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Sensors 2018, 18(9), 2965; https://doi.org/10.3390/s18092965

Glyphosate Determination by Coupling an Immuno-Magnetic Assay with Electrochemical Sensors

1
Dipartimento di Chimica, Università degli Studi di Firenze, Via della Lastruccia 3, 50019 Sesto Fiorentino (Fi), Italy
2
Centro de Química-ICUAP, Benemérita Universidad Autónoma de Puebla, 72570 Puebla, Mexico
*
Author to whom correspondence should be addressed.
Received: 20 July 2018 / Revised: 31 August 2018 / Accepted: 1 September 2018 / Published: 6 September 2018
(This article belongs to the Special Issue Immunosensors - 2018 Trends and Perspective)
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Abstract

Glyphosate (N-(phosphonomethyl)glycine) is the most frequently used broad-spectrum herbicide worldwide. Its mechanism of action is based on the inhibition of an enzyme that is essential to plant growth. Its intensive use has caused global contamination to occur, which has not only affected the ecosystems, but even food and other objects of common use. Thus, there is a pronounced need for developing analytical methods for glyphosate determination in different matrices. Here, an electrochemical competitive immunoassay, based on the use of antibody-modified magnetic particles, has been developed. Tetramethylbenzidine (TMB) has been used as an enzymatic substrate. The extent of the affinity reaction has been achieved by monitoring the current value, due to the reduction of the enzymatic product. A disposable screen-printed electrochemical cell has been used. The calibration curve has been recorded in the 0–10,000 ng/L concentration range, with a detection limit of 5 ng/L and quantification limit of 30 ng/L. The electrochemical immunoassay has also been applied to the analysis of spiked beer samples. View Full-Text
Keywords: glyphosate; magnetic beads; electrochemical assay; disposable electrodes; beer glyphosate; magnetic beads; electrochemical assay; disposable electrodes; beer
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Bettazzi, F.; Romero Natale, A.; Torres, E.; Palchetti, I. Glyphosate Determination by Coupling an Immuno-Magnetic Assay with Electrochemical Sensors. Sensors 2018, 18, 2965.

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