the imprinted polymers in the MISPE of real water samples was also evaluated.