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Open AccessArticle

Automated Photochemically Induced Method for the Quantitation of the Neonicotinoid Thiacloprid in Lettuce

Department of Physical and Analytical Chemistry, Faculty of Experimental Sciences, University of Jaén, Campus Las Lagunillas, E-23071 Jaén, Spain
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Molecules 2019, 24(22), 4089; https://doi.org/10.3390/molecules24224089
Received: 11 September 2019 / Revised: 4 November 2019 / Accepted: 6 November 2019 / Published: 12 November 2019
(This article belongs to the Special Issue Modern Flow Analysis)
In this work, we present an automated luminescence sensor for the quantitation of the insecticide thiacloprid, one of the main neonicotinoids, in lettuce samples. A simple and automated manifold was constructed, using multicommutated solenoid valves to handle all solutions. The analyte was online irradiated with UV light to produce a highly fluorescent photoproduct (λexcem = 305/370 nm/nm) that was then retained on a solid support placed in the flow cell. In this way, the pre-concentration of the photoproduct was achieved in the detection area, increasing the sensitivity of the analytical method. A method-detection limit of 0.24 mg kg−1 was achieved in real samples, fulfilling the Maximum Residue Limit (MRL) of The European Union for thiacloprid in lettuce (1 mg kg−1). A sample throughput of eight samples per hour was obtained. Recovery experiments were carried out at values close to the MRL, obtaining recovery yields close to 100% and relative standard deviations lower than 5%. Hence, this method would be suitable for routine analyses in quality control, as an alternative to other existing methods. View Full-Text
Keywords: neonicotinoid; thiacloprid; solid-phase spectroscopy; optosensor; luminescence neonicotinoid; thiacloprid; solid-phase spectroscopy; optosensor; luminescence
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MDPI and ACS Style

Jiménez-López, J.; Llorent-Martínez, E.J.; Martínez-Soliño, S.; Ruiz-Medina, A. Automated Photochemically Induced Method for the Quantitation of the Neonicotinoid Thiacloprid in Lettuce. Molecules 2019, 24, 4089. https://doi.org/10.3390/molecules24224089

AMA Style

Jiménez-López J, Llorent-Martínez EJ, Martínez-Soliño S, Ruiz-Medina A. Automated Photochemically Induced Method for the Quantitation of the Neonicotinoid Thiacloprid in Lettuce. Molecules. 2019; 24(22):4089. https://doi.org/10.3390/molecules24224089

Chicago/Turabian Style

Jiménez-López, J.; Llorent-Martínez, E.J.; Martínez-Soliño, S.; Ruiz-Medina, A. 2019. "Automated Photochemically Induced Method for the Quantitation of the Neonicotinoid Thiacloprid in Lettuce" Molecules 24, no. 22: 4089. https://doi.org/10.3390/molecules24224089

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