Flow‐based Technology for Analysis of Food Pesticides

Ruíz-Medina, Antonio; Llorent‐Martínez, Eulogio J.; Córdova, M.L. Fernández-de; Ortega‐Barrales, P.

doi:10.1002/9781118992685.ch17

Cited by 1 publication

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“…One of the main advantages of terbium ions is the possibility to use time‐resolved luminescence . Most interference observed in fluorescence‐based methods arises from other fluorescent compounds that may be present in the samples.…”

Section: Resultsmentioning

confidence: 99%

Determination of thiacloprid, thiamethoxam and imidacloprid in tea samples by quenching terbium luminescence

2019

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Consumption of herbal teas, infusions and other plant-related products has always been popular due to the related health benefits. However, the safety of these products needs to be assessed, for example monitoring the potential presence of contaminants such as pesticides. In this paper, we report an analytical method for determining three neonicotinoid insecticides − thiacloprid, thiamethoxam, and imidacloprid − that are widely used worldwide. This method is based on quenching by analytes of the luminescence signal of terbium ions. Terbium presents a timeresolved luminescence signal at 256/545 nm/nm, which is quenched by the presence of low concentrations of the selected analytes. Detection limits of 0.1, 0.2 or 0.75 μg ml −1 were obtained for thiamethoxam, thiacloprid and imidacloprid, respectively. Recovery experiments in different teas (green tea, black tea, chamomile, peppermint) were performed at concentrations lower than the maximum residue limits established by the European Union and the Codex Alimentarius for tea samples.In all cases, satisfactory recovery yields were observed, and the results were compared with a chromatographic reference method. The proposed method therefore proved suitable for quantifying these insecticides, fulfilling the current legislation.

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Section: Resultsmentioning

confidence: 99%