Parathion Sensor Based on Molecularly Imprinted Sol-Gel Films.


Marx S, Zaltsman A, Turyan I, Mandler D. Parathion Sensor Based on Molecularly Imprinted Sol-Gel Films. Anal. Chem.Analytical Chemistry. 2004;76 (1) :120 - 126.

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Thin films of a molecularly imprinted sol-gel polymer with specific binding sites for parathion were developed. The films were cast on glass substrates and on glassy carbon electrodes and were used to detect parathion in aq. solns. Gas-phase binding measurements were performed on coated quartz crystal microbalance resonators. The binding of parathion to the imprinted films in the liq. phase was investigated by steady-state expts. with anal. by GC-FPD and cyclic voltammetry. The imprinted films showed high selectivity toward parathion in comparison to similar organophosphates. The binding was very sensitive to the type of functional monomer used for imprinting, and that rational design of the matrix components is an essential step in mol. imprinting. Specific binding in the gas phase proved to be less sensitive to the imprinting effect and exhibits relatively high nonspecific binding. The difference between mol. recognition in the gas- and liq.-phase imprinted polymer is discussed. [on SciFinder(R)]


CAPLUS AN 2003:935964(Journal)