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).
"Moreover, this device is a widely used sensing device when combined with MIP materials. In the reported studies describing MIP-based QCM sensors     , the advantageous stability and selectivity of MIP materials and the sensitivity of the QCM sensor might combine effectively. However, some challenges have appeared, including the need to enhance the signal response and achieve selective analyte binding, restricting the development and application of MIP-based QCM sensors. "
[Show abstract][Hide abstract] ABSTRACT: This study describes the development of a poly(amidoamine) (PAMAM) dendrimer-based molecularly imprinted biomimetic QCM sensor for methimazole (MMI) determination. This report is the first involving a PAMAM dendrimer as a functional monomer used during the imprinting process to enhance the amount of recognition sites in the polymer matrix to improve the recognition ability. The PAMAM dendrimer (3.0 generation) was first grafted using methacrylic acid (MAA), and the obtained PAMAM-MAA monomer was characterized using FT-IR and NMR spectra. Furthermore, an MMI imprinted material using PAMAM-MAA as a functional monomer was synthesized and modified on the surface of a quartz crystal Au electrode to develop a novel molecularly imprinted biomimetic QCM sensor. Through evaluation over a series of experiments, the QCM sensor exhibited significant selective adsorption, as well as recognition for the template, and provided a highly selective and sensitive strategy for determining the MMI in urine samples. At three spiked concentrations (2.0 mg L−1, 4.0 mg L−1, 8.0 mg L−1) in different urine samples, the recoveries for the measurements ranged from 84.4% to 91.7% with SD of 1.4-6.3% (n = 3), indicating that the prepared sensor has high accuracy and precision for determining MMI in complex biological samples.
Sensors and Actuators B Chemical 02/2015; 207:588-595. DOI:10.1016/j.snb.2014.10.103 · 4.10 Impact Factor
[Show abstract][Hide abstract] 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.
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