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Reference type: Journal
Authors: Díaz-Álvarez M, Turiel E, Martín-Esteban A
Article Title: Molecularly imprinted polymer monolith containing magnetic nanoparticles for the stir-bar sorptive extraction of thiabendazole and carbendazim from orange samples.
Publication date: 2019
Journal: Analytica Chimica Acta
Volume: 1045
Page numbers: 117-122.
DOI: 10.1016/j.aca.2018.09.001
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0003267018310596

Abstract: In this work, a novel molecularly imprinted stir-bar was developed for the stir-bar sorptive extraction (SBSE) of thiabendazole (TBZ) and carbendazim (CBZ) from orange samples. Magnetic nanoparticles were surface modified with oleic acid and then encapsulated by a silica shell using a conventional sol-gel procedure. Subsequently, nanoparticles were functionalized with methacrylate functionalities by grafting onto the particles surface. Finally, the modified magnetic nanoparticles were entrapped in a polymer monolith synthetized by copolymerization with the imprinting polymerization mixture using a glass vial insert as a mold. Variables affecting the polymerization and rebinding conditions of target analytes were optimized. The uptake capacity for the template (TBZ) was evaluated as well as the cross-reactivity for the related compound CBZ by rebinding experiments. Finally, the proposed magnetic imprinted monolith was applied to the SBSE of TBZ and CBZ from orange sample extracts providing a remarkable clean-up ability. The calculated detection limit were 0.13 and 0.10 mg kg-1 for CBZ and TBZ respectively, low enough to satisfactory analysis of both compounds in orange samples according to current European Union regulations
Template and target information: thiabendazole, TBZ, carbendazim, CBZ
Author keywords: molecular imprinting, monolith, magnetic nanoparticles, Stir-bar sorptive extraction, Thiabendazole, Carbendazim, Orange samples

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