Piezoelectric atrazine sensor based on a molecularly imprinted film of titanium dioxide
ABSTRACT We have developed a piezoelectric sensor for the determination of atrazine. It is based on the modification of a molecularly
imprinted film of TiO2 that was placed on a quartz crystal via a surface sol–gel process. The resulting sensor exhibits high selectivity for atrazine,
a re-usability that is better than that of other sensors, a response time of 3min, a wider linear range (0.0005–8mM), and
a lower detection limit (0.1μM). The analytical application of the atrazine sensor confirms the feasibility of atrazine determination.
Graphical abstractThe response of QCM electrodes prepared by various methods to atrazine (pH 5.0).
KeywordsAtrazine–Quartz crystal microbalance (QCM)–Molecularly imprinted TiO2 film–Atrazine sensor–Determination
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ABSTRACT: A new voltammetric competitive immunosensor selective for atrazine, based on the immobilization of a conjugate atrazine-bovine serum albumine on a nanostructured gold substrate previously functionalized with poliamidoaminic dendrimers, was realized, characterized, and validated in different real samples of environmental and food concern. Response of the sensor was reliable, highly selective and suitable for the detection and quantification of atrazine at trace levels in complex matrices such as territorial waters, corn-cultivated soils, corn-containing poultry and bovine feeds and corn flakes for human use. Selectivity studies were focused on desethylatrazine, the principal metabolite generated by long-term microbiological degradation of atrazine, terbutylazine-2-hydroxy and simazine as potential interferents. The response of the developed immunosensor for atrazine was explored over the 10(-2)-10(3)ngmL(-1) range. Good sensitivity was proved, as limit of detection and limit of quantitation of 1.2 and 5ngmL(-1), respectively, were estimated for atrazine. RSD values <5% over the entire explored range attested a good precision of the device.Analytica chimica acta 01/2014; 806C:197-203. DOI:10.1016/j.aca.2013.11.002