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Detection of Organophosphorus Pesticide Residues in Leaf Lettuce and Cucumber Through Molecularly Imprinted Solid-Phase Extraction Coupled to Gas Chromatography

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Abstract

How to determine multipesticide residues in vegetables is important for the modern society. The development of a simple, rapid, and sensitive method to determine pesticide residues is significant. Our study used common vegetables—leaf lettuce and cucumber, and a new molecularly imprinted polymer (MIP) was synthesized using O,O′-dimethylthiophosphoryl chloride, an intermediate for the manufacture of organophosphorus pesticides, as the template, methacrylic acid as the functional monomer, and ethylene glycol dimethacrylate as the cross-linker. The adsorption capacities of the prepared MIP toward five organophosphorus pesticides (trichlorfon, dichlorvos, dimethoate, imidacloprid, and methamidophos) were evaluated, and its potential as a sorbent for solid-phase extraction was investigated. A novel method for the simultaneous determination of multiple organophosphorus pesticide residues in vegetables was developed by utilizing molecularly imprinted solid-phase extraction (MISPE) coupled with gas chromatography. Under optimal solid-phase extraction conditions, with a flow rate of 3.0 mL/min for loading 100 mL, the enrichment factor was in the range of 36–452 for the five organophosphorus pesticides. The peak area precision of the five organophosphorus pesticides based on five replicates was from 1.59 to 4.07%. The leaf lettuce spiked sample was used to verify the fortified recovery for this method, and the results ranged from 87.48 to 97.85%. The MISPE–gas chromatography method could be used to detect organophosphorus pesticide residues in lettuce leaf and cucumber from the farmer’s market, and the detection limit had no obvious difference from the national standards. This method can meet the requirements of the analysis of pesticides in complex matrix.

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Authors and Affiliations

  1. College of Food Science and Technology, Hainan University, Haikou, 570228, China

    Jian Chen, Wen-ting Zhang, Yang Shu, Xin-hui Ma & Xian-ying Cao

Authors
  1. Jian Chen
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  2. Wen-ting Zhang
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  3. Yang Shu
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  4. Xin-hui Ma
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  5. Xian-ying Cao
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Corresponding author

Correspondence to Xian-ying Cao.

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Funding

This study was funded by “Hainan province production project (grant number CXY20140012)”, “Hainan university social service projects (grant number SHFW201605),” “Hainan province innovation research project of graduate students(Hys2016–47),” and“Hainan University graduate student outstanding paper cultivation plan.”

Conflict of Interest

Jian Chen declares that he has no conflict of interest. Wen-ting Zhang declares that she has no conflict of interest. Yang Shu declares that she has no conflict of interest. Xin-hui Ma declares that he has no conflict of interest. Xian-ying Cao declares that she has no conflict of interest.

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This article does not contain any studies with human or animal subjects.

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Chen, J., Zhang, Wt., Shu, Y. et al. Detection of Organophosphorus Pesticide Residues in Leaf Lettuce and Cucumber Through Molecularly Imprinted Solid-Phase Extraction Coupled to Gas Chromatography. Food Anal. Methods 10, 3452–3461 (2017). https://doi.org/10.1007/s12161-017-0875-5

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  • DOI: https://doi.org/10.1007/s12161-017-0875-5

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