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Abstract: In this work, novel molecularly imprinted stir-bars based upon the entrapment of modified magnetic nanoparticles within an imprinted polymer monolith is developed for stir-bar sorptive extraction (SBSE). Firstly, magnetic nanoparticles were surface modified with oleic acid followed by encapsulation inside a silica network. Then, vinyl-groups were grafted onto the particles surface for the subsequent copolymerization with the imprinting polymerization mixture using a glass vial insert as a mold. As a result, the obtained imprinted monolith presented magnetic properties allowing its use as magnetic stir-bar. Variables affecting both polymer morphology (i.e., amount of magnetic nanoparticles, polymerization time) and binding-elution conditions of target analytes (i.e., solvents, time) was carefully optimized. Optimum imprinted stir-bars were evaluated for the SBSE of triazines in soil sample extracts. Recoveries, at 16 ng g-1 concentration level, ranged from 2.4 to 8.7% with relative standard deviations lower than 15% (n = 3). Although low recoveries were obtained, the high selectivity provided by the new molecularly imprinted stir-bars allowed reaching detection limits below 7.5 ng g-1 by liquid chromatography coupled to UV detection
Template and target information: propazine, PPZ, triazines, desethylatrazine, DEA, desisopropylatrazine, DIA, simazine, SIM, cyanazine, CYA, atrazine, ATR, terbutylazine, TER
Author keywords: molecular imprinting, monolith, magnetic nanoparticles, Stir-bar sorptive extraction, triazines, Soils