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Herein we describe the development of a homogeneous assay for the detection of 4-nitroaniline (4-NA) and 2, 4-dinitroaniline (2, 4-diNA). This assay relies on fluorescent molecularly imprinted nanoparticles (nanoMIPs) which, upon interaction with the target analytes, generate a reduction in fluorescence emission intensity (quenching). This is due to a responsive fluorescent monomer (N-2-propenyl-(5-dimethylamino)-1-naphthalene sulphonamide) employed in the manufacture of the nanoMIPs which, by virtue of the imprinting process, is capable of selective interaction with the target analyte, thus giving rise to a quenching effect. Selectivity experiments showed excellent recognition properties toward the target molecule. Under optimal conditions, the fluorescence intensity of these nanoMIPs decreased as the concentration of the imprinted analyte increased from 10 nM to 2.71 μM. A linear relation between the negative logarithm of 4-NA or 2, 4-diNA concentrations and the fluorescence intensity for both nanosystems was found (R2 = 0.991 and R2 = 0.9895), with excellent sensitivity (limit of detection (LOD) = 7 and 6 nM, respectively). Furthermore, both nanosystems have been successfully applied for detection of 4-NA or 2, 4-diNA in tap water, with recoveries between 90% to 100.6% and 92% to 100.3%, respectively. Thanks to the versatility of the imprinting process, this nanosystem holds the potential for further development of several optical sensors for many other compounds.
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