Review of the existing maximum residue levels for lufenuron according to Article 12 of Regulation (EC) No 396/2005

Development, validation, and application of a multi-method for the determination of mycotoxins, plant growth regulators, tropane alkaloids, and pesticides in cereals by two-dimensional liquid chromatography tandem mass spectrometry

Mycotoxins and pesticides regularly co-occur in agricultural products worldwide. Thus, humans can be exposed to both toxic contaminants and pesticides simultaneously, and multi-methods assessing the occurrence of various food contaminants and residues in a single method are necessary. A two-dimensional high performance liquid chromatography tandem mass spectrometry method for the analysis of 40 (modified) mycotoxins, two plant growth regulators, two tropane alkaloids, and 334 pesticides in cereals was developed. After an acetonitrile/water/formic acid (79:20:1, v/v/v) multi-analyte extraction procedure, extracts were injected into the two-dimensional setup, and an online clean-up was performed. The method was validated according to Commission Decision (EC) no. 657/2002 and document N° SANTE/12682/2019. Good linearity (R2 > 0.96), recovery data between 70-120%, repeatability and reproducibility values < 20%, and expanded measurement uncertainties < 50% were obtained for a wide range of analytes, including very polar substances like deoxynivalenol-3-glucoside and methamidophos. However, results for fumonisins, zearalenone-14,16-disulfate, acid-labile pesticides, and carbamates were unsatisfying. Limits of quantification meeting maximum (residue) limits were achieved for most analytes. Matrix effects varied highly (-85 to +1574%) and were mainly observed for analytes eluting in the first dimension and early-eluting analytes in the second dimension. The application of the method demonstrated the co-occurrence of different types of cereals with 28 toxins and pesticides. Overall, 86% of the samples showed positive findings with at least one mycotoxin, plant growth regulator, or pesticide.

Lufenuron induces reproductive toxicity and genotoxic effects in pregnant albino rats and their fetuses

Insecticides and other agrochemicals have become indispensable components of the agricultural system to ensure a notable increase in crop yield and food production. As a natural consequence, chemical residues result in significantly increased contamination of both terrestrial and aquatic ecosystems. The present study evaluated the teratogenic, genotoxic, and oxidative stress effects of residual-level lufenuron exposure on pregnant rats during the organogenesis gestational period of both mother and fetus. The tested dams were divided into three groups; control (untreated), low-dose group (orally administered with 0.4 mg/kg lufenuron) and high-dose group (orally administered with 0.8 mg/kg lufenuron). The dams of the two treatment groups showed teratogenic abnormalities represented by the asymmetrical distribution of fetuses in both uterine horns, accompanied by observed resorption sites and intensive bleeding in the uterine horns, whereas their fetuses suffered from growth retardation, morphologic malformations, and skeletal deformations. Histologic examination of the liver and kidney tissues obtained from mothers and fetuses after lufenuron exposure revealed multiple histopathologic changes. DNA fragmentation and cell cycle perturbation were also detected in the liver cells of lufenuron-treated pregnant dams and their fetuses through comet assay and flow cytometry, respectively. Moreover, lufenuron-induced oxidative stress in the liver of mothers and fetuses was confirmed by the increased malondialdehyde levels and decreased levels of enzymatic antioxidants (glutathione peroxidase and superoxide dismutase). Taken together, it can be concluded that lufenuron has a great potential in exerting teratogenic, genotoxic, and oxidative stresses on pregnant rats and their fetuses upon chronic exposure to residual levels during the organogenesis gestational period. The obtained results in the present study imply that women and their fetuses may have the same risk.

Setting of import tolerances for lufenuron in various commodities of plant and animal origin

In accordance with Article 6 of Regulation (EC) No 396/2005, the applicant Syngenta Crop Protection AG submitted a request to the competent national authority in Portugal to set import tolerances for the active substance lufenuron in grapefruits, oranges, limes, pome fruits, peppers, coffee, sugar canes, muscle, fat, liver and kidney on the basis of the authorised uses of lufenuron in Brazil, Chile and Morocco. The data submitted in support of the request were found to be sufficient to derive maximum residue level (MRL) proposals for all commodities under assessment. For oranges, limes, pome fruits, peppers and coffee beans and commodities of animal origin, the submitted data indicated no need to modify the existing EU MRLs. For grapefruits and sugar cane, the residue data indicated that higher MRLs would be needed. Adequate analytical methods for enforcement are available to control the residues of lufenuron in plant and animal matrices. Based on the risk assessment results, EFSA concluded that the existing EU uses and the authorised uses of lufenuron in Brazil, Chile and Morocco will not result in chronic consumer exposure exceeding the toxicological reference value. Considering, however, that the estimated exposure is close to the acceptable daily intake (ADI) and in the light of the expiry of the approval of the active substance, EFSA recommends the review of the existing MRLs taking into account that the MRLs based on the EU uses will become obsolete.

The 2018 European Union report on pesticide residues in food

Under EU legislation (Article 32, Regulation (EC) No 396/2005), EFSA provides an annual report which analyses pesticide residue levels in foods on the European market. The analysis is based on data from the official national control activities carried out by EU Member States, Iceland and Norway and includes a subset of data from the EU-coordinated control programme which uses a randomised sampling strategy. For 2018, 95.5% of the overall 91,015 samples analysed fell below the maximum residue level (MRL), 4.5% exceeded this level, of which 2.7% were non-compliant, i.e. samples exceeding the MRL after taking into account the measurement uncertainty. For the subset of 11,679 samples analysed as part of the EU-coordinated control programme, 1.4% exceeded the MRL and 0.9% were non-compliant. Table grapes and sweet peppers/bell peppers were among the food products that most frequently exceeded the MRLs. To assess acute and chronic risk to consumer health, dietary exposure to pesticide residues was estimated and compared with health-based guidance values. The findings suggest that the assessed levels for the food commodities analysed are unlikely to pose concern for consumer health. However, a number of recommendations are proposed to increase the efficiency of European control systems (e.g. optimising traceability), thereby continuing to ensure a high level of consumer protection.