The US Environmental Protection Agency (US EPA) has registered with the US Federal register under the Federal Food, Drug, and Cosmetic Act (FFDCA) to publish MRLs for Thiamethoxam in pineapple. The regulation became effective on June 15, 2022.
Pesticides are chemical substances intended for preventing, destroying, or controlling weeds, molds and pests. Thiamethoxam is a second generation neonicotinoid insecticide which offers effective broad-spectrum pest protection on numerous crops around the world. However, pesticide residues can cause several human health problems, such as cancer, neurological disorders and impairment of the immune system. Therefore, the concentration of pesticide residues in food products must be monitored in order to ensure they are below Maximum Residue Limits (MRLs).
To comply with US regulation, the US EPA proposed MRLs are being registered within the US Federal register under the FFDCA for use in the USA in or on pineapple and process residue. Evaluation of these thiamethoxam applications indicated human health and environmental risks. Details regarding these applications can be found in 40 CFR Part 180 and the MRLs were adopted on June 15, 2022. 
In making its tolerance decisions, the US EPA seeks to harmonize US tolerances with international standards. However, in some countries tolerances are called Maximum Residue Limits (MRLs).
Therefore, MRLs established for residues of thiamethoxam in pineapple and process residue are summarized in Table 1.
Table 1: Proposed Maximum Residue Limits for thiamethoxam.
|Common Name||Residue Definition||
(CAS # 153719-23-4)
|Pineapple, process residue||
*PPM = parts per million
For pesticide analysis in various food commodities, the Quick, Easy, Cheap, Effective, Rugged, and Safe (QuEChERS) is an extraction and clean-up technique. The international methods widely used for pesticides analysis are BS EN and AOAC. They are extracted by acetonitrile and analyzed by either liquid or gas chromatography coupled with tandem mass spectrometry (LC-MS/MS or GC-MS/MS) depending upon its chemical properties.
What does the change mean?
This update has the potential to affect agricultural producers, food manufacturers and pesticide manufacturers. Food products destined for the USA, if listed in Table 1, must not have residues of thiamethoxam exceeding the MRLs. Complying with food safety regulations can be a complex, time-consuming and expensive process. Food producers should seek professional advice.
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THE REGULATION WILL BE IN FORCE ON JUNE 15, 2022
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