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Abstract: In this work, we report the synthesis of a mesoporous molecularly imprinted polymer on the surface of silica nanoparticles (core@mMIP) to be applied as adsorbent in microextraction by packed sorbent (MEPS) for selective determination of pesticides in apple juice. The core@mMIP was properly characterized, showing good adhesion of the polymer to the silica core. The best extraction conditions were: 200 μL of ultrapure water as washing solvent, 150 μL of acetonitrile as eluent, 100 μL of sample at pH 2.5, five draw-eject cycles and 8 mg of adsorbent. Thereby, recoveries of 96.12 ± 1.05%, 76.88 ± 6.18% and 76.18 ± 5.57% were obtained for pyriproxyfen (PPX), deltamethrin (DTM) and etofenprox (ETF), respectively. After validation, the method presented linearity in the range of 0.02-10 μg mL-1 (r > 0.99), limit of detection of 0.005 μg mL-1, satisfactory selectivity, and proper precision and accuracy. The method was successfully applied real samples of processed and fresh apple juice
Template and target information: pesticides, pyriproxyfen, PPX, deltamethrin, DTM, etofenprox, ETF
Author keywords: pesticides, Microextraction by packed sorbent, core-shell materials, silica, molecularly imprinted polymer, HPLC