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Food Additives & Contaminants: Part A Volume 36, 2019 - Issue 9
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Fast analysis of glufosinate, glyphosate and its main metabolite, aminomethylphosphonic acid, in edible oils, by liquid chromatographycoupled with electrospray tandem mass spectrometry

Marilda ChiarelloResearch Group ‘‘Analytical Chemistry of Contaminants’’, Department of Chemistry and Physics, Research Centre for Mediterranean Intensive Agrosystems and Agri-Food Biotechnology (CIAIMBITAL), University of Almería, Agrifood Campus of International Excellence, ceiA3, Almería, Spain;LBIOP–Laboratory of Biotechnology of Natural and Synthetics Products, Technology Department, Biotechnology Institute, University of Caxais do Sul, Caxais do Sul, BrazilORCID Iconhttps://orcid.org/0000-0002-3999-4052View further author information
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María Luisa Jiménez-MedinaResearch Group ‘‘Analytical Chemistry of Contaminants’’, Department of Chemistry and Physics, Research Centre for Mediterranean Intensive Agrosystems and Agri-Food Biotechnology (CIAIMBITAL), University of Almería, Agrifood Campus of International Excellence, ceiA3, Almería, SpainORCID Iconhttps://orcid.org/0000-0003-2175-7769View further author information
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Jesús Marín SaézResearch Group ‘‘Analytical Chemistry of Contaminants’’, Department of Chemistry and Physics, Research Centre for Mediterranean Intensive Agrosystems and Agri-Food Biotechnology (CIAIMBITAL), University of Almería, Agrifood Campus of International Excellence, ceiA3, Almería, SpainORCID Iconhttps://orcid.org/0000-0002-4153-9788View further author information
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Sidnei MouraLBIOP–Laboratory of Biotechnology of Natural and Synthetics Products, Technology Department, Biotechnology Institute, University of Caxais do Sul, Caxais do Sul, BrazilORCID Iconhttps://orcid.org/0000-0003-1903-6735View further author information
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Antonia Garrido FrenichResearch Group ‘‘Analytical Chemistry of Contaminants’’, Department of Chemistry and Physics, Research Centre for Mediterranean Intensive Agrosystems and Agri-Food Biotechnology (CIAIMBITAL), University of Almería, Agrifood Campus of International Excellence, ceiA3, Almería, SpainORCID Iconhttps://orcid.org/0000-0002-7904-7842View further author information
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Roberto Romero-GonzálezResearch Group ‘‘Analytical Chemistry of Contaminants’’, Department of Chemistry and Physics, Research Centre for Mediterranean Intensive Agrosystems and Agri-Food Biotechnology (CIAIMBITAL), University of Almería, Agrifood Campus of International Excellence, ceiA3, Almería, SpainCorrespondence[email protected]
ORCID Iconhttps://orcid.org/0000-0002-2505-2056View further author information
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Pages 1376-1384 | Received 04 Apr 2019, Accepted 05 Jun 2019, Published online: 09 Jul 2019
 
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ABSTRACT

A method has been developed for the rapid, specific, accurate, precise and sensitive determination of glufosinate, glyphosate and its major metabolite, aminomethylphosphonic acid, in edible oils, by liquid chromatography coupled to tandem mass spectrometry. Oils were extracted with acidified water (1% formic acid), and the extracts were directly injected into an LC using a Hypercarb column as the stationary phase. The analytes were eluted by a mobile phase of methanol and water containing 1% acetic acid, and they were ionised by electrospray ionisation in negative ion mode. The method was validated and limits of quantification ranged from 5 μg kg−1 (aminomethylphosphonic acid) to 10 μg kg−1 (glyphosate and glufosinate). Three concentrations (10, 50 and 100 μg kg−1) were selected to perform recovery studies. Mean recoveries ranged from 81.4% to 119.4%. Intra and inter-day precision were lower than 19%. Different edible oils were analysed, and no residues of the studied herbicides were detected above limits of quantification.

Graphical Abstract

Acknowledgments

The authors gratefully acknowledge to the Spanish Ministry of Science, Innovation and Universities and FEDER (project ref. RTC-2017-6170-2) for financial support. MC gratefully acknowledges CAPES (Coordination for the Improvement of Higher Level Personnel), Foundation within the Ministry of Education, Brazil for financial support for her stay at Almeria University.

Conflict of interest

Authors declare that they have no conflict of interest.

Additional information

Funding

This work was supported by the Coordination for the Improvement of Higher Level Personnel, Foundation within the Ministry of Education, Brazil [0000];Spanish Ministry of Science, Innovation and Universities [RTC-2017-6170-2].

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