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- Title
Automated Photochemically Induced Method for the Quantitation of the Neonicotinoid Thiacloprid in Lettuce.
- Authors
Jiménez-López, J.; Llorent-Martínez, E.J.; Martínez-Soliño, S.; Ruiz-Medina, A.
- Abstract
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 (λexc/λem = 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.
- Subjects
EUROPEAN Union; THIACLOPRID; NEONICOTINOIDS; STANDARD deviations; LETTUCE; QUALITY control; LUMINESCENCE; INSECTICIDES
- Publication
Molecules, 2019, Vol 24, Issue 22, p4089
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules24224089