Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10559542 | Talanta | 2011 | 6 Pages |
Abstract
An ultrathin molecularly imprinted polymer film was anchored on an Au surface for fabricating a surface plasmon resonance sensor sensitive to acephate by a surface-bound photo-radical initiator. The polymerization in the presence of acephate resulted in a molecular-imprinted matrix for the enhanced binding of acephate. Analysis of the SPR wavenumber changes in the presence of different concentrations of acephate gave a calibration curve that included the ultrasensitive detection of acephate by the imprinted sites in the composite, Kass for the association of acephate to the imprinted sites, 7.7Â ÃÂ 1012Â Mâ1. The imprinted ultrathin film revealed impressive selectivity. The selectivity efficiencies for acephate and other structurally related analogues were 1.0 and 0.11-0.37, respectively. Based on a signal to noise ratio of 3, the detection limits were 1.14Â ÃÂ 10â13Â M for apple sample and 4.29Â ÃÂ 10â14Â M for cole sample. The method showed good recoveries and precision for the apple and cole samples spiked with acephate solution. This suggests that a combination of SPR sensing with MIP film is a promising alternative method for the detection of organophosphate compounds.
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Authors
Chuanping Wei, Huiqing Zhou, Jie Zhou,