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Determination of Underivatized Glyphosate Residues in Plant-Derived Food with Low Matrix Effect by Solid Phase Extraction-Liquid Chromatography-Tandem Mass Spectrometry

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Abstract

A method was developed for the determination of glyphosate residues in plant-derived food using a two-step solid phase extraction (SPE) combined with mixed-mode liquid chromatography-tandem mass spectrometry (LC-MS/MS). The samples were extracted with water. Then, the extracting solution was pretreated by a C18 cartridge to remove protein and weak-polar interferences and further directly extracted using a strong anion exchange (SAX) cartridge to remove neutral and basic substances. The obtained glyphosate residues from the SPE were separated on a hydrophilic interaction/weak anion-exchange (HILIC/WAX) column and detected by mass spectrometry with negative electrospray ionization (ESI-) in multiple reaction monitoring (MRM) mode. This approach was evaluated by five different kinds of plant-derived food (soybean, corn, carrot, apple, and spicy cabbage) matrices in terms of matrix effect and recovery. Results showed that two-step SPE and mixed-mode chromatography separation provided the method with a very low matrix effect, and the spiked recoveries of glyphosate were satisfied in the range of 83.1 to 100.8 % at three spiked levels. The limit of quantification (LOQ) and detection (LOD) of the method in different matrices were 0.016–0.026 and 0.005–0.008 mg kg−1, respectively. The procedure was validated and showed good accuracy and precision over a large linear range of 0.02–10 mg kg−1.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (21207130) and the STS program of the Chinese Academy of Sciences (KFT-EW-STS-099).

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Correspondence to Jingyu Yan or Xinmiao Liang.

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Junjie Ding declares that she has no conflict of interest. Gehui Jin declares that he has no conflict of interest. Gaowa Jin declares that she has no conflict of interest. Aijin Shen declare that she has no conflict of interest. Zhimou Guo declares that he has no conflict of interest. Bing Yu declares that he has no conflict of interest. Yang Jiao declares that he has no conflict of interest. Jingyu Yan declares that she has no conflict of interest. Xinmiao Liang declares that he has no conflict of interest.

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This article does not contain any studies with human participants performed by any of the authors.

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Ding, J., Jin, G., Jin, G. et al. Determination of Underivatized Glyphosate Residues in Plant-Derived Food with Low Matrix Effect by Solid Phase Extraction-Liquid Chromatography-Tandem Mass Spectrometry. Food Anal. Methods 9, 2856–2863 (2016). https://doi.org/10.1007/s12161-016-0468-8

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  • DOI: https://doi.org/10.1007/s12161-016-0468-8

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