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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A new biomimetic sensor based on molecularly imprinted polymers for highly sensitive and selective determination of hexazinone herbicide

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Author(s):
Uria Toro, Maricely Janette [1] ; Marestoni, Luiz Diego [1] ; Taboada Sotomayor, Maria Del Pilar [1]
Total Authors: 3
Affiliation:
[1] State Univ Sao Paulo, UNESP, Inst Chem, Dept Analyt Chem, BR-14801970 Araraquara, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: SENSORS AND ACTUATORS B-CHEMICAL; v. 208, p. 299-306, MAR 1 2015.
Web of Science Citations: 14
Abstract

A new selective sensor based on molecularly imprinted polymers (MIPs) was developed for the determination of hexazinone (HXZ) in environmental samples. MIPs were synthesized using a non-covalent approach, and selection of the monomers employed in the polymerization reaction was carried out by molecular modeling. Three functional monomers with high (2-vinylpyridine (MP17)) and intermediate( methacrylic acid (MP12) and acrylamide (MP5)) energies of binding to the template (HXZ) were selected for preparation of the MIPs, in order to conduct comparative studies and validate the theoretical data. For sensor construction, carbon pastes were modified with each MIP or NIP (non-imprinted polymer), and HXZ determination was performed using differential pulse adsorptive cathodic stripping voltammetry(DPAdCSV). All parameters affecting the sensor response were optimized. In HCl at pH 2.5, the sensor prepared with MP17 (5% w/w in the paste) showed a dynamic linear range between 1.9 x 10(-11)and 1.1 x 10(-10)mol L-1, and a detection limit of 2.6 x 10(-12)mol L-1, under the following conditions: accumulation time of 200 s at a potential of -0.5 V, scan rate of 50 mV s(-1), pulse amplitude of 60 mV, and pulse width of 50 ms. The sensor was selective in the presence of other similar compounds, and was successfully applied to the analysis of HXZ in river water samples. (C) 2014 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 11/12296-6 - Bi-biomimetic systems based on nanoparticles and nanoporous materials to obtain high sensitive and selective methods for determination of pesticides and dyes
Grantee:Maria Del Pilar Taboada Sotomayor
Support type: Regular Research Grants