Determination of the Neonicotinoid Thiacloprid in Vegetables by Using Photochemically Induced Fluorescence | Chapter 11 | Current Topics on Chemistry and Biochemistry Vol. 1

 The insecticide thiacloprid, one of the most frequent neonicotinoids, is measured in lettuce samples using an automated luminescence sensor described in this work. In the last decade, the application of luminescence sensors has increased, reducing reagent waste and enhancing automation. A simple and automated manifold using multicommutated solenoid valves was created to handle all solutions. The analyte was exposed to UV light on-line, resulting in a highly fluorescent photoproduct (exc/em = 305/370 nm/nm) that was subsequently held on a solid support in the flow-cell. In genuine samples, a technique detection limit of 0.24 mg kg-1 was attained, meeting the European Union's Maximum Residue Limit (MRL) for thiacloprid in lettuce (1 mg kg-1). It was feasible to obtain an 8-sample-per-hour sampling throughput. Recovery yields of close to 100% and relative standard deviations of less than 5% were achieved in studies done at levels close to the MRL. As a result, this method might be utilised for routine quality control evaluations as an alternative to other existing approaches.

Author(S) Details

Antonio Ruiz-Medina
Department of Physical and Analytical Chemistry, Faculty of Experimental Sciences, University of Jaén, Campus Las Lagunillas, E-23071 Jaén, Spain.

Julia Jiménez-López
Department of Physical and Analytical Chemistry, Faculty of Experimental Sciences, University of Jaén, Campus Las Lagunillas, E-23071 Jaén, Spain.

Euologio J. Llorent-Martínez
Department of Physical and Analytical Chemistry, Faculty of Experimental Sciences, University of Jaén, Campus Las Lagunillas, E-23071 Jaén, Spain.

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