Magnetic solid phase extraction sorbents using methyl-parathion and quinalphos dual-template imprinted polymers coupled
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ORIGINAL PAPER
Magnetic solid phase extraction sorbents using methyl-parathion and quinalphos dual-template imprinted polymers coupled with GC-MS for class-selective extraction of twelve organophosphorus pesticides Lixia Liu 1,2 & Minli Yang 1 & Muyi He 1 & Tong Liu 1 & Fengming Chen 1 & Yinlong Li 1 & Xuesong Feng 2 & Yuan Zhang 2 & Feng Zhang 1 Received: 5 March 2020 / Accepted: 25 July 2020 # Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract A novel magnetic dual-template molecularly imprinted polymer (DMIP) was prepared with methyl-parathion and quinalphos as templates. For comparison, a series of single-template polymers with only methyl-parathion (MPMIP) or quinalphos (QPMIP) as template as well as a non-imprinted polymer (NIP) in the absence of the template, were synthesized using the same procedure of DMIP. The obtained MIPs were characterized by scanning electron microscopy(SEM), Fourier transform infrared (FT-IR) spectroscopy, vibrating sample magnetometer (VSM), and X-ray diffraction (XRD). The properties including kinetic effect, thermodynamic effect, selectivity, and reusability of MIPs were investigated . Only DMIP possessed high affinity and good recognition for all twelve OPPs including quinalphos, isazophos, chlorpyrifos-methyl, chlorpyrifos, methidathion, triazophos, profenofos, fenthion, fenitrothion, methyl-parathion, parathion, and paraoxon in comparison to MPMIP, QPMIP, or NIP. Moreover, DMIP was used as magnetic solid phase extraction (MSPE) sorbent for the pre-concentration of twelve OPPs in cabbage samples. The developed DMIP-MSPE-GC-MS method showed high sensitivity, low LODs (1.62–13.9 ng/g), fast adsorption equilibrium (10 min), and acceptable spiked recoveries (81.5–113.4%) with relative standard deviations (RSD) in the range 0.05–7.0% (n = 3). The calibration plots were linear in the range 10–800 ng/mL with coefficients of determination (R2) better 0.99 for all twelve compounds. These results suggest that the DMIP is applicable for rapid determination and high throughput analysis of multi-pesticide residues.
Keywords Dual-template . Magnetic molecularly imprinted polymers . Organophosphorus pesticides (OPPs) Abbreviations OPPs Organophosphorus pesticides DMIP Dual-template molecularly imprinted polymer MPMIP Methyl-parathion as template molecularly imprinted polymer
QPMIP
Lixia Liu is the first author while Minli Yang is the co-first author
Introduction
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00604-020-04465-7) contains supplementary material, which is available to authorized users. * Feng Zhang [email protected] 1
Institute of Food Safety, Chinese Academy of Inspection & Quarantine, Beijing, China
2
School of Pharmacy, China Medical University, Shenyang, China
NIP MSPE
Quinalphos as template molecularly imprinted polymer Non-imprinted polymer Magnetic solid phase extraction
Organophosphorus pesticides (OPPs), irreversible acetylcholine esterase enzyme (ACh-E) inhibitor, are commonly used for pest con
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