Ensuring Safe Insecticide Levels in Broccoli Using Advanced Testing Methods
Image Source: Natural Science News, 2024
Key Findings
- The study, conducted in India, assessed the safety of three insecticides—cyantraniliprole, flubendiamide, and acetamiprid—in broccoli
- The QuEChERS method was validated and found reliable for estimating insecticide residues in broccoli and soil
- Initial insecticide deposits in broccoli halved within 1.9 to 2.5 days, and no residues were detected in the soil at harvest time
- Proposed maximum residue limits (MRLs) for the insecticides were calculated, showing no significant dietary risk to the Indian population from consuming treated broccoli
The study conducted by Dr. YS Parmar University of Horticulture and Forestry focused on the residue behavior and dietary risk assessment of three insecticides—cyantraniliprole, flubendiamide, and acetamiprid—in broccoli using the QuEChERS technique coupled with LC-MS/MS[1]. This research is crucial as it addresses the safety and regulatory guidelines concerning pesticide residues in food crops, particularly broccoli, which is widely consumed.
The QuEChERS method, known for being quick, easy, cheap, effective, rugged, and safe, was employed and validated based on various parameters such as linearity, accuracy, precision, robustness, matrix effects, limit of quantification (LOQ), specificity, retention time, and ion ratio. These parameters were evaluated in accordance with SANTE (Directorate General for Health and Food Safety) guidelines to ensure the method's reliability in estimating insecticide residues in broccoli and the surrounding soil.
The study found that the LOQ for all three insecticides was 0.01 mg/kg. The initial deposits of cyantraniliprole, flubendiamide, and acetamiprid diminished to half their concentration within approximately 1.9 to 2.5 days. Importantly, no residues were detected in the broccoli-cropped soil at harvest time, which was 30 days after the last pesticide application.
The proposed maximum residue limits (MRLs) for cyantraniliprole, flubendiamide, and acetamiprid were calculated to be 1.5, 0.5-0.9, and 2.0-3 mg/kg, respectively, using the Organisation for Economic Co-operation and Development (OECD) MRL calculator. The acute and chronic dietary risk assessments indicated that there is no significant dietary risk to the Indian population from consuming broccoli treated with these insecticides.
This study builds on previous research that examined pesticide residues in various vegetables. For example, a study on the residues of four insecticides in lettuce, cabbage, Chinese cabbage, and broccoli found that pesticide residues often exceeded the maximum residue limits (MRLs)[2]. This earlier research highlighted the variability in pesticide deposits among different crops and the potential health risks associated with consuming vegetables with high pesticide residues. The current study, however, offers a more refined approach to assessing these risks by focusing on the specific behavior of cyantraniliprole, flubendiamide, and acetamiprid in broccoli and using the QuEChERS technique for residue analysis.
Additionally, the use of the QuEChERS method in this study aligns with findings from another study that developed a modified QuEChERS method for determining organophosphate and organochlorine pesticide residues in fruits and vegetables[3]. This method proved to be effective and cost-efficient, emphasizing the potential of QuEChERS in multi-residue pesticide analysis. The current study's use of LC-MS/MS also addresses concerns about matrix effects in food analysis, which can lead to errors in quantification. Previous research demonstrated that sample dilution could mitigate these effects, allowing for more accurate pesticide residue analysis[4].
In conclusion, the study by Dr. YS Parmar University of Horticulture and Forestry provides significant insights into the safe use of insecticides in broccoli. By validating the QuEChERS method and demonstrating no appreciable dietary risk, the research offers valuable guidelines for regulatory authorities to ensure the safety of broccoli consumption. This study not only confirms the efficacy of the QuEChERS method but also contributes to the broader understanding of pesticide residue behavior in food crops, building on and refining previous research in this field.
VegetablesAgricultureHealth
References
Main Study
1) Method validation, residue behaviour and dietary risk assessment of insecticides (cyantraniliprole, acetamiprid, flubendiamide and its metabolite, des-iodo flubendiamide) in or on broccoli using LC-MS/MS.
Published 16th July, 2024
https://doi.org/10.1002/bmc.5962
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