Electrochemical sensors based on biomimetic magnetic molecularly imprinted polymer for selective quantification of methyl green in environmental samples
A new biomimetic sensor was prepared on carbon paste with magnetic molecularly imprinted polymer (mag-MIP)for sensitive and selective detection of methyl green dye. The mag-MIP was synthesized using a functional monomer that was selected before by computational simulation. A mag-NIP (magnetic non-im...
| Autores: | , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2019 |
| País: | Brasil |
| Recursos: | Universidade Estadual Paulista (UNESP) |
| Repositorio: | Repositório Institucional da UNESP |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.unesp.br:11449/189711 |
| Acesso em linha: | http://dx.doi.org/10.1016/j.msec.2019.109825 http://hdl.handle.net/11449/189711 |
| Access Level: | acceso abierto |
| Palavra-chave: | Electrochemical sensor Environmental analysis Magnetic-MIP Methyl green dye |
| Resumo: | A new biomimetic sensor was prepared on carbon paste with magnetic molecularly imprinted polymer (mag-MIP)for sensitive and selective detection of methyl green dye. The mag-MIP was synthesized using a functional monomer that was selected before by computational simulation. A mag-NIP (magnetic non-imprinted polymer)control material was also prepared for comparative purposes. Modeling adsorption studied revealed that the dye-polymer interface followed pseudo-first order kinetics and that maximum adsorption (Qm)of the dye on mag-MIP was 3.13 mg g−1, while the value for mag-NIP was 1.58 mg g−1. The selective material was used as a sensing spot in fabrication of an electrochemical sensor based on modified carbon paste. For electrochemical analysis, the best achievement of the sensor was acquire by tack together a paste with 6.7% (w/w)of mag-MIP and using square-wave adsorptive anodic stripping voltammetry (SWAdASV)in 0.1 mol L−1 phosphate buffer (pH 7.0), with an applied potential (Eappl)of 0.3 V vs. Ag|AgClsat during an adsorption time (Tads)of 120 s. The results were obtained under optimized conditions in which sensor provided a linear concentration range of methyl green from 9.9 × 10−8 to 1.8 × 10−6 mol L−1, with a limit of detection (LOD)of 1.0 × 10−8 mol L−1 and a satisfactory relative standard deviation (RSD)of 4.3% (n = 15). The proposed sensor was applying using two spiked river water samples, obtaining recoveries ranging from 93% to 103%. The proposed method exhibits excellent precision also high reliability and proved to be an alternative method for the quantification of methyl green in real samples. |
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