Efficient and selective extraction of azamethiphos and chlorpyrifos residues from mineral water and grape samples using magnetic mesoporous molecularly imprinted polymer.

Roseane Andrade Teixeira, Laíse Aparecida Fonseca Dinali, Hanna Leijoto de Oliveira, Anny Talita Maria da Silva, Keyller Bastos Borges

Food chemistry 2021 Nov 01

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A magnetic mesoporous molecularly imprinted polymers was synthesized on the surface of magnetic nanoparticles silanized with 3-(trimethoxysilyl) propyl methacrylate to introduce reactive methacrylate groups. Subsequently, methacrylic acid monomers were grafted onto the surface of this adsorbent functionalized via polymerization by precipitation. Magnetic mesoporous molecularly imprinted polymer was properly characterized by different techniques and applied as adsorbent in magnetic solid phase extraction for selective determination of two organophosphorus pesticides, azamethiphos and chlorpyrifos, in mineral water and grape samples. After sample preparation optimization, recoveries of 99.56% and 98.86% were obtained for azamethiphos and chlorpyrifos, respectively. The magnetic solid phase extraction coupled to HPLC-UV presented limit of quantification of 5 ng mL-1, linearity ranged of 5 to 1000 ng mL-1, in addition to adequate accuracy, precision and robustness. The pesticides showed stability in the matrix and were satisfactorily quantified in real mineral water and grape samples. Copyright © 2021 Elsevier Ltd. All rights reserved.

Citation

Roseane Andrade Teixeira, Laíse Aparecida Fonseca Dinali, Hanna Leijoto de Oliveira, Anny Talita Maria da Silva, Keyller Bastos Borges. Efficient and selective extraction of azamethiphos and chlorpyrifos residues from mineral water and grape samples using magnetic mesoporous molecularly imprinted polymer. Food chemistry. 2021 Nov 01;361:130116